Configuring Layer 2 Multicast

2018-03-22

: Tp-Link Configuring Layer 2 Multicast configuring_layer_2_multicast configurationguide

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Configuring Layer 2 Multicast
CHAPTERS
1. Layer 2 Multicast

2. IGMP Snooping Configuration
3. MLD Snooping Configuration
4. MVR Configuration

5. Multicast Filtering Configuration

6. Viewing Multicast Snooping Information
7. Configuration Examples

8. Appendix: Default Parameters

Configuring Layer 2 Multicast

Layer 2 Multicast

This guide applies to:

T1500G-10PS v2 or above, T1500G-8T v2 or above, T1500G-10MPS v2 or above, T1500-28PCT v3 or above,
T1600G-52TS v3 or above, T1600G-52PS v3 or above, T1600G-28PS v3 or above, T1600G-28TS v3 or
above, T1600G-18TS v2 or above, T2600G-52TS v3 or above, T2600G-28TS v3 or above, T2600G-28MPS
v3 or above, T2600G-28SQ v1 or above.

Layer 2 Multicast

1.1

Overview
In a point-to-multipoint network, packets can be sent in three ways: unicast, broadcast
and multicast. With unicast, many copies of the same information will be sent to all the
receivers, occupying a large bandwidth.
With broadcast, information will be sent to all users in the network no matter they need it or
not, wasting network resources and impacting information security.
Multicast, however, solves all the problems caused by unicast and broadcast. With
multicast, the source only need to send one piece of information, and all and only the users
who need the information will receive copies of the information. In a point-to-multipoint
network, multicast technology not only transmits data with high efficiency, but also saves a
large bandwidth and reduces network load.
In practical applications, Internet information provider can provide value-added services
such as Online Live, IPTV, Distance Education, Telemedicine, Internet Radio and Real-time
Video Conferences more conveniently using multicast.
Layer 2 Multicast allows Layer 2 switches to listen for IGMP (Internet Group Management
Protocol) packets between IGMP Querier and user hosts to establish multicast forwarding
table and to manage and control transmission of packets.
Take IGMP Snooping as an example. When IGMP Snooping is disabled on the Layer 2
device, multicast packets will be broadcast in the Layer 2 network; when IGMP Snooping
is enabled on the Layer 2 device, multicast data from a known multicast group will be
transmitted to the designated receivers instead of being broadcast in the Layer 2 network.

Configuration Guide

Configuring Layer 2 Multicast

Layer 2 Multicast

Demonstrated as below:
Figure 1-1

IGMP Snooping
Multicast packets transmission
without IGMP Snooping

Multicast packets transmission
with IGMP Snooping
IGMP Querier

IGMP Querier
Source

Source

Router Port

Snooping Switch

Non-Snooping Switch
Member Port

Host A
Receiver

Host B

Host C
Receiver

Host A
Receiver

Member Port

Host B

Host C
Receiver

Multicast packets

The following basic concepts of IGMP Snooping will be introduced: IGMP querier, snooping
switch, router port and member port.

IGMP Querier

An IGMP querier is a multicast router (a router or a Layer 3 switch) that sends query
messages to maintain a list of multicast group memberships for each attached network,
and a timer for each membership.
Normally only one device acts as querier per physical network. If there are more than
one multicast router in the network, a querier election process will be implemented to
determine which one acts as the querier.

Snooping Switch

A snooping switch indicates a switch with IGMP Snooping enabled. The switch maintains a
multicast forwarding table by snooping on the IGMP transmissions between the host and
the querier. With the multicast forwarding table, the switch can forward multicast data only
to the ports that are in the corresponding multicast group, so as to constrain the flooding
of multicast data in the Layer 2 network.

Router Port

A router port is a port on snooping switch that is connecting to the IGMP querier.

Configuration Guide

Configuring Layer 2 Multicast

Layer 2 Multicast

Member Port

A member port is a port on snooping switch that is connecting to the host.

1.2

Supported Features
Layer 2 Multicast protocol for IPv4: IGMP Snooping

On the Layer 2 device, IGMP Snooping transmits data on demand on data link layer by
analyzing IGMP packets between the IGMP querier and the users, to build and maintain
Layer 2 multicast forwarding table.

Layer 2 Multicast protocol for IPv6: MLD Snooping

On the Layer 2 device, MLD Snooping (Multicast Listener Discovery Snooping) transmits
data on demand on data link layer by analyzing MLD packets between the MLD querier and
the users, to build and maintain Layer 2 multicast forwarding table.

Multicast VLAN Registration (MVR)

MVR allows a single multicast VLAN to be shared for multicast member ports in different
VLANs in IPv4 network. In IGMP Snooping, if member ports are in different VLANs, a copy
of the multicast streams is sent to each VLAN that has member ports. While MVR provides
a dedicated multicast VLAN to forward multicast traffic over the Layer 2 network, to avoid
duplication of multicast streams for clients in different VLANs. Clients can dynamically join
or leave the multicast VLAN without interfering with their relationships in other VLANs.
There are two types of MVR modes:
 Compatible Mode

In compatible mode, the MVR switch does not forward report or leave messages from
the hosts to the IGMP querier. So the IGMP querier cannot learn the multicast groups
membership information from the MVR switch. You have to statically configure the IGMP
querier to transmit all the required multicast streams to the MVR switch via the multicast
VLAN.
 Dynamic Mode

In dynamic mode, after receiving report or leave messages from the hosts, the MVR switch
will forward them to the IGMP querier via the multicast VLAN (with appropriate translation of
the VLAN ID). So the IGMP querier can learn the multicast groups membership information
through the report and leave messages, and transmit the multicast streams to the MVR
switch via the multicast VLAN according to the multicast forwarding table.

Multicast Filtering

Multicast Filtering allows you to control the set of multicast groups to which a host can
belong. You can filter multicast joins on a per-port basis by configuring IP multicast profiles
(IGMP profiles or MLD profiles) and associating them with individual switch ports.

Configuration Guide

Configuring Layer 2 Multicast

IGMP Snooping Configuration

IGMP Snooping Configuration
To complete IGMP Snooping configuration, follow these steps:

1) Enable IGMP Snooping globally and configure the global parameters.
2) Configure IGMP Snooping for VLANs.
3) Configure IGMP Snooping for ports.

4) (Optional) Configure the advanced IGMP Snooping features:
 Configure hosts to statically join a group.

 Configure IGMP accounting and authentication features.
Note:

IGMP Snooping takes effect only when it is enabled globally, in the corresponding VLAN and port at
the same time.

2.1

Using the GUI

2.1.1 Configuring IGMP Snooping Globally
Choose the menu L2 FEATURES > Multicast > IGMP Snooping > Global Config to load the
following page.
Figure 2-1

Configure IGMP Snooping Globally

Follow these steps to configure IGMP Snooping globally:

1) In the Global Config section, enable IGMP Snooping globally and configure the global
parameters.
IGMP Snooping

Enable or disable IGMP Snooping globally.

Configuration Guide

Configuring Layer 2 Multicast

IGMP Version

IGMP Snooping Configuration

Specify the IGMP version.
v1: The switch works as an IGMPv1 Snooping switch. It can only process
IGMPv1 messages from the host. Messages of other versions are ignored.
v2: The switch works as an IGMPv2 Snooping switch. It can process both
IGMPv1 and IGMPv2 messages from the host. IGMPv3 messages are ignored.
v3: The switch works as an IGMPv3 Snooping switch. It can process IGMPv1,
IGMPv2 and IGMPv3 messages from the host.

Unknown
Multicast Groups

Set the way in which the switch processes data that are sent to unknown
multicast groups as Forward or Discard. By default, it is Forward.
Unknown multicast groups are multicast groups that do not match any of the
groups announced in earlier IGMP membership reports, and thus cannot be
found in the multicast forwarding table of the switch.

Note: IGMP Snooping and MLD Snooping share the setting of Unknown
Multicast Groups, so you have to enable MLD Snooping globally on the L2
FEATURES > Multicast > MLD Snooping > Global Config page at the same
time.
Header Validation

Enable or disable Header Validation. By default, it is disabled.
Generally, for IGMP packets, the TTL value should be 1, ToS field should be
0xC0, and Router Alert option should be 0x94040000. The fields to be validated
depend on the IGMP version being used. IGMPv1 only checks the TTL field.
IGMPv2 checks the TTL field and the Router Alert option. IGMPv3 checks TTL
field, ToS field and Router Alert option. Packets that fail the validation process
will be dropped.

2) Click Apply.

2.1.2 Configuring IGMP Snooping for VLANs
Before configuring IGMP Snooping for VLANs, set up the VLANs that the router ports and
the member ports are in. For details, please refer to Configuring 802.1Q VLAN.
The switch supports configuring IGMP Snooping on a per-VLAN basis. After IGMP
Snooping is enabled globally, you also need to enable IGMP Snooping and configure the
corresponding parameters for the VLANs that the router ports and the member ports are
in.
Choose the menu L2 FEATURES > Multicast > IGMP Snooping > Global Config, and click
in your desired VLAN entry in the IGMP VLAN Config section to load the following page.

Configuration Guide

Configuring Layer 2 Multicast

Figure 2-2

IGMP Snooping Configuration

Configure IGMP Snooping for VLAN

Follow these steps to configure IGMP Snooping for a specific VLAN:

1) Enable IGMP Snooping for the VLAN, and configure the corresponding parameters.
VLAN ID

Displays the VLAN ID.

IGMP Snooping
Status

Enable or disable IGMP Snooping for the VLAN.

Configuration Guide

Configuring Layer 2 Multicast

Fast Leave

IGMP Snooping Configuration

Enable or disable Fast Leave for the VLAN. IGMPv1 does not support Fast Leave.
Without Fast Leave, after a receiver sends an IGMP leave message to leave a
multicast group, the switch will forward the leave message to the Layer 3 device
(the querier).
From the point of view of the querier, the port connecting to the switch is a
member port of the corresponding multicast group. After receiving the leave
message from the switch, the querier will send out a configured number (Last
Member Query Count) of group-specific queries on that port with a configured
interval (Last Member Query Interval), and wait for IGMP group membership
reports. If there are other receivers connecting to the switch, they will response
to the queries before the Last Member Query Interval expires. If no reports are
received after the response time of the last query expires, the querier will remove
the port from the forwarding list of the corresponding multicast group.
That is, if there are other receivers connecting to the switch, the one sent leave
message have to wait until the port ages out from the switch’s forwarding list of
the corresponding multicast group (the maximum waiting time is decided by the
Member Port Aging Time).
With Fast Leave enabled on a VLAN, the switch will remove the (Multicast Group,
Port, VLAN) entry from the multicast forwarding table before forwarding the leave
message to the querier. This helps to reduce bandwidth waste since the switch
no longer sends the corresponding multicast streams to the VLAN of the port as
soon as the port receives a leave message from the VLAN.

Report
Suppression

Enable or disable Report Suppression for the VLAN.

Member Port
Aging Time

Specify the aging time of the member ports in the VLAN.

When enabled, the switch will only forward the first IGMP report message for
each multicast group to the IGMP querier and suppress subsequent IGMP report
messages for the same multicast group during one query interval. This feature
prevents duplicate report messages from being sent to the IGMP querier.

Once the switch receives an IGMP membership report message from a port,
the switch adds this port to the member port list of the corresponding multicast
group. Member ports that are learned in this way are called dynamic member
ports.
If the switch does not receive any IGMP membership report messages for a
specific multicast group from a dynamic member port, it will no longer consider
this port as a member port of this multicast group and delete it from the multicast
forwarding table.

Router Port
Aging Time

Specify the aging time of the router ports in the VLAN.
Once the switch receives an IGMP general query message from a port, the switch
adds this port to the router port list. Router ports that are learned in this way are
called dynamic router ports.
If the switch does not receive any IGMP general query message from a dynamic
router port within the router port aging time, the switch will no longer consider this
port as a router port and delete it from the router port list.

Configuration Guide

Configuring Layer 2 Multicast

Leave Time

IGMP Snooping Configuration

Specify the leave time for the VLAN.
When the switch receives a leave message from a port to leave a multicast group,
it will wait for a leave time before removing the port from the multicast group.
During the period, if the switch receives any report messages from the port, the
port will not be removed from the multicast group. Exceptions are as follows:

•

If the member port ages out before the Leave Time ends and no report
messages are received, the port will be removed from the multicast group
once its Member Port Aging Time ends.

•

The Leave Time mechanism will not take effect when Fast Leave takes effect.

A proper leave time value can avoid other hosts connecting to the same port of
the switch being mistakenly removed from the multicast group when only some of
them want to leave.
IGMP Snooping
Querier

Enable or disable the IGMP Snooping Querier for the VLAN.
When enabled, the switch acts as an IGMP Snooping Querier for the hosts in
this VLAN. A querier periodically sends a general query on the network to solicit
membership information, and sends group-specific queries when it receives leave
messages from hosts.

Note:
To enable IGMP Snooping Querier for a VLAN, IGMP Snooping should be enabled
both globally and in the VLAN.
Query Interval

With IGMP Snooping Querier enabled, specify the interval between general query
messages sent by the switch.

Maximum
Response Time

With IGMP Snooping Querier enabled, specify the host’s maximum response time
to general query messages.

Last Member
Query Interval

With IGMP Snooping Querier enabled, when the switch receives an IGMP leave
message, it obtains the address of the multicast group that the host wants to
leave from the message. Then the switch sends out group-specific queries to this
multicast group through the port receiving the leave message. This parameter
determines the interval between group-specific queries.

Last Member
Query Count

With IGMP Snooping Querier enabled, specify the number of group-specific
queries to be sent. If specified count of group-specific queries are sent and no
report message is received, the switch will delete the multicast address from the
multicast forwarding table.

General Query
Source IP

With IGMP Snooping Querier enabled, specify the source IP address of the
general query messages sent by the switch. It should be a unicast address.

Static Router
Ports

Select one or more ports to be the static router ports in the VLAN. Static router
ports do not age.
Multicast streams and IGMP packets to all groups in this VLAN will be forwarded
through the static router ports. Multicast streams and IGMP packets to the groups
that have dynamic router ports will be also forwarded through the corresponding
dynamic router ports.

Configuration Guide

Configuring Layer 2 Multicast

Forbidden
Router Ports

IGMP Snooping Configuration

Select ports to forbid them from being router ports in the VLAN.

2) Click Save.

2.1.3 Configuring IGMP Snooping for Ports
Choose the menu L2 FEATURES > Multicast > IGMP Snooping > Port Config� to load the
following page.
Figure 2-3

Configure IGMP Snooping for Ports

Follow these steps to configure IGMP Snooping for ports:

1) Enable IGMP Snooping for the port and enable Fast Leave if there is only one receiver
connected to the port.
IGMP Snooping

Enable or disable IGMP Snooping for the port.

Fast Leave

Enable or disable Fast Leave for the port. IGMPv1 does not support fast leave.
Fast Leave can be enabled on a per-port basis or per-VLAN basis. When enabled
on a per-port basis, the switch will remove the port from the corresponding
multicast group of all VLANs before forwarding the leave message to the querier.
You should only use Fast Leave for a port when there is a single receiver
connected to the port. For more details about Fast Leave, see 2.1.2 Configuring
IGMP Snooping for VLANs.

LAG

Displays the LAG the port belongs to.

2) Click Apply.

Configuration Guide

Configuring Layer 2 Multicast

IGMP Snooping Configuration

2.1.4 Configuring Hosts to Statically Join a Group
Hosts or Layer 2 ports normally join multicast groups dynamically, but you can also
configure hosts to statically join a group.
Choose the menu L2 FEATURES > Multicast > IGMP Snooping > Static Group Config and
to load the following page.

click

Figure 2-4

Configure Hosts to Statically Join a Group

Follow these steps to configure hosts to statically join a group:

1) Specify the multicast IP address, VLAN ID. Select the ports to be the static member
ports of the multicast group.
Multicast IP

Specify the address of the multicast group that the hosts need to join.

VLAN ID

Specify the VLAN that the hosts are in.

Member Ports

Select the ports that the hosts are connected to. These ports will become the
static member ports of the multicast group and will never age.

2) Click Create.

2.1.5 Configuring IGMP Accounting and Authentication Features
Note:

Only T2600G series switches support this feature.

You can enable IGMP accounting and authentication according to your need. IGMP
accounting is configured globally, and IGMP authentication can be enabled on a per-port
basis.

Configuration Guide

Configuring Layer 2 Multicast

IGMP Snooping Configuration

To use these features, you should also set up a RADIUS server and go to SECURITY > AAA
> RADIUS Config to configure RADIUS server for the switch.
Choose the menu L2 FEATURES > Multicast > IGMP Snooping > IGMP Authentication to
load the following page.
Figure 2-5

Configure IGMP Accounting and Authentication

Follow these steps to enable IGMP accounting:

1) In the Global Config section, enable IGMP Accounting globally.
Accounting

Enable or disable IGMP Accounting.

2) Click Apply.
Follow these steps to configure IGMP Authentication on ports:

1) In the Port Config section, select the ports and enable IGMP Authentication.
IGMP
Authentication

Enable or disable IGMP Authentication for the port.

2) Click Apply.

Configuration Guide

Configuring Layer 2 Multicast

2.2

IGMP Snooping Configuration

Using the CLI

2.2.1 Configuring IGMP Snooping Globally
Follow these steps to configure IGMP Snooping globally:
Step 1

configure

Step 2

ip igmp snooping

Step 3

ip igmp snooping version {v1 | v2 | v3}

Enter global configuration mode.

Enable IGMP Snooping Globally.

Configure the IGMP version.

v1:The switch works as an IGMPv1 Snooping switch. It can only process IGMPv1 report
messages from the host. Report messages of other versions are ignored.
v2: The switch works as an IGMPv2 Snooping switch. It can process both IGMPv1 and IGMPv2
report messages from the host. IGMPv3 report messages are ignored.
v3: The switch works as an IGMPv3 Snooping switch. It can process IGMPv1, IGMPv2 and
IGMPv3 report messages from the host.
Step 4

ip igmp snooping drop-unknown

(Optional) Configure the way how the switch processes multicast streams that are sent to
unknown multicast groups as Discard. By default, it is Forward.
Unknown multicast groups are multicast groups that do not match any of the groups
announced in earlier IGMP membership reports, and thus cannot be found in the multicast
forwarding table of the switch.

Note: IGMP Snooping and MLD Snooping share the setting of Unknown Multicast Groups, you
need to ensure MLD Snooping is enabled globally. To enable MLD Snooping globally, use the
ipv6 mld snooping command in global configuration mode.
Step 5

ip igmp snooping header-validation
(Optional) Enable header validation.

Generally, for IGMP packets, the TTL value should be 1, ToS field should be 0xC0, and Router
Alert option should be 0x94040000. The fields validated depend on the IGMP version being
used. IGMPv1 only checks the TTL field. IGMPv2 checks the TTL field and the Router Alert
option. IGMPv3 checks TTL field, ToS field and Router Alert option. Packets that fail the
validation process will be dropped.
Step 6

show ip igmp snooping

Step 7

end

Step 8

copy running-config startup-config

Show the basic IGMP Snooping configuration.

Return to privileged EXEC mode.

Save the settings in the configuration file.

Configuration Guide

Configuring Layer 2 Multicast

IGMP Snooping Configuration

The following example shows how to enable IGMP Snooping and header validation globally,
and specify the IGMP Snooping version as IGMPv3, the way how the switch processes
multicast streams that are sent to unknown multicast groups as discard.
Switch#configure
Switch(config)#ip igmp snooping
Switch(config)#ip igmp snooping version v3
Switch(config)#ipv6 mld snooping
Switch(config)#ip igmp snooping drop-unknown
Switch(config)#ip igmp snooping header-validation
Switch(config)#show ip igmp snooping
IGMP Snooping

:Enable

IGMP Version

:V3

Unknown Multicast

:Discard

Header Validation

:Enable

...
Switch(config)#end
Switch#copy running-config startup-config

2.2.2 Configuring IGMP Snooping for VLANs
Before configuring IGMP Snooping for VLANs, set up the VLANs that the router ports and
the member ports are in. For details, please refer to Configuring 802.1Q VLAN.
The switch supports configuring IGMP Snooping on a per-VLAN basis. After IGMP
Snooping is enabled globally, you also need to enable IGMP Snooping and configure the
corresponding parameters for the VLANs that the router ports and the member ports are
in.
Follow these steps to configure IGMP Snooping for VLANs:
Step 1

configure

Enter global configuration mode.

Configuration Guide

Configuring Layer 2 Multicast

Step 2

IGMP Snooping Configuration

ip igmp snooping vlan-config vlan-id-list mtime member-time

Enable IGMP Snooping for the specified VLANs, and specify the member port aging time for
the VLANs.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).

member-time: Specify the aging time of the member ports in the specified VLANs. Valid values
are from 60 to 600 seconds. By default, it is 260 seconds.

Once the switch receives an IGMP membership report message from a port, the switch adds
this port to the member port list of the corresponding multicast group. Member ports that are
learned in this way are called dynamic member ports.
If the switch does not receive any IGMP membership report message for a specific multicast
group from a dynamic member port, it will no longer consider this port as a member port of this
multicast group and delete it from the multicast forwarding table.

Step 3

ip igmp snooping vlan-config vlan-id-list rtime router-time

Specify the router port aging time for the VLANs.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).

router-time: Specify the aging time of the router ports in the specified VLANs. Valid values are
from 60 to 600 seconds. By default, it is 300 seconds.

Once the switch receives an IGMP general query message from a port, the switch adds this
port to the router port list. Router ports that are learned in this way are called dynamic router
ports.
If the switch does not receive any IGMP general query message from a dynamic router port
within the router port aging time, the switch will no longer consider this port as a router port
and delete it from the router port list.

Step 4

ip igmp snooping vlan-config vlan-id-list ltime leave-time

Specify the router port aging time for the VLANs.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).

leave-time: Specify the leave time for the VLAN(s). Valid values are from 1 to 30 in seconds,
and the default value is 1 second.

When the switch receives a leave message from a port to leave a multicast group, it will wait for
a leave time before removing the port from the multicast group. During the period, if the switch
receives any report messages from the port, the port will not be removed from the multicast
group. Exceptions are as follows:

•

If the member port ages out before the Leave Time ends and no report messages are
received, the port will be removed from the multicast group once its Member Port Aging
Time ends.

•

The Leave Time mechanism will not take effect when Fast Leave takes effect.

A proper leave time value can avoid other hosts connecting to the same port of the switch
being mistakenly removed from the multicast group when only some of them want to leave.

Configuration Guide

Configuring Layer 2 Multicast

Step 5

IGMP Snooping Configuration

ip igmp snooping vlan-config vlan-id-list report-suppression

(Optional) Enable the Report Suppression for the VLANs. By default, it is disabled.

When enabled, the switch will only forward the first IGMP report message for each multicast
group to the IGMP querier and suppress subsequent IGMP report messages for the same
multicast group during one query interval. This feature prevents duplicate report messages
from being sent to the IGMP querier.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).
Step 6

ip igmp snooping vlan-config vlan-id-list immediate-leave

(Optional) Enable the Fast Leave for the VLANs. By default, it is disabled. IGMPv1 does not
support fast leave.
Without Fast Leave, after a receiver sends an IGMP leave message to leave a multicast group,
the switch will forward the leave message to the Layer 3 device (the querier).
From the point of view of the querier, the port connecting to the switch is a member port of the
corresponding multicast group. After receiving the leave message from the switch, the querier
will send out a configured number (Last Member Query Count) of group-specific queries on
that port with a configured interval (Last Member Query Interval), and wait for IGMP group
membership reports. If there are other receivers connecting to the switch, they will response
to the queries before the Last Member Query Interval expires. If no reports are received
after the response time of the last query expires, the querier will remove the port from the
forwarding list of the corresponding multicast group.
That is, if there are other receivers connecting to the switch, the one sent leave message have
to wait until the port ages out from the switch’s forwarding list of the corresponding multicast
group (the maximum waiting time is decided by the Member Port Aging Time).
With Fast Leave enabled on a VLAN, the switch will remove the (Multicast Group, Port, VLAN)
entry from the multicast forwarding table before forwarding the leave message to the querier.
This helps to reduce bandwidth waste since the switch no longer sends the corresponding
multicast streams to the VLAN of the port as soon as the port receives a leave message from
the VLAN.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).
Step 7

ip igmp snooping vlan-config vlan-id-list rport interface { fastEthernet port-list |
gigabitEthernet port-list | ten-gigabitEthernet port-list | port-channel lag-list }

(Optional) Specify the static router ports for the VLANs. Static router ports do not age.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).

port-list : The number or the list of the Ethernet port that need to be configured as static router
ports.
lag-list : The ID or the list of the LAG that need to be configured as static router ports.
Step 8

ip igmp snooping vlan-config vlan-id-list router-ports-forbidden interface { fastEthernet
port-list | gigabitEthernet port-list | ten-gigabitEthernet port-list | port-channel lag-list }
(Optional) Specify the ports to forbid them from being router ports in the VLANs.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).

port-list : The number or the list of the Ethernet port that need to be forbidden from being router
ports.
lag-list : The ID or the list of the LAG that need to be forbidden from being router ports.

Configuration Guide

Configuring Layer 2 Multicast

Step 9

IGMP Snooping Configuration

ip igmp snooping vlan-config vlan-id-list querier

(Optional) Enable the IGMP Snooping Querier for the VLAN. By default, it is disabled.

When enabled, the switch acts as an IGMP Snooping Querier for the hosts in this VLAN. A
querier periodically sends a general query on the network to solicit membership information,
and sends group-specific queries when it receives leave messages from hosts.

Note:
To enable IGMP Snooping Querier for a VLAN, IGMP Snooping should be enabled both globally
and in the VLAN.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).
After enabling IGMP Snooping Querier feature, you need to specify the corresponding
parameters including the Last Member Query Count, Last Member Query Interval, Maximum
Response Time, Query Interval and General Query Source IP. Use the command below in global
configuration mode to configure the parameters:
ip igmp snooping vlan-config vlan-id-list querier { max-response-time response-time | queryinterval interval | general-query source-ip ip-addr | last-member-query-count num | lastmember-query-interval interval }

vlan-id-list: Specify the ID or the ID list of the VLAN(s).

response-time: Specify the host’s maximum response time to general query messages. Valid
values are from 1 to 25 seconds, and the default value is 10 seconds.
query-interval interval: Specify the interval between general query messages sent by the
switch. Valid values are from 10 to 300 seconds, and the default value is 60 seconds.

ip-addr: Specify the source IP address of the general query messages sent by the switch. It
should be a unicast address. By default, it is 0.0.0.0.

num: Specify the number of group-specific queries to be sent. With IGMP Snooping Querier
enabled, when the switch receives an IGMP leave message, it obtains the address of the
multicast group that the host wants to leave from the message. Then the switch sends out
group-specific queries to this multicast group through the port receiving the leave message.
If specified count of group-specific queries are sent and no report message is received, the
switch will delete the multicast address from the multicast forwarding table. Valid values are
from 1 to 5, and the default value is 2.
last-member-query-interval interval: Specify the interval between group-specific queries.
Valid values are from 1 to 5 seconds, and the default value is 1 second.

Step 10

show ip igmp snooping vlan vlan-id

Show the basic IGMP Snooping configuration in the specified VLAN.

Step 11

end

Step 12

copy running-config startup-config

Return to privileged EXEC mode.

Save the settings in the configuration file.

The following example shows how to enable IGMP Snooping for VLAN 1, and configure the
member port aging time as 300 seconds, the router port aging time as 320 seconds, and
then enable Fast Leave and Report Suppression for the VLAN:

Configuration Guide

Configuring Layer 2 Multicast

IGMP Snooping Configuration

Switch#configure
Switch(config)#ip igmp snooping vlan-config 1 mtime 300
Switch(config)#ip igmp snooping vlan-config 1 rtime 320
Switch(config)#ip igmp snooping vlan-config 1 immediate-leave
Switch(config)#ip igmp snooping vlan-config 1 report-suppression
Switch(config)#show ip igmp snooping vlan 1
Vlan Id: 1
Vlan IGMP Snooping Status: Enable
Fast Leave: Enable
Report Suppression: Enable
Router Time:320
Member Time: 300
Querier: Disable
...
Switch(config)#end
Switch#copy running-config startup-config
The following example shows how to enable IGMP Snooping querier for VLAN 1, and
configure the query interval as 100 seconds, the maximum response time as 15 seconds,
the last member query interval as 2 seconds, the last member query count as 3, and the
general query source IP as 192.168.0.5:
Switch#configure
Switch(config)#ip igmp snooping vlan-config 1 querier
Switch(config)#ip igmp snooping vlan-config 1 querier query-interval 100
Switch(config)#ip igmp snooping vlan-config 1 querier max-response-time 15
Switch(config)#ip igmp snooping vlan-config 1 querier last-member-query-interval 2
Switch(config)#ip igmp snooping vlan-config 1 querier last-member-query-count 3
Switch(config)#ip igmp snooping vlan-config 1 querier general-query sourceip192.168.0.5
Switch(config)#show ip igmp snooping vlan 1
Vlan Id: 1
...
Querier:
Configuration Guide

Configuring Layer 2 Multicast

IGMP Snooping Configuration

Maximum Response Time:

Query Interval:

100

Last Member Query Interval: 2
Last Member Query Count:

General Query Source IP:

192.168.0.5

...
Switch(config)#end
Switch#copy running-config startup-config

2.2.3 Configuring IGMP Snooping for Ports
Follow these steps to configure IGMP Snooping for ports:
Step 1

configure

Step 2

interface {fastEthernet port | range fastEthernet port-list | gigabitEthernet port | range
gigabitEthernet port-list | ten-gigabitEthernet port | range ten-gigabitEthernet port-list | portchannel port-channel-id | range port-channel port-channel-list }

Enter global configuration mode.

Enter interface configuration mode.

Step 3

ip igmp snooping

Step 4

ip igmp snooping immediate-leave

Enable IGMP Snooping for the port. By default, it is enabled.

(Optional) Enable Fast Leave on the specified port.

Fast Leave can be enabled on a per-port basis or per-VLAN basis. When enabled on a per-port
basis, the switch will remove the port from the corresponding multicast group of all VLANs
before forwarding the leave message to the querier.
You should only use Fast Leave for a port when there is a single receiver connected to the
port. For more details about Fast Leave, see 2.2.2 Configuring IGMP Snooping for VLANs.
Step 5

show ip igmp snooping interface [fastEthernet [ port-list ] | gigabitEthernet [ port-list ] | tengigabitEthernet [ port-list ] | port-channel [port-channel-list ] ] basic-config

Show the basic IGMP Snooping configuration on the specified port(s) or of all the ports.
Step 6

end

Step 7

copy running-config startup-config

Return to privileged EXEC mode.

Save the settings in the configuration file.

Configuration Guide

Configuring Layer 2 Multicast

IGMP Snooping Configuration

The following example shows how to enable IGMP Snooping and fast leave for port 1/0/13:
Switch#configure
Switch(config)#interface range gigabitEhternet 1/0/1-3
Switch(config-if-range)#ip igmp snooping
Switch(config-if-range)#ip igmp snooping immediate-leave
Switch(config-if-range)#show ip igmp snooping interface gigabitEthernet 1/0/1-3
Port

IGMP-Snooping

Fast-Leave

-----------

-------------------

--------------

Gi1/0/1

enable

Gi1/0/2

enable

Gi1/0/3

enable

Switch(config-if-range)#end
Switch#copy running-config startup-config

2.2.4 Configuring Hosts to Statically Join a Group
Hosts or Layer 2 ports normally join multicast groups dynamically, but you can also
configure hosts to statically join a group.
Follow these steps to configure hosts to statically join a group:
Step 1

configure

Step 2

ip igmp snooping vlan-config vlan-id-list static ip interface { fastEthernet port-list |
gigabitEthernet port-list | ten-gigabitEthernet port-list | port-channel lag-list }

Enter global configuration mode.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).

ip: Specify the IP address of the multicast group that the hosts want to join.

port-list / lag-list: Specify the ports that is connected to the hosts. These ports will become
static member ports of the group.
Step 3

show ip igmp snooping groups static

Step 4

end

Show the static MLD Snooping configuration.

Return to privileged EXEC mode.

Configuration Guide

Configuring Layer 2 Multicast

Step 5

IGMP Snooping Configuration

copy running-config startup-config

Save the settings in the configuration file.

The following example shows how to configure port 1/0/1-3 in VLAN 2 to statically join the
multicast group 239.1.2.3:
Switch#configure
Switch(config)#ip igmp snooping vlan-config 2 static 239.1.2.3 interface
gigabitEthernet 1/0/1-3
Switch(config)#show ip igmp snooping groups static
Multicast-ip

VLAN-id

Addr-type

Switch-port

------------

-------

---------

-----------

239.1.2.3

static

Gi1/0/1-3

Switch(config)#end
Switch#copy running-config startup-config

2.2.5 Configuring IGMP Accounting and Authentication Features
Note:

Only T2600G series switches support this feature.

You can enable IGMP accounting and authentication according to your need. IGMP
accounting is configured globally, and IGMP authentication can be enabled on a per-port
basis.
To use these features, you need to set up a RADIUS server and configure add the RADIUS
server for the switch.
Follow these steps to add the RADIUS server and enable IGMP accounting globally:
Step 1

configure

Enter global configuration mode.

Configuration Guide

Configuring Layer 2 Multicast

Step 2

IGMP Snooping Configuration

radius-server host ip-address [ auth-port port-id ] [ acct-port port-id ] [ timeout time ] [
retransmit number ] [ nas-id nas-id ] key { [ 0 ] string | 7 encrypted-string }

Add the RADIUS server and configure the related parameters as needed.

host ip-address: Enter the IP address of the server running the RADIUS protocol.
auth-port port-id: Specify the UDP destination port on the RADIUS server for authentication
requests. The default setting is 1812.
acct-port port-id: Specify the UDP destination port on the RADIUS server for accounting
requests. The default setting is 1813. Usually, it is used in the 802.1X feature.
timeout time: Specify the time interval that the switch waits for the server to reply before
resending. The valid values are from 1 to 9 seconds and the default setting is 5 seconds.
retransmit number: Specify the number of times a request is resent to the server if the server
does not respond. The valid values are from 1 to 3 and the default setting is 2.
nas-id nas-id: Specify the name of the NAS (Network Access Server) to be contained in
RADIUS packets for identification. It ranges from 1 to 31 characters. The default value is the
MAC address of the switch. Generally, the NAS indicates the switch itself.
key { [ 0 ] string | 7 encrypted-string }: Specify the shared key. 0 and 7 represent the encryption
type. 0 indicates that an unencrypted key will follow. 7 indicates that a symmetric encrypted
key with a fixed length will follow. By default, the encryption type is 0. string is the shared key
for the switch and the server, which contains 31 characters at most. encrypted-string is a
symmetric encrypted key with a fixed length, which you can copy from the configuration file of
another switch. The key or encrypted-key you configure here will be displayed in the encrypted
form.
Step 3

ip igmp snooping accouting

Step 4

show ip igmp snooping

Step 5

end

Step 6

copy running-config startup-config

Enable IGMP accounting globally.

Show the basic IGMP Snooping configuration.

Return to privileged EXEC mode.

Save the settings in the configuration file.

Follow these steps to enable IGMP authentication for ports:
Step 1

configure

Step 2

Enter global configuration mode.

Enter interface configuration mode.

Configuration Guide

Configuring Layer 2 Multicast

IGMP Snooping Configuration

Step 3

ip igmp snooping authentication

Step 4

show ip igmp snooping interface [fastEthernet [ port-list ] | gigabitEthernet [ port-list ] | tengigabitEthernet [ port-list ] | port-channel [port-channel-list ] ] authentication

Enable IGMP Snooping authentication for the port. By default, it is enabled.

Show the basic IGMP Snooping configuration on the specified port(s) or of all the ports.
Step 5

end

Step 6

copy running-config startup-config

Return to privileged EXEC mode.

Save the settings in the configuration file.

The following example shows how to enable IGMP accounting globally:
Switch#configure
Switch(config)#ip igmp snooping accounting
Switch(config)#show ip igmp snooping
...
Global Authentication Accounting: Enable
Enable Port: Gi1/0/1-28, Po1-14
Enable VLAN:
Switch(config)#end
Switch#copy running-config startup-config
The following example shows how to enable IGMP authentication on port 1/0/1-3:
Switch#configure
Switch(config)#interface range gigabitEhternet 1/0/1-3
Switch(config-if-range)#ip igmp snooping authentication
Switch(config-if-range)#show ip igmp snooping interface gigabitEthernet 1/0/1-3
authentication

Configuration Guide

Configuring Layer 2 Multicast

IGMP Snooping Configuration

Port

IGMP-Authentication

-----------

-------------------------

Gi1/0/1

enable

Gi1/0/2

enable

Gi1/0/3

enable

Switch(config)#end
Switch#copy running-config startup-config

Configuration Guide

Configuring Layer 2 Multicast

MLD Snooping Configuration

MLD Snooping Configuration
To complete MLD Snooping configuration, follow these steps:

1) Enable MLD Snooping globally and configure the global parameters.
2) Configure MLD Snooping for VLANs.
3) Configure MLD Snooping for ports.

4) (Optional) Configure hosts to statically join a group.
Note:

MLD Snooping takes effect only when it is enabled globally, in the corresponding VLAN and port at
the same time.

3.1

Using the GUI

3.1.1 Configuring MLD Snooping Globally
Choose the menu L2 FEATURES > Multicast > MLD Snooping > Global Config to load the
following page.
Figure 3-1

Configure MLD Snooping Globally

Follow these steps to configure MLD Snooping globally:

1) In the Global Config section, enable MLD Snooping and configure the Unknown
Multicast Groups feature globally.
MLD Snooping

Enable or disable MLD Snooping globally.

Unknown
Multicast Groups

Configure the way in which the switch processes data that are sent to unknown
multicast groups as Forward or Discard. By default, it is Forward.
Unknown multicast groups are multicast groups that do not match any of the
groups announced in earlier IGMP membership reports, and thus cannot be
found in the multicast forwarding table of the switch.

Note: IGMP Snooping and MLD Snooping share the setting of Unknown
Multicast Groups, so you have to enable IGMP Snooping globally on the L2
FEATURES > Multicast > IGMP Snooping > Global Config page at the same
time.

Configuration Guide

Configuring Layer 2 Multicast

MLD Snooping Configuration

2) Click Apply.

3.1.2 Configuring MLD Snooping for VLANs
Before configuring MLD Snooping for VLANs, set up the VLANs that the router ports and
the member ports are in. For details, please refer to Configuring 802.1Q VLAN.
The switch supports configuring MLD Snooping on a per-VLAN basis. After MLD
Snooping is enabled globally, you also need to enable MLD Snooping and configure the
corresponding parameters for the VLANs that the router ports and the member ports are
in.
Choose the menu L2 FEATURES > Multicast > MLD Snooping > Global Config, and click
in your desired VLAN entry in the MLD VLAN Config section to load the following page.
Figure 3-2

Configure MLD Snooping for VLAN

Follow these steps to configure MLD Snooping for a specific VLAN:

1) Enable MLD Snooping for the VLAN, and configure the corresponding parameters.
VLAN ID

Displays the VLAN ID.

MLD Snooping
Status

Enable or disable MLD Snooping for the VLAN.

Configuration Guide

Configuring Layer 2 Multicast

Fast Leave

MLD Snooping Configuration

Enable or disable Fast Leave for the VLAN.
Without Fast Leave, after a receiver sends an MLD done message (equivalent to
an IGMP leave message) to leave a multicast group, the switch will forward the
done message to the Layer 3 device (the querier).
From the point of view of the querier, the port connecting to the switch is a
member port of the corresponding multicast group. After receiving the done
message from the switch, the querier will send out a configured number (Last
Listener Query Count) of Multicast-Address-Specific Queries (MASQs) on that
port with a configured interval (Last Listener Query Interval), and wait for MLD
reports. If there are other receivers connecting to the switch, they will response
to the MASQs before the Last Listener Query Interval expires. If no reports are
received after the response time of the last query expires, the querier will remove
the port from the forwarding list of the corresponding multicast group.
That is, if there are other receivers connecting to the switch, the one sent done
message have to wait until the port ages out from the switch’s forwarding list of
the corresponding multicast group (the maximum waiting time is decided by the
Member Port Aging Time).
With Fast Leave enabled on a VLAN, the switch will remove the (Multicast Group,
Port, VLAN) entry from the multicast forwarding table before forwarding the done
message to the querier. This helps to reduce bandwidth waste since the switch
no longer sends the corresponding multicast streams to the VLAN of the port as
soon as the port receives a done message from the VLAN.

Report
Suppression

Enable or disable Report Suppression for the VLAN.

Member Port
Aging Time

Specify the aging time of the member ports in the VLAN.

When enabled, the switch will only forward the first MLD report message for
each multicast group to the MLD querier and suppress subsequent MLD report
messages for the same multicast group during one query interval. This feature
prevents duplicate report messages from being sent to the MLD querier.

Once the switch receives an MLD report message from a port, the switch adds
this port to the member port list of the corresponding multicast group. Member
ports that are learned in this way are called dynamic member ports.
If the switch does not receive any MLD report messages for a specific multicast
group from a dynamic member port, it will no longer consider this port as a
member port of this multicast group and delete it from the multicast forwarding
table.

Router Port
Aging Time

Specify the aging time of the router ports in the VLAN.
Once the switch receives an MLD general query message from a port, the switch
adds this port to the router port list. Router ports that are learned in this way are
called dynamic router ports.
If the switch does not receive any MLD general query messages from a dynamic
router port within the router port aging time, the switch will no longer consider this
port as a router port and delete it from the router port list.

Configuration Guide

Configuring Layer 2 Multicast

Leave Time

MLD Snooping Configuration

Specify the leave time for the VLAN.
When the switch receives a done message from a port to leave a multicast group,
it will wait for a leave time before removing the port from the multicast group.
During the period, if the switch receives any report messages from the port, the
port will not be removed from the multicast group. Exceptions are as follows:

•

If the member port ages out before the Leave Time ends and no report
messages are received, the port will be removed from the multicast group
once its Member Port Aging Time ends.

•

The Leave Time mechanism will not take effect when Fast Leave takes effect.

A proper leave time value can avoid other hosts connecting to the same port of
the switch being mistakenly removed from the multicast group when only some of
them want to leave.
MLD Snooping
Querier

Enable or disable the MLD Snooping Querier for the VLAN.
When enabled, the switch acts as an MLD Snooping Querier for the hosts in
this VLAN. A querier periodically sends a general query on the network to solicit
membership information, and sends MASQs when it receives done messages
from hosts.

Note:
To enable MLD Snooping Querier for a VLAN, MLD Snooping should be enabled
both globally and in the VLAN.
Query Interval

With MLD Snooping Querier enabled, specify the interval between general query
messages sent by the switch.

Maximum
Response Time

With MLD Snooping Querier enabled, specify the host’s maximum response time
to general query messages.

Last Listener
Query Interval

With MLD Snooping Querier enabled, when the switch receives a done message,
it obtains the address of the multicast group that the host wants to leave from
the message. Then the switch sends out MASQs to this multicast group through
the port receiving the done message. This parameter determines the interval
between MASQs.

Last Listener
Query Count

With MLD Snooping Querier enabled, specify the number of MASQs to be sent. If
specified count of MASQs are sent and no report message is received, the switch
will delete the multicast address from the multicast forwarding table.

General Query
Source IP

With MLD Snooping Querier enabled, specify the source IPv6 address of the
general query messages sent by the switch. It should be an IPv6 link-local
address..

Static Router
Ports

Select one or more ports to be the static router ports in the VLAN. Static router
ports do not age.
Multicast streams and MLD packets to all groups in this VLAN will be forwarded
through the static router ports. Multicast streams and MLD packets to the groups
that have dynamic router ports will be also forwarded through the corresponding
dynamic router ports.

Configuration Guide

Configuring Layer 2 Multicast

Forbidden
Router Ports

MLD Snooping Configuration

Select the ports to forbid them from being router ports in the VLAN.

2) Click Save.

3.1.3 Configuring MLD Snooping for Ports
Choose the menu L2 FEATURES > Multicast > MLD Snooping > Port Config to load the
following page.
Figure 3-3

Configure MLD Snooping for Ports

Follow these steps to configure MLD Snooping for ports:

1) Enable MLD Snooping for the port and enable Fast Leave if there is only one receiver
connected to the port.
MLD Snooping

Enable or disable MLD Snooping for the port.

Fast Leave

Enable or disable Fast Leave for the port.
Fast Leave can be enabled on a per-port basis or per-VLAN basis. When enabled
on a per-port basis, the switch will remove the port from the corresponding
multicast group of all VLANs before forwarding the done message to the querier.
You should only use Fast Leave for a port when there is a single receiver
connected to the port. For more details about Fast Leave, see 3.1.2 Configuring
MLD Snooping for VLANs.

LAG

Displays the LAG the port belongs to.

2) Click Apply.

Configuration Guide

Configuring Layer 2 Multicast

MLD Snooping Configuration

3.1.4 Configuring Hosts to Statically Join a Group
Hosts or Layer 2 ports normally join multicast groups dynamically, but you can also
configure hosts to statically join a group.
Choose the menu L2 FEATURES > Multicast > MLD Snooping > Static Group Config and
to load the following page.

click

Figure 3-4

Configure Hosts to Statically Join a Group

Follow these steps to configure hosts to statically join a group:

1) Specify the multicast IP address, VLAN ID. Select the ports to be the static member
ports of the multicast group.
Multicast IP

Specify the IPv6 address of the multicast group that the hosts need to join.

VLAN ID

Specify the VLAN that the hosts are in.

Member Ports

Select the ports that the hosts are connected to. These ports will become the
static member ports of the multicast group and will never age.

2) Click Create.

3.2

Using the CLI

3.2.1 Configuring MLD Snooping Globally
Follow these steps to configure MLD Snooping globally:
Step 1

configure

Enter global configuration mode.

Configuration Guide

Configuring Layer 2 Multicast

MLD Snooping Configuration

Step 2

ipv6 mld snooping

Step 3

ipv6 mld snooping drop-unknown

Enable MLD Snooping Globally.

Note: IGMP Snooping and MLD Snooping share the setting of Unknown Multicast Groups, you
need to ensure IGMP Snooping is enabled globally. To enable IGMP Snooping globally, use the
ip igmp snooping command in global configuration mode.
Step 4

show ipv6 mld snooping

Step 5

end

Step 6

copy running-config startup-config

Show the basic IGMP Snooping configuration.

Return to privileged EXEC mode.

Save the settings in the configuration file.

The following example shows how to enable MLD Snooping globally, and the way how the
switch processes multicast streams that are sent to unknown multicast groups as discard.
Switch#configure
Switch(config)#ipv6 mld snooping
Switch(config)#ip igmp snooping
Switch(config)#ipv6 mld snooping drop-unknown
Switch(config)#show ipv6 mld snooping
MLD Snooping

:Enable

Unknown Multicast

:Discard

...
Switch(config)#end
Switch#copy running-config startup-config

3.2.2 Configuring MLD Snooping for VLANs
Before configuring MLD Snooping for VLANs, set up the VLANs that the router ports and
the member ports are in. For details, please refer to Configuring 802.1Q VLAN.
The switch supports configuring MLD Snooping on a per-VLAN basis. After MLD
Snooping is enabled globally, you also need to enable MLD Snooping and configure the
Configuration Guide

Configuring Layer 2 Multicast

MLD Snooping Configuration

corresponding parameters for the VLANs that the router ports and the member ports are
in.
Follow these steps to configure MLD Snooping for VLANs:
Step 1

configure

Step 2

ipv6 mld snooping vlan-config vlan-id-list mtime member-time

Enter global configuration mode.

Enable MLD Snooping for the specified VLANs, and specify the member port aging time for the
VLANs.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).

member-time: Specify the aging time of the member ports in the specified VLANs. Valid values
are from 60 to 600 seconds. By default, it is 260 seconds.

Once the switch receives an MLD report message from a port, the switch adds this port to the
member port list of the corresponding multicast group. Member ports that are learned in this
way are called dynamic member ports.
If the switch does not receive any MLD report message for a specific multicast group from a
dynamic member port, it will no longer consider this port as a member port of this multicast
group and delete it from the multicast forwarding table.

Step 3

ipv6 mld snooping vlan-config vlan-id-list rtime router-time

Specify the router port aging time for the VLANs.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).

router-time: Specify the aging time of the router ports in the specified VLANs. Valid values are
from 60 to 600 seconds. By default, it is 300 seconds.

Once the switch receives an MLD general query message from a port, the switch adds this port
to the router port list. Router ports that are learned in this way are called dynamic router ports.
If the switch does not receive any MLD general query message from a dynamic router port
within the router port aging time, the switch will no longer consider this port as a router port
and delete it from the router port list.

Step 4

ipv6 mld snooping vlan-config vlan-id-list ltime leave-time

Specify the router port aging time for the VLANs.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).

leave-time: Specify the leave time for the VLAN(s). Valid values are from 1 to 30 in seconds,
and the default value is 1 second.

•

If the member port ages out before the Leave Time ends and no report messages are
received, the port will be removed from the multicast group once its Member Port Aging
Time ends.

•

The Leave Time mechanism will not take effect when Fast Leave takes effect.

A proper leave time value can avoid other hosts connecting to the same port of the switch
being mistakenly removed from the multicast group when only some of them want to leave.

Configuration Guide

Configuring Layer 2 Multicast

Step 5

MLD Snooping Configuration

ipv6 mld snooping vlan-config vlan-id-list report-suppression

(Optional) Enable Report Suppression for the VLANs. By default, it is disabled.

When enabled, the switch will only forward the first MLD report message for each multicast
group to the MLD querier and suppress subsequent MLD report messages for the same
multicast group during one query interval. This feature prevents duplicate report messages
from being sent to the MLD querier.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).
Step 6

ipv6 mld snooping vlan-config vlan-id-list immediate-leave

(Optional) Enable Fast Leave for the VLANs. By default, it is disabled.
Without Fast Leave, after a receiver sends an MLD done message (equivalent to an IGMP leave
message) to leave a multicast group, the switch will forward the done message to the Layer 3
device (the querier).
From the point of view of the querier, the port connecting to the switch is a member port of the
corresponding multicast group. After receiving the done message from the switch, the querier
will send out a configured number (Last Listener Query Count) of Multicast-Address-Specific
Queries (MASQs) on that port with a configured interval (Last Listener Query Interval), and wait
for MLD reports. If there are other receivers connecting to the switch, they will response to
the MASQs before the Last Listener Query Interval expires. If no reports are received after the
response time of the last query expires, the querier will remove the port from the forwarding
list of the corresponding multicast group.
That is, if there are other receivers connecting to the switch, the one sent done message have
to wait until the port ages out from the switch’s forwarding list of the corresponding multicast
group (the maximum waiting time is decided by the Member Port Aging Time).
With Fast Leave enabled on a VLAN, the switch will remove the (Multicast Group, Port, VLAN)
entry from the multicast forwarding table before forwarding the done message to the querier.
This helps to reduce bandwidth waste since the switch no longer sends the corresponding
multicast streams to the VLAN of the port as soon as the port receives a done message from
the VLAN.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).
Step 7

ipv6 mld snooping vlan-config vlan-id-list rport interface { fastEthernet port-list |
gigabitEthernet port-list | ten-gigabitEthernet port-list | port-channel lag-list }

(Optional) Specify the static router ports for the VLANs. Static router ports do not age.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).

ipv6 mld snooping vlan-config vlan-id-list router-ports-forbidden interface { fastEthernet
port-list | gigabitEthernet port-list | ten-gigabitEthernet port-list | port-channel lag-list }
(Optional) Specify the ports to forbid them from being router ports in the VLANs.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).

port-list : The number or the list of the Ethernet port that need to be forbidden from being router
ports.
lag-list : The ID or the list of the LAG that need to be forbidden from being router ports.

Configuration Guide

Configuring Layer 2 Multicast

Step 9

MLD Snooping Configuration

ipv6 mld snooping vlan-config vlan-id-list querier

(Optional) Enable MLD Snooping Querier for the VLAN. By default, it is disabled.

When enabled, the switch acts as an MLD Snooping Querier for the hosts in this VLAN. A
querier periodically sends a general query on the network to solicit membership information,
and sends group-specific queries when it receives done messages from hosts.

Note:
To enable MLD Snooping Querier for a VLAN, MLD Snooping should be enabled both globally
and in the VLAN.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).
After enabling MLD Snooping Querier feature, you need to specify the corresponding
parameters including the Last Member Query Count, Last Member Query Interval, Maximum
Response Time, Query Interval and General Query Source IP. Use the command below in global
configuration mode to configure the parameters:
ipv6 mld snooping vlan-config vlan-id-list querier { max-response-time response-time |
query-interval interval | general-query source-ip ip-addr | last-listener-query-count num |
last-listener-query-interval interval }

vlan-id-list: Specify the ID or the ID list of the VLAN(s).

response-time: Specify the host’s maximum response time to general query messages.

query-interval interval: Specify the interval between general query messages sent by the
switch.

ip-addr: Specify the source IP address of the general query messages sent by the switch. It
should be an IPv6 link-local address.

num: Specify the number of group-specific queries to be sent. With MLD Snooping Querier
enabled, when the switch receives a done message, it obtains the address of the multicast
group that the host wants to leave from the message. Then the switch sends out MASQs to
this multicast group through the port receiving the done message. If specified count of MASQs
are sent and no report message is received, the switch will delete the multicast address from
the multicast forwarding table.
last-listener-query-interval interval: Specify the interval between MASQs.

Step 10

show ipv6 mld snooping vlan vlan-id

Show the basic MLD snooping configuration in the specified VLAN.

Step 11

end

Step 12

copy running-config startup-config

Return to privileged EXEC mode.

Save the settings in the configuration file.

The following example shows how to enable MLD Snooping for VLAN 1, and configure the
member port aging time as 300 seconds, the router port aging time as 320 seconds, and
then enable Fast Leave and Report Suppression for the VLAN:
Switch#configure
Switch(config)#ipv6 mld snooping vlan-config 1 mtime 300

Configuration Guide

Configuring Layer 2 Multicast

MLD Snooping Configuration

Switch(config)#ipv6 mld snooping vlan-config 1 rtime 320
Switch(config)#ipv6 mld snooping vlan-config 1 immediate-leave
Switch(config)#ipv6 mld snooping vlan-config 1 report-suppression
Switch(config)#show ipv6 mld snooping vlan 1
Vlan Id: 1
Vlan MLD Snooping Status: Enable
Fast Leave: Enable
Report Suppression: Enable
Router Time: Enable
Member Time: Enable
Querier: Disable
...
Switch(config)#end
Switch#copy running-config startup-config
The following example shows how to enable MLD Snooping querier for VLAN 1, and
configure the query interval as 100 seconds, the maximum response time as 15 seconds,
the last listener query interval as 2 seconds, the last listener query count as 3, and the
general query source IP as FE80::1:
Switch#configure
Switch(config)#ipv6 mld snooping vlan-config 1 querier
Switch(config)#ipv6 mld snooping vlan-config 1 querier query-interval 100
Switch(config)#ipv6 mld snooping vlan-config 1 querier max-response-time 15
Switch(config)#ipv6 mld snooping vlan-config 1 querier last-listener-query-interval 2
Switch(config)#ipv6 mld snooping vlan-config 1 querier last-listener-query-count 3
Switch(config)#ipv6 mld snooping vlan-config 1 querier general-query source-ip
FE80::1
Switch(config)#show ipv6 mld snooping vlan 1
Vlan Id: 1
...
Querier:

Enable

Maximum Response Time:

Query Interval:

100
Configuration Guide

Configuring Layer 2 Multicast

MLD Snooping Configuration

Last Member Query Interval:

Last Member Query Count:

General Query Source IP:

fe80::1

...
Switch(config)#end
Switch#copy running-config startup-config

3.2.3 Configuring MLD Snooping for Ports
Follow these steps to configure MLD Snooping for ports:
Step 1

configure

Step 2

Enter global configuration mode.

Enter interface configuration mode.

Step 3

ipv6 mld snooping

Step 4

ipv6 mld snooping immediate-leave

Enable MLD Snooping for the port. By default, it is enabled.

(Optional) Enable Fast Leave on the specified port.

Fast Leave can be enabled on a per-port basis or per-VLAN basis. When enabled on a per-port
basis, the switch will remove the port from the corresponding multicast group of all VLANs
before forwarding the done message to the querier.
You should only use Fast Leave for a port when there is a single receiver connected to the
port. For more details about Fast Leave, see 3.2.2 Configuring MLD Snooping for VLANs.
Step 5

show ipv6 mld snooping interface [fastEthernet [ port-list ] | gigabitEthernet [ port-list ] | tengigabitEthernet [ port-list ] | port-channel [port-channel-list ]] basic-config
Show the basic MLD Snooping configuration on the specified port(s) or of all the ports.

Step 6

end

Step 7

copy running-config startup-config

Return to privileged EXEC mode.

Save the settings in the configuration file.

The following example shows how to enable MLD Snooping and fast leave for port 1/0/1-3:
Switch#configure
Switch(config)#interface range gigabitEhternet 1/0/1-3
Switch(config-if-range)#ipv6 mld snooping
Configuration Guide

Configuring Layer 2 Multicast

MLD Snooping Configuration

Switch(config-if-range)#ipv6 mld snooping immediate-leave
Switch(config-if-range)#show ipv6 mld snooping interface gigabitEthernet 1/0/1-3
Port

MLD-Snooping

Fast-Leave

-----------

-------------------

--------------

Gi1/0/1

enable

Gi1/0/2

enable

Gi1/0/3

enable

Switch(config-if-range)#end
Switch#copy running-config startup-config

3.2.4 Configuring Hosts to Statically Join a Group
Hosts or Layer 2 ports normally join multicast groups dynamically, but you can also
configure hosts to statically join a group.
Follow these steps to configure hosts to statically join a group:
Step 1

configure

Step 2

ipv6 mld snooping vlan-config vlan-id-list static ip interface {fastEthernet port-list |
gigabitEthernet port-list | ten-gigabitEthernet port-list | port-channel lag-list }

Enter global configuration mode.

vlan-id-list: Specify the ID or the ID list of the VLAN(s).

ip: Specify the IP address of the multicast group that the hosts want to join.

port-list / lag-list: Specify the ports that is connected to the hosts. These ports will become
static member ports of the group.
Step 3

show ipv6 mld snooping groups static

Step 4

end

Step 5

copy running-config startup-config

Show the static MLD Snooping configuration.

Return to privileged EXEC mode.

Save the settings in the configuration file.

The following example shows how to configure port 1/0/1-3 in VLAN 2 to statically join the
multicast group FF80::1001:
Switch#configure
Switch(config)#ipv6 mld snooping vlan-config 2 static FF80::1001 interface
gigabitEthernet 1/0/1-3
Switch(config)#show ipv6 mld snooping groups static
Configuration Guide

Configuring Layer 2 Multicast

MLD Snooping Configuration

Multicast-ip

VLAN-id

Addr-type

Switch-port

--------------

-------

---------

-----------

ff80::1001

static

Gi1/0/1-3

Switch(config)#end
Switch#copy running-config startup-config

Configuration Guide

Configuring Layer 2 Multicast

MVR Configuration

MVR Configuration
To complete MVR configuration, follow these steps:
1) Configure 802.1Q VLANs.
2) Configure MVR globally.

3) Add multicast groups to MVR.
4) Configure MVR for the ports.

5) Statically add ports to MVR groups.

Configuration Guidelines

 MVR does not support IGMPv3 messages.

 Do not configure MVR on private VLAN ports, otherwise MVR cannot take effect.

 MVR operates on the underlying mechanism of IGMP Snooping, but the two features
operate independently of each other. Both protocols can be enabled on a port at the
same time. When both are enabled, MVR listens to the report and leave messages only
for the multicast groups configured in MVR. All other multicast groups are managed by
IGMP Snooping.

4.1

Using the GUI

4.1.1 Configuring 802.1Q VLANs
Before configuring MVR, create an 802.1Q VLAN as the multicast VLAN. Add all source
ports (the uplink ports that receive multicast data from the router) to the multicast VLAN
as tagged ports. Configure 802.1Q VLANs for the receiver ports (ports that are connecting
to the hosts) according to network requirements. Note that receiver ports can only belong
to one VLAN and cannot be added to the multicast VLAN. For details, refer to Configuring
802.1Q VLAN.

Configuration Guide

Configuring Layer 2 Multicast

MVR Configuration

4.1.2 Configuring MVR Globally
Choose the menu L2 FEATURES > Multicast > MVR > MVR Config to load the following
page.
Figure 4-1

Configure MVR Globally

Follow these steps to configure MVR globally:

1) Enable MVR globally and configure the global parameters.
MVR

Enable or disable MVR globally.

MVR Mode

Specify the MVR mode as compatible or dynamic.
Compatible: In this mode, the switch does not forward report or leave
messages from the hosts to the IGMP querier. This means IGMP querier cannot
learn the multicast groups’ membership information from the switch. The IGMP
querier must be statically configured to transmit all the required multicast
streams to the switch via the multicast VLAN.
Dynamic: In this mode, after receiving report or leave messages from the hosts,
the switch will forward them to the IGMP querier via the multicast VLAN (with
appropriate translation of the VLAN ID). The IGMP querier can learn the multicast
groups’ membership information through the report and leave messages, and
transmit the multicast streams to the switch via the multicast VLAN according
to the multicast forwarding table.

Multicast VLAN ID

Specify an existing 802.1Q VLAN as the multicast VLAN.

Query Response
Time

Specify the maximum time to wait for the IGMP membership report since the
switch receives an IGMP leave message on a receiver port. After receiving
an IGMP leave message from a receiver port, the switch will send out groupspecific queries and wait for IGMP membership reports. If no IGMP membership
reports are received before the Query Response Time expires, the switch will
remove the port from the multicast group.

Maximum
Multicast Groups

Displays the maximum number of multicast groups that can be configured on
the switch.

Current Multicast
Groups

Displays the current number of multicast groups that have been configured on
the switch.

Configuration Guide

Configuring Layer 2 Multicast

MVR Configuration

2) Click Apply.

4.1.3 Adding Multicast Groups to MVR
You need to manually add multicast groups to the MVR. Choose the menu L2 FEATURES >
Multicast > MVR > MVR Group Config and click
Figure 4-2

to load the following page.

Add Multicast Groups to MVR

Follow these steps to add multicast groups to MVR:
1) Specify the IP address of the multicast groups.
MVR Group IP /
MVR Group Count

Specify the start IP address and the number of contiguous series of multicast
groups.
Multicast data sent to the address specified here will be sent to all source ports
on the switch and all receiver ports that have requested to receive data from
that multicast address.

2) Click Create.
Then the added multicast groups will appear in the MVR group table, as the following figure
shows:
Figure 4-3

MVR Group Table

MVR Group IP

Displays the IP address of multicast group.

Configuration Guide

Configuring Layer 2 Multicast

Status

MVR Configuration

Displays the status of the MVR group. In compatible mode, all the MVR groups
are added manually, so the status is always active. In dynamic mode, there are two
status:
Inactive: The MVR group is added successfully, but the source port has not
received any query messages from this multicast group.
Active: The MVR group is added successfully and the source port has received
query messages from this multicast group.

Member

Displays the member ports in this MVR group.

4.1.4 Configuring MVR for the Port
Choose the menu L2 FEATURES > Multicast > MVR > Port Config to load the following
page.
Figure 4-4

Configure MVR for the Port

Follow these steps to add multicast groups to MVR:
1) Select one or more ports to configure.

2) Enable MVR, and configure the port type and Fast Leave feature for the port.
Mode

Enable or disable MVR for the selected ports.

Configuration Guide

Configuring Layer 2 Multicast

Type

MVR Configuration

Configure the port type.
None: The port is a non-MVR port. If you attempt to configure a non-MVR port
with MVR characteristics, the operation will be unsuccessful.
Source: Configure the uplink ports that receive and send multicast data on the
multicast VLAN as source ports. Source ports should belong to the multicast
VLAN. In compatible mode, source ports will be automatically added to all
multicast groups, while in dynamic mode, you need to manually add them to the
corresponding multicast groups.
Receiver: Configure the ports that are connecting to the hosts as receiver
ports. A receiver port can only belong to one VLAN, and cannot belong to the
multicast VLAN. In both modes, the switch will add or remove the receiver
ports to the corresponding multicast groups by snooping the report and leave
messages from the hosts.

Status

Displays the port’s status.
Active/InVLAN: The port is physically up and in one or more VLANs.
Active/NotInVLAN: The port is physically up and not in any VLAN.
Inactive/InVLAN: The port is physically down and in one or more VLANs.
Inactive/NotInVLAN: The port is physically down and not in any VLAN.

Fast Leave

Enable or disable Fast Leave for the selected ports. Only receiver ports support
Fast Leave. Before enabling Fast Leave for a port, make sure there is only a
single receiver device connecting to the port.

3) Click Apply.

4.1.5 (Optional) Adding Ports to MVR Groups Statically
You can add only receiver ports to MVR groups statically. The switch adds or removes
receiver ports to the corresponding multicast groups by snooping the report and leave
messages from the hosts. You can also statically add a receiver port to an MVR group.
Choose the menu L2 FEATURES > Multicast > MVR > Static Group Members, and click
in your desired MVR group entry to load the following page.
Figure 4-5

Configure Hosts to Statically Join an MVR group

Configuration Guide

Configuring Layer 2 Multicast

MVR Configuration

Follow these steps to statically add ports to an MVR group:
1) Select the ports to add them to the MVR group.
2) Click Save.

4.2

Using the CLI

4.2.1 Configuring 802.1Q VLANs
Before configuring MVR, create an 802.1Q VLAN as the multicast VLAN. Add the all source
ports to the multicast VLAN as tagged ports. Configure 802.1Q VLANs for the receiver
ports according to network requirements. Note that receiver ports can only belong to one
VLAN and cannot be added to the multicast VLAN. For details, refer to Configuring 802.1Q
VLAN.

4.2.2 Configuring MVR Globally
Follow these steps to configure MVR globally:
Step 1

configure

Step 2

mvr

Step 3

mvr mode { compatible | dynamic }

Enter global configuration mode.

Enable MVR Globally.

Configure the MVR mode as compatible or dynamic.

compatible: In this mode, the switch does not forward report or leave messages from the
hosts to the IGMP querier. So the IGMP querier cannot learn the multicast groups membership
information from the switch. You have to statically configure the IGMP querier to transmit all
the required multicast streams to the switch via the multicast VLAN.

dynamic: In this mode, after receiving report or leave messages from the hosts, the switch
will forward them to the IGMP querier via the multicast VLAN (with appropriate translation of
the VLAN ID). So the IGMP querier can learn the multicast groups membership information
through the report and leave messages, and transmit the multicast streams to the switch via
the multicast VLAN according to the multicast forwarding table.

Step 4

mvr vlan vlan-id

Specify the multicast VLAN.

vlan-id: Specify the ID of the multicast VLAN. Valid values are from 1 to 4094.

Configuration Guide

Configuring Layer 2 Multicast

Step 5

MVR Configuration

mvr querytime time

Specify the maximum time to wait for the IGMP membership reports since the switch receives
an IGMP leave message on a receiver port.

time: Specify the maximum response time. After receiving an IGMP leave message from a
receiver port, the switch will send out group-specific queries and wait for IGMP membership
reports. If no IGMP membership reports are received before this configured time expires, the
switch will remove the port from the multicast group. Valid values are from 1 to100 tenths of a
second, and the default value is 5 tenths of a second.
Step 6

mvr group ip-addr count

Add multicast groups to the MVR.

ip-addr: Specify the start IP address of the contiguous series of multicast groups.
count: Specify the number of the multicast groups to be added to the MVR. The range is 1 to
256.
Step 7

show mvr

Show the global MVR configuration.
show mvr members

Show the existing MVR groups.
Step 8

end

Step 9

copy running-config startup-config

Return to privileged EXEC mode.

Save the settings in the configuration file.

The following example shows how to enable MVR globally, and configure the MVR mode
as compatible, the multicast VLAN as VLAN 2 and the query response time as 5 tenths of a
second. Then add 239.1.2.3-239.1.2.5 to MVR group.
Switch#configure
Switch(config)#mvr mode compatible
Switch(config)#mvr vlan 2
Switch(config)#mvr querytime 5
Switch(config)#mvr group 239.1.2.3 3
Switch(config)#show mvr
MVR

:Enable

MVR Multicast Vlan

MVR Max Multicast Groups

:256

MVR Current Multicast Groups

:3
Configuration Guide

Configuring Layer 2 Multicast

MVR Configuration

MVR Global Query Response Time :5 (tenths of sec)
MVR Mode Type

:Compatible

Switch(config)#show mvr members
MVR Group IP

status

Members

----------------

---------

----------------

239.1.2.3

active

239.1.2.4

active

239.1.2.5

active

Switch(config)#end
Switch#copy running-config startup-config

4.2.3 Configuring MVR for the Ports
Follow these steps to configure MVR for the ports:
Step 1

configure

Step 2

interface {fastEthernet port | range fastEthernet port-list | gigabitEthernet port | range
gigabitEthernet port-list | ten-gigabitEthernet port | range ten-gigabitEthernet port-list }

Enter global configuration mode.

Enter interface configuration mode.
Step 3

mvr

Step 4

mvr type { source | receiver }

Enable MVR for the port.

Configure the MVR port type as receiver or source. By default, the port is a non-MVR port. If
you attempt to configure a non-MVR port with MVR characteristics, the operation fails.
source: Configure the uplink ports that receive and send multicast data on the multicast VLAN
as source ports. Source ports should belong to the multicast VLAN.
receiver: Configure the ports that are connecting to the hosts as receiver ports. A receiver
port can only belong to one VLAN, and cannot belong to the multicast VLAN.

Step 5

mvr immediate

(Optional) Enable the Fast Leave feature of MVR for the port. Only receiver ports support Fast
Leave. Before enabling Fast Leave for a port, make sure there is only a single receiver device
connecting to the port.

Configuration Guide

Configuring Layer 2 Multicast

Step 6

MVR Configuration

mvr vlan vlan-id group ip-addr

(Optional) Statically add the port to an MVR group. Then the port can receive multicast traffic
sent to the IP multicast address via the multicast VLAN.
This command applies to only receiver ports. The switch adds or removes the receiver ports
to the corresponding multicast groups by snooping the report and leave messages from the
hosts. You can also statically add a receiver port to an MVR group.

vlan-id : Enter the multicast VLAN ID.

ip-addr : Specify the IP address of the multicast group.
Step 7

show mvr interface {fastEthernet [port-list ] | gigabitEthernet [port-list ] | ten-gigabitEthernet
[port-list ] }
Show the MVR configuration of the specified interface(s).

show mvr members

Show the membership information of all MVR groups.
Step 8

end

Step 9

copy running-config startup-config

Return to privileged EXEC mode.

Save the settings in the configuration file.

The following example shows how to configure port 1/0/7 as source port, and port 1/0/1-3
as receiver ports. Then statically add port 1/0/1-3 to group 239.1.2.3 and enable MVR Fast
Leave for these ports. The multicast VLAN is VLAN 2.
Switch#configure
Switch(config)#interface gigabitEthernet 1/0/7
Switch(config-if)#mvr
Switch(config-if)#mvr type source
Switch(config-if)#exit
Switch(config)#interface range gigabitEthernet 1/0/1-3
Switch(config-if-range)#mvr
Switch(config-if-range)#mvr type receiver
Switch(config-if-range)#mvr immediate
Switch(config-if-range)#mvr vlan 2 group 239.1.2.3
Switch(config-if-range)#show mvr interface gigabitEtnernet 1/0/1-3,1/0/7

Configuration Guide

Configuring Layer 2 Multicast

MVR Configuration

Port

Mode

Type

Status

Immediate Leave

-----------

----------

------------

---------------------

Gi1/0/1

Enable

Receiver

INACTIVE/InVLAN

Enable

Gi1/0/2

Enable

Receiver

INACTIVE/InVLAN

Enable

Gi1/0/3

Enable

Receiver

INACTIVE/InVLAN

Enable

Gi1/0/7

Enable

Source

INACTIVE/InVLAN

Disable

Switch(config-if-range)#show mvr members
MVR Group IP

status

Members

----------------

---------

----------------

239.1.2.3

active

Gi1/0/1-3, 1/0/7

Switch(config)#end
Switch#copy running-config startup-config

Configuration Guide

Configuring Layer 2 Multicast

Multicast Filtering Configuration

Multicast Filtering Configuration
To complete multicast filtering configuration, follow these steps:
1) Create the IGMP profile or MLD profile.

2) Configure multicast groups a port can join and the overflow action.

5.1

Using the GUI

5.1.1 Creating the Multicast Profile
You can create multicast profiles for both IPv4 and IPv6 network. With multicast profile,
the switch can define a blacklist or whitelist of multicast groups so as to filter multicast
sources.
The process for creating multicast profiles for IPv4 and IPv6 are similar. The following
introductions take creating an IPv4 profile as an example.
Choose the menu L2 FEATURES > Multicast > Multicast Filtering > IPv4 Profile, and click
to load the following page.

Note:

To create a multicast profile for IPv6, choose the menu L2 FEATURES > Multicast > Multicast
Filtering > IPv6 Profile.

Configuration Guide

Configuring Layer 2 Multicast

Figure 5-1

Multicast Filtering Configuration

Create IPv4 Profile

Follow these steps to create a profile.

1) In the General Config section, specify the Profile ID and Mode.
Profile ID

Enter a profile ID between 1 and 999.

Mode

Select Permit or Deny as the filtering mode.
Permit: Acts as a whitelist and only allows specific member ports to join specified
multicast groups.
Deny: Acts as a blacklist and prevents specific member ports from joining specific
multicast groups.

2) In the IP-Range section, click
to load the following page. Configure the start IP
address and end IP address of the multicast groups to be filtered, and click Create.

Configuration Guide

Configuring Layer 2 Multicast

Figure 5-2

Multicast Filtering Configuration

Configure Multicast Groups to Be Filtered

3) In the Bind Ports section, select your desired ports to be bound with the profile.
4) Click Save.

5.1.2 Configure Multicast Filtering for Ports
You can modify the mapping relation between ports and profiles in batches, and configure
the number of multicast groups a port can join and the overflow action.
The process for configuring multicast filtering for ports in IPv4 and IPv6 are similar. The
following introductions take configuring multicast filtering for ports in IPv4 as an example.
Choose the menu L2 FEATURES > Multicast > Multicast Filtering > IPv4 Port Binding to
load the following page.
Note:

For IPv6, choose the menu L2 FEATURES > Multicast > Multicast Filtering > IPv6 Port Binding.
Figure 5-3

Configure Multicast Filtering for Ports

Configuration Guide

Configuring Layer 2 Multicast

Multicast Filtering Configuration

Follow these steps to bind the profile to ports and configure the corresponding parameters
for the ports:
1) Select one or more ports to configure.

2) Specify the profile to be bound, and configure the maximum groups the port can join
and the overflow action.
Profile ID

Specify the ID of an existing profile to bind the profile to the selected ports. One
port can only be bound to one profile.

Maximum
Groups

Enter the number of multicast groups the port can join.
For T2600G and T1600G series switches except T1600G-28TS V3, valid values
are from 0 to 1000.
For other switches, valid values are from 0 to 511.

Overflow Action

Select the action the switch will take with the new multicast member groups when
the number of multicast groups the port has joined exceeds the maximum.
Drop: Drop all subsequent membership report messages to prevent the port
joining a new multicast groups.
Replace: Replace the existing multicast group that has the lowest multicast MAC
address with the new multicast group.

LAG

Displays the LAG the port belongs to.

Operation

Click Clear Profile to clear the binding between the profile and the port.

3) Click Apply.

5.2

Using the CLI

5.2.1 Creating the Multicast Profile
You can create multicast profiles for both IPv4 and IPv6 network. With multicast profile,
the switch can define a blacklist or whitelist of multicast groups so as to filter multicast
sources.

Creating IGMP Profile (Multicast Profile for IPv4)
Step 1

configure

Step 2

ip igmp profile id

Enter global configuration mode.

Create a new profile and enter profile configuration mode.

Configuration Guide

Configuring Layer 2 Multicast

Step 3

Multicast Filtering Configuration

Permit

Configure the profile’s filtering mode as permit. Then the profile acts as a whitelist and only
allows specific member ports to join specified multicast groups.

deny

Configure the profile’s filtering mode as deny. Then the profile acts as a blacklist and prevents
specific member ports from joining specific multicast groups.
Step 4

range start-ip end-ip

Configure the range of multicast IP addresses to be filtered.

start-ip / end-ip: Specify the start IP address and end IP address of the IP range.
Step 5

show ip igmp profile [id ]

Show the detailed IGMP profile configuration.

Step 6

end

Step 7

copy running-config startup-config

Return to privileged EXEC mode.

Save the settings in the configuration file.

The following example shows how to configure Profile 1 so that the switch filters multicast
streams sent to 226.0.0.5-226.0.0.10:
Switch#configure
Switch(config)#ip igmp snooping
Switch(config)#ip igmp profile 1
Switch(config-igmp-profile)#deny
Switch(config-igmp-profile)#range 226.0.0.5 226.0.0.10
Switch(config-igmp-profile)#show ip igmp profile
IGMP Profile 1
deny
range 226.0.0.5 226.0.0.10
Switch(config)#end
Switch#copy running-config startup-config

Creating MLD Profile (Multicast Profile for IPv6)
Step 1

configure

Enter global configuration mode.

Configuration Guide

Configuring Layer 2 Multicast

Step 2

Step 3

Multicast Filtering Configuration

ipv6 mld profile id

Create a new profile and enter profile configuration mode.
Permit

Configure the profile’s filtering mode as permit. It is similar to a whitelist, indicating that the
switch only allow specific member ports to join specific multicast groups.

deny

Configure the profile’s filtering mode as deny. It is similar to a blacklist, indicating that the
switch disallow specific member ports to join specific multicast groups.
Step 4

range start-ip end-ip

Configure the range of multicast IP addresses to be filtered.

start-ip / end-ip: Specify the start IP address and end IP address of the IP range.
Step 5

show ipv6 mld profile [id ]

Show the detailed MLD profile configuration.

Step 6

end

Step 7

copy running-config startup-config

Return to privileged EXEC mode.

Save the settings in the configuration file.

The following example shows how to configure Profile 1 so that the switch filters multicast
streams sent to ff01::1234:5-ff01::1234:8:
Switch#configure
Switch(config)#ipv6 mld snooping
Switch(config)#ipv6 mld profile 1
Switch(config-mld-profile)#deny
Switch(config-mld-profile)#range ff01::1234:5 ff01::1234:8
Switch(config-mld-profile)#show ipv6 mld profile
MLD Profile 1
deny
range ff01::1234:5 ff01::1234:8
Switch(config)#end
Switch#copy running-config startup-config

Configuration Guide

Configuring Layer 2 Multicast

Multicast Filtering Configuration

5.2.2 Binding the Profile to Ports
You can bind the created IGMP profile or MLD profile to ports, and configure the number of
multicast groups a port can join and the overflow action.

Binding the IGMP Profile to Ports
Step 1

configure

Step 2

Enter global configuration mode.

Enter interface configuration mode.

Step 3

ip igmp filter profile-id

Bind the IGMP profile to the specified ports.

profile-id : Specify the ID of the profile to be bound. It should be an existing profile.
Step 4

ip igmp snooping max-groups maxgroup

Configure the maximum number of multicast groups the port can join.

maxgroup : Specify the maximum number of multicast groups the port can join.
For T2600G and T1600G series switches except T1600G-28TS V3, valid values are from 0 to
1000.
For other switches, valid values are from 0 to 511.
Step 5

ip igmp snooping max-groups action {drop | replace}

Specify the action towards the new multicast group when the number of multicast groups the
port joined exceeds the limit.
drop: Drop all subsequent membership report messages, and the port join no more new
multicast groups.
replace: Replace the existing multicast group owning the lowest multicast MAC address with
the new multicast group.

Step 6

show ip igmp profile [id ]

Show the detailed IGMP profile configurations.

show ip igmp snooping interface [fastEthernet [ port-list ] | gigabitEthernet [ port-list ] | tengigabitEthernet [ port-list ] | port-channel [port-channel-list ] ] max-groups
Show the multicast group limitation on the specified port(s) or of all the ports.

Step 7

end

Return to privileged EXEC mode.

Configuration Guide

Configuring Layer 2 Multicast

Step 8

Multicast Filtering Configuration

copy running-config startup-config

Save the settings in the configuration file.

The following example shows how to bind the existing Profile 1 to port 1/0/2, and specify
the maximum number of multicast groups that port 1/0/2 can join as 50 and the Overflow
Action as Drop:
Switch#configure
Switch(config)#interface gigabitEthernet 1/0/2
Switch(config-if)#ip igmp snooping
Switch(config-if)#ip igmp filter 1
Switch(config-if)#ip igmp snooping max-groups 50
Switch(config-if)#ip igmp snooping max-groups action drop
Switch(config-if)#show ip igmp profile
IGMP Profile 1
...
Binding Port(s)
Gi1/0/2
Switch(config-if)#show ip igmp snooping interface gigabitEthernet 1/0/2 max-groups
Port

Max-Groups

Overflow-Action

-------------

---------------

---------------------

Gi1/0/2

Drops

Switch(config)#end
Switch#copy running-config startup-config

Binding the MLD Profile to Ports
Step 1

configure

Step 2

Enter global configuration mode.

Enter interface configuration mode.

Configuration Guide

Configuring Layer 2 Multicast

Step 3

Multicast Filtering Configuration

ipv6 mld filter profile-id

Bind the MLD profile to the specified ports.

profile-id : Specify the ID of the profile to be bound. It should be an existing profile.
Step 4

ipv6 mld snooping max-groups maxgroup

Configure the maximum number of multicast groups the port can join.

maxgroup : Specify the maximum number of multicast groups the port can join. The range is 0
to 1000.
Step 5

ipv6 mld snooping max-groups action {drop | replace}

Specify the action towards the new multicast group when the number of multicast groups the
port joined exceeds max group.
drop: Drop all subsequent membership report messages, and the port join no more new
multicast groups.
replace: Replace the existing multicast group owning the lowest multicast MAC address with
the new multicast group.

Step 6

show ipv6 mld profile [id ]

Show the detailed MLD profile configuration.

show ipv6 mld snooping interface [fastEthernet [ port-list ] | gigabitEthernet [ port-list ] | tengigabitEthernet [ port-list ] | port-channel [port-channel-list ] ] max-groups
Show the multicast group limitation on the specified port(s) or of all the ports.

Step 7

end

Step 8

copy running-config startup-config

Return to privileged EXEC mode.

Save the settings in the configuration file.

The following example shows how to bind the existing Profile 1 to port 1/0/2, and specify
the maximum number of multicast groups that port 1/0/2 can join as 50 and the Overflow
Action as Drop:
Switch#configure
Switch(config)#interface gigabitEthernet 1/0/2
Switch(config-if)#ipv6 mld snooping
Switch(config-if)#ipv6 mld filter 1
Switch(config-if)#ipv6 mld snooping max-groups 50
Switch(config-if)#ipv6 mld snooping max-groups action drop
Switch(config-if)#show ipv6 mld profile
MLD Profile 1
Configuration Guide

Configuring Layer 2 Multicast

Multicast Filtering Configuration

...
Binding Port(s)
Gi1/0/2
Switch(config-if)#show ipv6 mld snooping interface gigabitEthernet 1/0/2 max-groups
Port

Max-Groups

Overflow-Action

-------------

---------------

---------------------

Gi1/0/2

Drops

Switch(config)#end
Switch#copy running-config startup-config

Configuration Guide

Configuring Layer 2 Multicast

Viewing Multicast Snooping Information

Viewing Multicast Snooping Information
You can view the following multicast snooping information:
 View IPv4 multicast table.

 View IPv4 multicast statistics on each port.
 View IPv6 multicast table.

 View IPv6 multicast statistics on each port.

6.1

Using the GUI

6.1.1 Viewing IPv4 Multicast Table
Choose the menu L2 FEATURES > Multicast > Multicast Info > IPv4 Multicast Table to
load the following page:
Figure 6-1

IPv4 Multicast Table

The multicast IP address table shows all valid Multicast IP-VLAN-Port entries:
Multicast IP

Displays the multicast source IP address.

VLAN ID

Displays the ID of the VLAN the multicast group belongs to.

Source

Displays the source of the multicast entry.
IGMP Snooping: The multicast entry is learned by IGMP Snooping.
MVR: The multicast entry is learned by MVR.

Type

Displays how the multicast entry is generated.
Dynamic: The entry is dynamically learned. All the member ports are dynamically
added to the multicast group.
Static: The entry is manually added. All the member ports are manually added to the
multicast group.
Mix: The entry is dynamically learned (manually learned), and some of the member
ports are manually added (dynamically added) to the multicast group.

Configuration Guide

Configuring Layer 2 Multicast

Forward Ports

Viewing Multicast Snooping Information

All ports in the multicast group, including router ports and member ports.

6.1.2 Viewing IPv4 Multicast Statistics on Each Port
Choose the menu L2 FEATURES > Multicast > Multicast Info > IPv4 Multicast Statistics
to load the following page:
Figure 6-2

IPv4 Multicast Statistics

Follow these steps to view IPv4 multicast statistics on each port:

1) To get the real-time multicast statistics, enable Auto Refresh, or click Refresh.
Auto Refresh

Enable or disable Auto Refresh. When enabled, the switch will automatically
refresh the multicast statistics.

Refresh Interval

After Auto Refresh is enabled, specify the time interval for the switch to refresh
the multicast statistics.

2) In the Port Statistics section, view IPv4 multicast statistics on each port.
Query Packets

Displays the number of query packets received by the port.

Report Packets
(v1)

Displays the number of IGMPv1 report packets received by the port.

Configuration Guide

Configuring Layer 2 Multicast

Viewing Multicast Snooping Information

Report Packets
(v2)

Displays the number of IGMPv2 report packets received by the port.

Report Packets
(v3)

Displays the number of IGMPv3 report packets received by the port.

Leave Packets

Displays the number of leave packets received by the port.

Error Packets

Displays the number of error packets received by the port.

6.1.3 Viewing IPv6 Multicast Table
Choose the menu L2 FEATURES > Multicast > Multicast Info > IPv6 Multicast Table to
load the following page:
Figure 6-3

IPv6 Multicast Table

The multicast IP address table shows all valid Multicast IP-VLAN-Port entries:
Multicast IP

Displays the multicast source IP address.

VLAN ID

Displays the ID of the VLAN the multicast group belongs to.

Source

Displays the source of the multicast entry.
MLD Snooping: The multicast entry is learned by IGMP Snooping.

Type

Forward Port

All ports in the multicast group, including router ports and member ports.

Configuration Guide

Configuring Layer 2 Multicast

Viewing Multicast Snooping Information

6.1.4 Viewing IPv6 Multicast Statistics on Each Port
Choose the menu L2 FEATURES > Multicast > Multicast Info > IPv6 Multicast Statistics
to load the following page:
Figure 6-4

IPv6 Multicast Statistics

Follow these steps to view IPv6 multicast statistics on each port:

1) To get the real-time IPv6 multicast statistics, enable Auto Refresh, or click Refresh.
Auto Refresh

Enable or disable Auto Refresh. When enabled, the switch will automatically
refresh the multicast statistics.

Refresh Interval

After Auto Refresh is enabled, specify the time interval for the switch to refresh
the multicast statistics.

2) In the Port Statistics section, view IPv6 multicast statistics on each port.
Query Packets

Displays the number of query packets received by the port.

Report Packets
(v1)

Displays the number of MLDv1 packets received by the port.

Report Packets
(v2)

Displays the number of MLDv2 packets received by the port.

Done Packets

Displays the number of done packets received by the port.

Configuration Guide

Configuring Layer 2 Multicast

Error Packets

6.2

Viewing Multicast Snooping Information

Displays the number of error packets received by the port.

Using the CLI

6.2.1 Viewing IPv4 Multicast Snooping Information
show ip igmp snooping groups [ vlan vlan-id ] [count | dynamic | dynamic count | static | static count ]
Displays information of specific multicast group in all VLANs or in the specific VLAN.
count: Displays the number of multicast groups.

dynamic: Displays information of all dynamic multicast groups.

dynamic count: Displays the number of dynamic multicast groups.
static: Displays information of all static multicast groups.

static count: Displays the number of static multicast groups.
show ip igmp snooping interface [ fastEthernet [ port-list ] | gigabitEthernet [ port-list ] | tengigabitEthernet [ port-list ] ] packet-stat
Displays the packet statistics on specified ports or all ports.
clear ip igmp snooping statistics

Clear all statistics of all IGMP packets.

6.2.2 Viewing IPv6 Multicast Snooping Configurations
show ipv6 mld snooping groups [vlan vlan-id ] [count | dynamic | dynamic count | static | static count ]
Displays information of specific multicast group in all VLANs or in the specific VLAN.
count displays the number of multicast groups.

dynamic displays information of all dynamic multicast groups.

dynamic count displays the number of dynamic multicast groups.
static displays information of all static multicast groups.

static count displays the number of static multicast groups.
show ipv6 mld snooping interface [ fastEthernet [ port- list ] | gigabitEthernet [ port- list ] | tengigabitEthernet [ port- list ] ] packet-stat

Displays the packet statistics on specified ports or all ports.
clear ipv6 mld snooping statistics

Clear all statistics of all MLD packets.

Configuration Guide

Configuring Layer 2 Multicast

Configuration Examples

7.1

Example for Configuring Basic IGMP Snooping

7.1.1 Network Requirements
Host B, Host C and Host D are in the same VLAN of the switch. All of them want to receive
multicast streams sent to multicast group 225.1.1.1.
As shown in the following topology, Host B, Host C and Host D are connected to port
1/0/1, port 1/0/2 and port 1/0/3 respectively. Port 1/0/4 is the router port connected to the
multicast querier.
Figure 7-1

Network Topology for Basic IGMP Snooping

Internet
Source

Querier

Gi1/0/1

Gi1/0/4

Gi1/0/3

Gi1/0/2

Host B
Receiver

Host C
Receiver

Host D
Receiver

VLAN 10

7.1.2 Configuration Scheme
 Add the three member ports and the router port to a VLAN and configure their PVIDs.
 Enable IGMP Snooping globally and in the VLAN.

Configuration Guide

Configuring Layer 2 Multicast

Configuration Examples

 Enable IGMP Snooping on the ports.
Demonstrated with T2600G-28TS, this section provides configuration procedures in two
ways: using the GUI and using the CLI.

7.1.3 Using the GUI
1) Choose the menu L2 FEATURES > VLAN > 802.1Q VLAN > VLAN Config and click

to load the following page. Create VLAN 10 and add Untagged port 1/0/1-3 and
Tagged port 1/0/4 to VLAN 10.
Figure 7-2

Create VLAN 10

2) Choose the menu L2 FEATURES > VLAN > 802.1Q VLAN > Port Config to load the
following page. Configure the PVID of port 1/0/1-4 as 10.

Configuration Guide

Configuring Layer 2 Multicast

Figure 7-3

Configuration Examples

Configure PVID for the Ports

3) Choose the menu L2 FEATURES > Multicast > IGMP Snooping > Global Config to
load the following page. In the Global Config section, enable IGMP Snooping globally.
Configure the IGMP version as v3 so that the switch can process IGMP messages of all
versions. Then click Apply.
Figure 7-4

Configure IGMP Snooping Globally

4) In the IGMP VLAN Config section, click
IGMP Snooping for VLAN 10.

in VLAN 10 to load the following page. Enable

Configuration Guide

Configuring Layer 2 Multicast

Figure 7-5

Configuration Examples

Enable IGMP Snooping for VLAN 10

5) Choose the menu L2 FEATURES > Multicast > IGMP Snooping > Port Config to load
the following page. Enable IGMP Snooping for ports 1/0/1-4.
Figure 7-6

6) Click

Enable IGMP Snooping for the Ports

to save the settings.

7.1.4 Using the CLI
1) Create VLAN 10.

Configuration Guide

Configuring Layer 2 Multicast

Configuration Examples

Switch#configure
Switch(config)#vlan 10
Switch(config-vlan)#name vlan10
Switch(config-vlan)#exit

2) Add port 1/0/1-3 to VLAN 10 and set the link type as untagged. Add port 1/0/4 to VLAN
10 and set the link type as tagged.
Switch(config)#interface range gigabitEthernet 1/0/1-3
Switch(config-if-range)#switchport general allowed vlan 10 untagged
Switch(config-if-range)#exit
Switch(config)#interface gigabitEthernet 1/0/4
Switch(config-if)#switchport general allowed vlan 10 tagged
Switch(config-if)#exit

3) Set the PVID of port 1/0/1-4 as 10.
Switch(config)#interface range gigabitEthernet 1/0/1-4
Switch(config-if-range)#switchport pvid 10
Switch(config-if-range)#exit

4) Enable IGMP Snooping globally.
Switch(config)#ip igmp snooping

5) Enable IGMP Snooping in VLAN 10.
Switch(config)#ip igmp snooping vlan-config 10

6) Enable IGMP Snooping on port 1/0/1-4.

Switch(config)#interface range gigabitEthernet 1/0/1-4
Switch(config-if-range)#ip igmp snooping
Switch(config-if-range)#exit

7) Save the settings.

Switch(config)#end
Switch#copy running-config startup-config

Verify the Configurations

Show members in the VLAN:
Switch(config)#show vlan brief

Configuration Guide

Configuring Layer 2 Multicast

Configuration Examples

VLAN

Name

Status

Ports

-----

--------------------

---------

----------------------------------------

System-VLAN

active

Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4,
Gi1/0/5, Gi1/0/6, Gi1/0/7, Gi1/0/8,
...

vlan10

active

Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4

Show status of IGMP Snooping globally, on the ports and in the VLAN:
Switch(config)#show ip igmp snooping
IGMP Snooping

:Enable

IGMP Version

:V3

Header Validation

:Disable

Global Authentication Accounting

:Disable

Enable Port : Gi1/0/1-4
Enable VLAN:10

7.2

Example for Configuring MVR

7.2.1 Network Requirements
Host B, Host C and Host D are in three different VLANs of the switch. All of them want to
receive multicast streams sent to multicast group 225.1.1.1.

7.2.2 Network Topology
As shown in the following network topology, Host B, Host C and Host D are connected to
port 1/0/1, port 1/0/2 and port 1/0/3 respectively. Port 1/0/1, port 1/0/2 and port 1/0/3
belong to VLAN 10, VLAN 20 and VLAN 30 respectively. Port 1/0/4 is connected to the
multicast network in the upper layer network.

Configuration Guide

Configuring Layer 2 Multicast

Figure 7-7

Configuration Examples

Network Topoloy for Multicast VLAN

Internet
Source

Querier

VLAN 40
Gi1/0/1

Gi1/0/4

Gi1/0/3

Gi1/0/2

Host B
Receiver

Host C
Receiver

Host D
Receiver

7.2.3 Configuration Scheme
As the hosts are in different VLANs, in IGMP Snooping, the Querier need to duplicate
multicast streams for hosts in each VLAN. To avoid duplication of multicast streams being
sent between Querier and the switch, you can configure MVR on the switch.
The switch can work in either MVR compatible mode or MVR dynamic mode. When in
compatible mode, remember to statically configure the Querier to transmit the streams
of multicast group 225.1.1.1 to the switch via the multicast VLAN. Here we take the MVR
dynamic mode as an example.
Demonstrated with T2600G-28TS, this section provides configuration procedures in two
ways: using the GUI and using the CLI.

7.2.4 Using the GUI
1) Add port 1/0/1-3 to VLAN 10, VLAN 20 and VLAN 30 as Untagged ports respectively,
and configure the PVID of port 1/0/1 as 10, port 1/0/2 as 20, port 1/0/3 as 30. Make sure
port1/0/1-3 only belong to VLAN 10, VLAN 20 and VLAN 30 respectively. For details,
refer to Configuring 802.1Q VLAN.

Configuration Guide

Configuring Layer 2 Multicast

Figure 7-8

VLAN Configurations for Port 1/0/1-3

Figure 7-9

PVID for Port 1/0/1-3

Configuration Examples

2) Choose the menu L2 FEATURES > VLAN > 802.1Q VLAN > VLAN Config and click

to load the following page. Create VLAN 40 and add port 1/0/4 to the VLAN as
Tagged port.

Configuration Guide

Configuring Layer 2 Multicast

Figure 7-10

Configuration Examples

Create Multicast VLAN

3) Choose the menu L2 FEATURES > Multicast > MVR > MVR Config to load the following
page. Enable MVR globally, and configure the MVR mode as Dynamic, multicast VLAN
ID as 40.
Figure 7-11

Configure MVR Globally

4) Choose the menu L2 FEATURES > Multicast > MVR > MVR Group Config and click
to load the following page. Add multicast group 225.1.1.1 to MVR.

Configuration Guide

Configuring Layer 2 Multicast

Figure 7-12

Configuration Examples

Add Multicast Group to MVR

5) Choose the menu L2 FEATURES > Multicast > MVR > Port Config to load the following
page. Enable MVR for port 1/0/1-4. Configure port 1/0/1-3 as Receiver ports and port
1/0/4 as Source port.
Figure 7-13

6) Click

Configure MVR for the Ports

to save the settings.

7.2.5 Using the CLI
1) Create VLAN 10, VLAN 20, VLAN 30 and VLAN 40.
Switch#configure
Switch(config)#vlan 10,20,30,40
Switch(config-vlan)#exit

2) Add port 1/0/1-3 to VLAN 10, VLAN 20 and VLAN 30 as untagged ports respectively,
and configure the PVID of port 1/0/1 as 10, port 1/0/2 as 20, port 1/0/3 as 30. Add port
1/0/4 to VLAN 40 as tagged port and configure the PVID as of port 1/0/4 as 40.
Switch(config)#interface gigabitEthernet 1/0/1
Configuration Guide

Configuring Layer 2 Multicast

Configuration Examples

Switch(config-if)#switchport general allowed vlan 10 untagged
Switch(config-if)#switchport pvid 10
Switch(config-if)#exit
Switch(config)#interface gigabitEthernet 1/0/2
Switch(config-if)#switchport general allowed vlan 20 untagged
Switch(config-if)#switchport pvid 20
Switch(config-if)#exit
Switch(config)#interface gigabitEthernet 1/0/3
Switch(config-if)#switchport general allowed vlan 30 untagged
Switch(config-if)#switchport pvid 30
Switch(config-if)#exit
Switch(config)#interface gigabitEthernet 1/0/4
Switch(config-if)#switchport general allowed vlan 40 tagged
Switch(config-if)#switchport pvid 40
Switch(config-if)#exit

3) Check whether port1/0/1-3 only belong to VLAN 10, VLAN 20 and VLAN 30
respectively. If not, delete them from the other VLANs. By default, all ports are in VLAN 1,
so you need to delete them from VLAN 1.
Switch(config)#show vlan brief
VLAN

Name

Status

Ports

-------

----------------

---------

----------------------------------------

System-VLAN

active

Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4,
Gi1/0/5, Gi1/0/6, Gi1/0/7, Gi1/0/8,
...

VLAN10

active

Gi1/0/1

VLAN20

active

Gi1/0/2

VLAN30

active

Gi1/0/3

VLAN40

active

Gi1/0/4

Switch(config)#interface range gigabitEthernet 1/0/1-3
Switch(config-if-range)#no switchport general allowed vlan 1
Switch(config-if-range)#exit
Configuration Guide

Configuring Layer 2 Multicast

Configuration Examples

4) Enable MVR globally, and configure the MVR mode as Dynamic, multicast VLAN ID as
40. Add multicast group 225.1.1.1 to MVR.
Switch(config)#mvr
Switch(config)#mvr mode dynamic
Switch(config)#mvr vlan 40
Switch(config)#mvr group 225.1.1.1 1

5) Enable MVR for port 1/0/1-4. Configure port 1/0/1-3 as Receiver ports and port 1/0/4
as Source port.
Switch(config)#interface range gigabitEthernet 1/0/1-3
Switch(config-if-range)#mvr
Switch(config-if-range)#mvr type receiver
Switch(config-if-range)#exit
Switch(config)#interface gigabitEthernet 1/0/4
Switch(config-if)#mvr
Switch(config-if)#mvr type source
Switch(config-if)#exit

6) Save the settings.

Switch(config)#end
Switch#copy running-config startup-config

Verify the Configurations

Show the brief information of all VLANs:
Switch(config)#show vlan brief
VLAN

Name

Status

Ports

-------

----------------

---------

----------------------------------------

System-VLAN

active

Gi1/0/4, Gi1/0/5, Gi1/0/6, Gi1/0/7,
...

VLAN10

active

Gi1/0/1

VLAN20

active

Gi1/0/2

VLAN30

active

Gi1/0/3

VLAN40

active

Gi1/0/4

Configuration Guide

Configuring Layer 2 Multicast

Configuration Examples

Show the brief information of MVR:
Switch(config)#show mvr
MVR

:Enable

MVR Multicast Vlan

:40

MVR Max Multicast Groups

:256

MVR Current Multicast Groups

MVR Global Query Response Time

:5 (tenths of sec)

MVR Mode Type

:Dynamic

Show the membership of MVR groups:
Switch(config)#show mvr members

7.3

MVR Group IP

Status

Members

-----------------

------------

------------------

225.1.1.1

active

Gi1/0/4

Example for Configuring Unknown Multicast and Fast Leave

7.3.1 Network Requirement
A user experiences lag when he is changing channel on his IPTV. He wants solutions to
this problem. As shown in the following network topology, port 1/0/4 on the switch is
connected to the upper layer network, and port 1/0/2 is connected to Host B.

Configuration Guide

Configuring Layer 2 Multicast

Figure 7-14

Configuration Examples

Network Topology for Unknow Multicast and Fast Leave

Internet
Source
Querier

Gi1/0/4
VLAN 10

Gi1/0/2
VLAN 10

Host B
Receiver

7.3.2 Configuration Scheme
After the channel is changed, the client (Host B) still receives irrelevant multicast data,
the data from the previous channel and possibly other unknown multicast data, which
increases the network load and results in network congestion.
To avoid Host B from receiving irrelevant multicast data, you can enable Fast Leave on
port 1/0/2 and configure the switch to discard unknown multicast data. To change channel,
Host B sends a leave message about leaving the previous channel. With Fast Leave
enabled on port 1/0/2, the switch will then drop multicast data from the previous channel,
which ensures that Host B only receives multicast data from the new channel and that the
multicast network is unimpeded.
Demonstrated with T2600G-28TS, this section provides configuration procedures in two
ways: using the GUI and using the CLI.

7.3.3 Using the GUI
1) Create VLAN 10. Add port 1/0/2 to the VLAN as untagged port and port 1/0/4 as tagged
port. Configure the PVID of the two ports as 10. For details, refer to Configuring 802.1Q
VLAN.
2) Choose the menu L2 FEATURES > Multicast > IGMP Snooping > Global Config to load
the following page. In the Global Config section, enable IGMP Snooping globally and
configure Unknown Multicast Groups as Discard.
Configuration Guide

Configuring Layer 2 Multicast

Figure 7-15

Configuration Examples

Configure IGMP Snooping Globally

Note:

IGMP Snooping and MLD Snooping share the setting of Unknown Multicast, so you have to
enable MLD Snooping globally on the L2 FEATURES > Multicast > MLD Snooping > Global
Config page at the same time.

3) In the IGMP VLAN Config section, click
IGMP Snooping for VLAN 10.
Figure 7-16

in VLAN 10 to load the following page. Enable

Enable IGMP Snooping for VLAN 10

Configuration Guide

Configuring Layer 2 Multicast

Configuration Examples

4) Choose the menu L2 FEATURES > Multicast > IGMP Snooping > Port Config to load
the following page. Enable IGMP Snooping on port 1/0/2 and port 1/0/4 and enable Fast
Leave on port 1/0/2.
Figure 7-17

5) Click

Configure IGMP Snooping on Ports

to save the settings.

7.3.4 Using the CLI
1) Enable IGMP Snooping and MLD Snooping globally.
Switch#configure
Switch(config)#ip igmp snooping
Switch(config)#ipv6 mld snooping

2) Configure Unknown Multicast Groups as Discard globally.
Switch(config)#ip igmp snooping drop-unknown

3) Enable IGMP Snooping on port 1/0/2 and enable Fast Leave. On port 1/0/4, enable IGMP
Snooping.
Switch(config)#interface gigabitEthernet 1/0/2
Switch(config-if)#ip igmp snooping
Switch(config-if)#ip igmp snooping immediate-leave
Switch(config-if)#exit
Switch(config)#interface gigabitEthernet 1/0/4
Switch(config-if)#ip igmp snooping
Switch(config-if)#exit
Configuration Guide

Configuring Layer 2 Multicast

Configuration Examples

4) Enable IGMP Snooping in VLAN 10.
Switch(config)#ip igmp snooping vlan-config 10

5) Save the settings.

Switch(config)#end
Switch#copy running-config startup-config

Verify the Configurations

Show global settings of IGMP Snooping:
Switch(config)#show ip igmp snooping
IGMP Snooping

:Enable

IGMP Version

:V3

Unknown Multicast

:Discard

...
Enable Port: Gi1/0/1-28
Enable VLAN:10
Show settings of IGMP Snooping on port 1/0/2:
Switch(config)#show ip igmp snooping interface gigabitEthernet 1/0/2 basic-config

7.4

Port

IGMP-Snooping

Fast-Leave

---------

-------------------

----------

Gi1/0/2

enable

Example for Configuring Multicast Filtering

7.4.1 Network Requirements
Host B, Host C and Host D are in the same subnet. Host C and Host D only receive multicast
data sent to 225.0.0.1, while Host B receives all multicast data except the one sent from
225.0.0.2.

7.4.2 Configuration Scheme
With the functions for managing multicast groups, whitelist and blacklist mechanism (profile
binding), the switch can only allow specific member ports to join specific multicast groups
or disallow specific member ports to join specific multicast groups. You can achieve this
filtering function by creating a profile and binding it to the corresponding member port.

Configuration Guide

Configuring Layer 2 Multicast

Configuration Examples

7.4.3 Network Topology
As shown in the following network topology, Host B is connected to port 1/0/1, Host C is
connected to port 1/0/2 and Host D is connected to port 1/0/3. They are all in VLAN 10.
Figure 7-18

Network Topology for Multicast Filtering

Internet
Source
Querier

Gi1/0/1

VLAN 10

Host B
Receiver

Gi1/0/4

Gi1/0/3

Gi1/0/2

Host C
Receiver

Host D
Receiver

Demonstrated with T2600G-28TS, this section provides configuration procedures in two
ways: using the GUI and using the CLI.

7.4.4 Using the GUI
1) Create VLAN 10. Add port 1/0/1-3 to the VLAN as untagged port and port 1/0/4 as
tagged port. Configure the PVID of the four ports as 10. For details, refer to Configuring
802.1Q VLAN.
2) Choose the menu L2 FEATURES > Multicast > IGMP Snooping > Global Config to load
the following page. In the Global Config section, enable IGMP Snooping globally.

Configuration Guide

Configuring Layer 2 Multicast

Figure 7-19

Enable IGMP Snooping Globally

3) In the IGMP VLAN Config section, click
IGMP Snooping for VLAN 10.
Figure 7-20

Configuration Examples

in VLAN 10 to load the following page. Enable

Enable IGMP Snooping for VLAN 10

Configuration Guide

Configuring Layer 2 Multicast

Configuration Examples

4) Choose the menu L2 FEATURES > Multicast > IGMP Snooping > Port Config to load
the following page.
Figure 7-21

Enable IGMP Snooping on the Port

5) Choose the menu L2 FEATURES > Multicast > Multicast Filtering > IPv4 Profile
and click
to load the following page. Create Profile 1, specify the mode as
Permit, bind the profile to port 1/0/2-3, and specify the filtering multicast IP address as
225.0.0.1. Then click Back to return to the IPv4 Profile Table page.

Configuration Guide

Configuring Layer 2 Multicast

Figure 7-22

Configuration Examples

Configure Filtering Profile for Host C and Host D

6) Click
again to load the following page. Create Profile 2, specify the mode as
Deny, bind the profile to port 1/0/1, and specify the filtering multicast IP address as
225.0.0.2.

Configuration Guide

Configuring Layer 2 Multicast

Figure 7-23

7) Click

Configuration Examples

Configure Filtering Profile for Host B

to save the settings.

7.4.5 Using the CLI
1) Create VLAN 10.
Switch#configure
Switch(config)#vlan 10
Switch(config-vlan)#name vlan10
Switch(config-vlan)#exit

Configuring Layer 2 Multicast

Configuration Examples

3) Set the PVID of port 1/0/1-4 as 10.
Switch(config)#interface range gigabitEthernet 1/0/1-4
Switch(config-if-range)#switchport pvid 10
Switch(config-if-range)#exit

4) Enable IGMP Snooping Globally.
Switch(config)#ip igmp snooping

5) Enable IGMP Snooping in VLAN 10.
Switch(config)#ip igmp snooping vlan-config 10

6) Enable IGMP Snooping on port 1/0/1-4.

Switch(config)#interface range gigabitEthernet 1/0/1-4
Switch(config-if-range)#ip igmp snooping
Switch(config-if-range)#exit

7) Create Profile 1, configure the mode as permit, and add an IP range with both start IP
and end IP being 225.0.0.1.
Switch(config)#ip igmp profile 1
Switch(config-igmp-profile)#permit
Switch(config-igmp-profile)#range 225.0.0.1 225.0.0.1
Switch(config-igmp-profile)#exit

8) Bind Profile 1 to Port 1/0/2 and Port 1/10/3.
Switch(config)#interface range gigabitEthernet 1/0/2-3
Switch(config-if-range)#ip igmp filter 1
Switch(config-if-range)#exit

9) Create Profile 2, configure the mode as deny, and add an IP range with both start IP and
end IP being 225.0.0.2.
Switch(config)#ip igmp profile 2
Switch(config-igmp-profile)#deny
Switch(config-igmp-profile)#range 225.0.0.2 225.0.0.2
Switch(config-igmp-profile)#exit

10) Bind Profile 2 to Port 1/0/1.

Switch(config)#interface gigabitEthernet 1/0/1
Switch(config-if)#ip igmp filter 2
Switch(config-if)#exit
Configuration Guide

Configuring Layer 2 Multicast

Configuration Examples

11) Save the settings.
Switch(config)#end
Switch#copy running-config startup-config

Verify the Configurations

Show global settings of IGMP Snooping:
Switch(config)#show ip igmp snooping
IGMP Snooping

:Enable

IGMP Version

:V3

...

Enable Port:Gi1/0/1-4
Enable VLAN:10

Show all profile bindings:

Switch(config)#show ip igmp profile
IGMP Profile 1
permit

range 225.0.0.1 225.0.0.1
Binding Port(s)
Gi1/0/2-3

IGMP Profile 2
deny

range 225.0.0.2 225.0.0.2
Binding Port(s)
Gi1/0/1

Configuration Guide

Configuring Layer 2 Multicast

Appendix: Default Parameters

8.1

Default Parameters for IGMP Snooping
Table 8-1

Default Parameters of IGMP Snooping

Function

Global Settings of IGMP
Snooping

IGMP Snooping Settings in the
VLAN

IGMP Snooping Settings on
the Port and LAG

Parameter

Default Setting

IGMP Snooping

Disabled

IGMP Version

Unknown Multicast Groups

Forward

Header Validation

Disabled

IGMP Snooping

Disabled

Fast Leave

Disabled

Report Suppression

Disabled

Member Port Aging Time

260 seconds

Router Port Aging Time

300 seconds

Leave Time

1 second

IGMP Snooping Querier

Disabled

Query Interval

60 seconds

Maximum Response Time

10 seconds

Last Member Query Interval

1 second

Last Member Query Count

General Query Source IP

0.0.0.0

Static Router Ports

None

Forbidden Router Ports

None

IGMP Snooping

Enabled

Fast Leave

Disabled

Configuration Guide

Configuring Layer 2 Multicast

Function

Parameter

Default Setting

Static Multicast Group
Settings

Static Multicast Group Entries

None

IGMP Accounting

Disabled

IGMP Authentication

Disabled

IGMP Accounting and
Authentication

8.2

Appendix: Default Parameters

Default Parameters for MLD Snooping
Table 8-2

Default Parameters of MLD Snooping

Function
Global Settings of IGMP
Snooping

MLD Snooping Settings in the
VLAN

MLD Snooping Settings on
the Port and LAG

Parameter

Default Setting

MLD Snooping

Disabled

Unknown Multicast Groups

Forward

MLD Snooping

Disabled

Fast Leave

Disabled

Report Suppression

Disabled

Member Port Aging Time

260 seconds

Router Port Aging Time

300 seconds

Leave Time

1 second

MLD Snooping Querier

Disabled

Query Interval

60 seconds

Maximum Response Time

10 seconds

Last Listener Query Interval

1 second

Last Listener Query Count

General Query Source IP

Static Router Ports

None

Forbidden Router Ports

None

MLD Snooping

Enabled

Fast Leave

Disabled

Configuration Guide

Configuring Layer 2 Multicast

8.3

Function

Parameter

Default Setting

Static Multicast Group
Settings

Static Multicast Group Entries

None

Default Parameters for MVR
Table 8-3

Default Parameters of MVR

Function

Global Settings of MVR

MVR Group Settings

MVR Settings on the Port

MVR Static Group Members

8.4

Appendix: Default Parameters

Parameter

Default Setting

MVR

Disabled

MVR Mode

Compatible

Multicast VLAN ID

Query Response Time

5 tenths of a second

Maximum Multicast Groups

256

MVR Group Entries

None

MVR Mode

Disabled

MVR Port Type

None

Fast Leave

Disabled

MVR Static Group Member Entries

None

Default Parameters for Multicast Filtering
Table 8-4

Default Parameters of Multicast Filtering

Function

Parameter

Default Setting

Profile Settings

IPv4 Profile and IPv6 Profile Entries

None

Configuration Guide

Configuring Layer 2 Multicast

Function

Multicast Filtering Settings on
the Port and LAG

Appendix: Default Parameters

Parameter

Default Setting

Bound Profile

None

Maximum Groups

For T2600G and T1600G
series switches except
T1600G-28TS V3, the
default value is 1000.
For other switches, the
default value is 511.

Overflow Action

Drop

Configuration Guide

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