Configuring IGMP.. Snooping And Multicast VLAN Registration 32573 B Mc 1522e 2960xr Cg Chapter 01001

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring IGMP Snooping and Multicast VLAN

Registration

•Finding Feature Information, page 1

•Prerequisites for Configuring IGMP Snooping and MVR, page 1

•Restrictions for Configuring IGMP Snooping and MVR, page 2

•Information About IGMP Snooping and MVR, page 4

•How to Configure IGMP Snooping and MVR, page 14

•Monitoring IGMP Snooping and MVR, page 45

•Configuration Examples for IGMP Snooping and MVR, page 47

•Additional References, page 50

•Feature History and Information for IGMP Snooping, page 51

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and

feature information, see Bug Search Tool and the release notes for your platform and software release. To

find information about the features documented in this module, and to see a list of the releases in which each

feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support.

To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Prerequisites for Configuring IGMP Snooping and MVR

Prerequisites for IGMP Snooping

Observe these guidelines when configuring the IGMP snooping querier:

•Configure the VLAN in global configuration mode.

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•Configure an IP address on the VLAN interface. When enabled, the IGMP snooping querier uses the IP

address as the query source address.

•If there is no IP address configured on the VLAN interface, the IGMP snooping querier tries to use the

configured global IP address for the IGMP querier. If there is no global IP address specified, the IGMP

querier tries to use the VLAN switch virtual interface (SVI) IP address (if one exists). If there is no SVI

IP address, the switch uses the first available IP address configured on the switch. The first IP address

available appears in the output of the show ip interface privileged EXEC command. The IGMP snooping

querier does not generate an IGMP general query if it cannot find an available IP address on the switch.

•The IGMP snooping querier supports IGMP Versions 1 and 2.

•When administratively enabled, the IGMP snooping querier moves to the nonquerier state if it detects

the presence of a multicast router in the network.

•When it is administratively enabled, the IGMP snooping querier moves to the operationally disabled

state under these conditions:

◦IGMP snooping is disabled in the VLAN.

◦PIM is enabled on the SVI of the corresponding VLAN.

Related Topics

Configuring the IGMP Snooping Querier , on page 29

IGMP Snooping, on page 4

Restrictions for Configuring IGMP Snooping and MVR

Restrictions for IGMP Snooping

The following are the restrictions for IGMP snooping:

•The switch supports homogeneous stacking, but does not support mixed stacking.

•The switch supports IGMPv3 snooping based only on the destination multicast MAC address. It does

not support snooping based on the source MAC address or on proxy reports.

•IGMPv3 join and leave messages are not supported on switches running IGMP filtering or Multicast

VLAN registration (MVR).

•IGMP report suppression is supported only when the multicast query has IGMPv1 and IGMPv2 reports.

This feature is not supported when the query includes IGMPv3 reports.

•The IGMP configurable leave time is only supported on hosts running IGMP Version 2. IGMP version

2 is the default version for the switch.

The actual leave latency in the network is usually the configured leave time. However, the leave time

might vary around the configured time, depending on real-time CPU load conditions, network delays

and the amount of traffic sent through the interface.

•The IGMP throttling action restriction can be applied only to Layer 2 ports. You can use ip igmp

max-groups action replace interface configuration command on a logical EtherChannel interface but

cannot use it on ports that belong to an EtherChannel port group.

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Restrictions for Configuring IGMP Snooping and MVR

When the maximum group limitation is set to the default (no maximum), entering the ip igmp max-groups

action {deny |replace} command has no effect.

If you configure the throttling action and set the maximum group limitation after an interface has added

multicast entries to the forwarding table, the forwarding-table entries are either aged out or removed,

depending on the throttling action.

Related Topics

IGMP Versions

Configuring IGMP Profiles , on page 37

Applying IGMP Profiles , on page 40

Setting the Maximum Number of IGMP Groups , on page 41

Configuring the IGMP Throttling Action , on page 43

IGMP Filtering and Throttling, on page 12

Restrictions for MVR

The following are restrictions for MVR:

•Only Layer 2 ports participate in MVR. You must configure ports as MVR receiver ports.

•Only one MVR multicast VLAN per switch or switch stack is supported.

•Receiver ports can only be access ports; they cannot be trunk ports. Receiver ports on a switch can be

in different VLANs, but should not belong to the multicast VLAN.

•The maximum number of multicast entries (MVR group addresses) that can be configured on a switch

(that is, the maximum number of television channels that can be received) is 256.

•MVR multicast data received in the source VLAN and leaving from receiver ports has its time-to-live

(TTL) decremented by 1 in the switch.

•Because MVR on the switch uses IP multicast addresses instead of MAC multicast addresses, alias IP

multicast addresses are allowed on the switch. However, if the switch is interoperating with Catalyst

3550 or Catalyst 3500 XL switches, you should not configure IP addresses that alias between themselves

or with the reserved IP multicast addresses (in the range 224.0.0.xxx).

•Do not configure MVR on private VLAN ports.

•MVR is not supported when multicast routing is enabled on a switch. If you enable multicast routing

and a multicast routing protocol while MVR is enabled, MVR is disabled, and you receive a warning

message. If you try to enable MVR while multicast routing and a multicast routing protocol are enabled,

the operation to enable MVR is cancelled, and you receive an error message

•MVR data received on an MVR receiver port is not forwarded to MVR source ports.

•MVR does not support IGMPv3 messages.

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Restrictions for MVR

Information About IGMP Snooping and MVR

IGMP Snooping

Layer 2 switches can use IGMP snooping to constrain the flooding of multicast traffic by dynamically

configuring Layer 2 interfaces so that multicast traffic is forwarded to only those interfaces associated with

IP multicast devices. As the name implies, IGMP snooping requires the LAN switch to snoop on the IGMP

transmissions between the host and the router and to keep track of multicast groups and member ports. When

the switch receives an IGMP report from a host for a particular multicast group, the switch adds the host port

number to the forwarding table entry; when it receives an IGMP Leave Group message from a host, it removes

the host port from the table entry. It also periodically deletes entries if it does not receive IGMP membership

reports from the multicast clients.

For more information on IP multicast and IGMP, see RFC 1112 and RFC 2236.Note

The multicast router ) sends out periodic general queries to all VLANs. All hosts interested in this multicast

traffic send join requests and are added to the forwarding table entry. The switch creates one entry per VLAN

in the IGMP snooping IP multicast forwarding table for each group from which it receives an IGMP join

request.

The switch supports IP multicast group-based bridging, instead of MAC-addressed based groups. With

multicast MAC address-based groups, if an IP address being configured translates (aliases) to a previously

configured MAC address or to any reserved multicast MAC addresses (in the range 224.0.0.xxx), the command

fails. Because the switch uses IP multicast groups, there are no address aliasing issues.

The IP multicast groups learned through IGMP snooping are dynamic. However, you can statically configure

multicast groups by using the ip igmp snooping vlan vlan-id static ip_address interface interface-id global

configuration command. If you specify group membership for a multicast group address statically, your setting

supersedes any automatic manipulation by IGMP snooping. Multicast group membership lists can consist of

both user-defined and IGMP snooping-learned settings.

You can configure an IGMP snooping querier to support IGMP snooping in subnets without multicast interfaces

because the multicast traffic does not need to be routed.

If a port spanning-tree, a port group, or a VLAN ID change occurs, the IGMP snooping-learned multicast

groups from this port on the VLAN are deleted.

These sections describe IGMP snooping characteristics:

Related Topics

Configuring the IGMP Snooping Querier , on page 29

Prerequisites for IGMP Snooping, on page 1

Example: Setting the IGMP Snooping Querier Source Address, on page 48

Example: Setting the IGMP Snooping Querier Maximum Response Time, on page 48

Example: Setting the IGMP Snooping Querier Timeout, on page 49

Example: Setting the IGMP Snooping Querier Feature, on page 49

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IGMP Versions

The switch supports IGMP version 1, IGMP version 2, and IGMP version 3. These versions are interoperable

on the switch. For example, if IGMP snooping is enabled and the querier's version is IGMPv2, and the switch

receives an IGMPv3 report from a host, then the switch can forward the IGMPv3 report to the multicast router.

An IGMPv3 switch can receive messages from and forward messages to a device running the Source Specific

Multicast (SSM) feature.

Related Topics

Changing the IGMP Version

Restrictions for IGMP Snooping, on page 2

Joining a Multicast Group

When a host connected to the switch wants to join an IP multicast group and it is an IGMP version 2 client,

it sends an unsolicited IGMP join message, specifying the IP multicast group to join. Alternatively, when the

switch receives a general query from the router, it forwards the query to all ports in the VLAN. IGMP version

1 or version 2 hosts wanting to join the multicast group respond by sending a join message to the switch. The

switch CPU creates a multicast forwarding-table entry for the group if it is not already present. The CPU also

adds the interface where the join message was received to the forwarding-table entry. The host associated

with that interface receives multicast traffic for that multicast group.

Figure 1: Initial IGMP Join Message

Router A sends a general query to the switch, which forwards the query to ports 2 through 5, all of which are

members of the same VLAN. Host 1 wants to join multicast group 224.1.2.3 and multicasts an IGMP

membership report (IGMP join message) to the group. The switch CPU uses the information in the IGMP

report to set up a forwarding-table entry that includes the port numbers connected to Host 1 and to the router.

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IGMP Snooping

Table 1: IGMP Snooping Forwarding Table

PortsType of PacketDestination Address

1, 2IGMP224.1.2.3

The switch hardware can distinguish IGMP information packets from other packets for the multicast group.

The information in the table tells the switching engine to send frames addressed to the 224.1.2.3 multicast IP

address that are not IGMP packets to the router and to the host that has joined the group.

If another host (for example, Host 4) sends an unsolicited IGMP join message for the same group, the CPU

receives that message and adds the port number of Host 4 to the forwarding table. Because the forwarding

table directs IGMP messages only to the CPU, the message is not flooded to other ports on the switch. Any

known multicast traffic is forwarded to the group and not to the CPU.

Figure 2: Second Host Joining a Multicast Group

Table 2: Updated IGMP Snooping Forwarding Table

PortsType of PacketDestination Address

1, 2, 5IGMP224.1.2.3

Related Topics

Configuring a Host Statically to Join a Group , on page 19

Example: Configuring a Host Statically to Join a Group, on page 48

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IGMP Snooping

Leaving a Multicast Group

The router sends periodic multicast general queries, and the switch forwards these queries through all ports

in the VLAN. Interested hosts respond to the queries. If at least one host in the VLAN wants to receive

multicast traffic, the router continues forwarding the multicast traffic to the VLAN. The switch forwards

multicast group traffic only to those hosts listed in the forwarding table for that IP multicast group maintained

by IGMP snooping.

When hosts want to leave a multicast group, they can silently leave, or they can send a leave message. When

the switch receives a leave message from a host, it sends a group-specific query to learn if any other devices

connected to that interface are interested in traffic for the specific multicast group. The switch then updates

the forwarding table for that MAC group so that only those hosts interested in receiving multicast traffic for

the group are listed in the forwarding table. If the router receives no reports from a VLAN, it removes the

group for the VLAN from its IGMP cache.

Immediate Leave

The switch uses IGMP snooping Immediate Leave to remove from the forwarding table an interface that sends

a leave message without the switch sending group-specific queries to the interface. The VLAN interface is

pruned from the multicast tree for the multicast group specified in the original leave message. Immediate

Leave ensures optimal bandwidth management for all hosts on a switched network, even when multiple

multicast groups are simultaneously in use.

Immediate Leave is only supported on IGMP version 2 hosts. IGMP version 2 is the default version for the

switch.

You should use the Immediate Leave feature only on VLANs where a single host is connected to each

port. If Immediate Leave is enabled on VLANs where more than one host is connected to a port, some

hosts may be dropped inadvertently.

Note

Related Topics

Enabling IGMP Immediate Leave , on page 21

Example: Enabling IGMP Immediate Leave, on page 48

IGMP Configurable-Leave Timer

You can configure the time that the switch waits after sending a group-specific query to determine if hosts

are still interested in a specific multicast group. The IGMP leave response time can be configured from 100

to 32767 milliseconds.

Related Topics

Configuring the IGMP Leave Timer , on page 23

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IGMP Snooping

IGMP Report Suppression

IGMP report suppression is supported only when the multicast query has IGMPv1 and IGMPv2 reports.

This feature is not supported when the query includes IGMPv3 reports.

Note

The switch uses IGMP report suppression to forward only one IGMP report per multicast router query to

multicast devices. When IGMP report suppression is enabled (the default), the switch sends the first IGMP

report from all hosts for a group to all the multicast routers. The switch does not send the remaining IGMP

reports for the group to the multicast routers. This feature prevents duplicate reports from being sent to the

multicast devices.

If the multicast router query includes requests only for IGMPv1 and IGMPv2 reports, the switch forwards

only the first IGMPv1 or IGMPv2 report from all hosts for a group to all the multicast routers.

If the multicast router query also includes requests for IGMPv3 reports, the switch forwards all IGMPv1,

IGMPv2, and IGMPv3 reports for a group to the multicast devices.

If you disable IGMP report suppression, all IGMP reports are forwarded to the multicast routers.

Related Topics

Disabling IGMP Report Suppression , on page 31

IGMP Snooping and Switch Stacks

IGMP snooping functions across the switch stack; that is, IGMP control information from one switch is

distributed to all switches in the stack. Regardless of the stack member through which IGMP multicast data

enters the stack, the data reaches the hosts that have registered for that group.

If a switch in the stack fails or is removed from the stack, only the members of the multicast group that are

on that switch will not receive the multicast data. All other members of a multicast group on other switches

in the stack continue to receive multicast data streams. However, multicast groups that are common for both

Layer 2 and Layer 3 (IP multicast routing) might take longer to converge if the active switch is removed.

Default IGMP Snooping Configuration

This table displays the default IGMP snooping configuration for the switch.

Table 3: Default IGMP Snooping Configuration

Default SettingFeature

Enabled globally and per VLANIGMP snooping

None configuredMulticast routers

DisabledIGMP snooping Immediate Leave

None configuredStatic groups

2TCN1flood query count

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IGMP Snooping

Default SettingFeature

DisabledTCN query solicitation

DisabledIGMP snooping querier

EnabledIGMP report suppression

1(1) TCN = Topology Change Notification

Related Topics

Enabling or Disabling IGMP Snooping on a Switch , on page 14

Enabling or Disabling IGMP Snooping on a VLAN Interface, on page 15

Multicast VLAN Registration

Multicast VLAN Registration (MVR) is designed for applications using wide-scale deployment of multicast

traffic across an Ethernet ring-based service-provider network (for example, the broadcast of multiple television

channels over a service-provider network). MVR allows a subscriber on a port to subscribe and unsubscribe

to a multicast stream on the network-wide multicast VLAN. It allows the single multicast VLAN to be shared

in the network while subscribers remain in separate VLANs. MVR provides the ability to continuously send

multicast streams in the multicast VLAN, but to isolate the streams from the subscriber VLANs for bandwidth

and security reasons.

These sections describe MVR:

MVR and IGMP

MVR can coexist with IGMP snooping on a switch.Note

MVR assumes that subscriber ports subscribe and unsubscribe (join and leave) these multicast streams by

sending out IGMP join and leave messages. These messages can originate from an IGMP version-2-compatible

host with an Ethernet connection. Although MVR operates on the underlying method of IGMP snooping, the

two features operate independently of each other. One can be enabled or disabled without affecting the behavior

of the other feature. However, if IGMP snooping and MVR are both enabled, MVR reacts only to join and

leave messages from multicast groups configured under MVR. Join and leave messages from all other multicast

groups are managed by IGMP snooping.

The switch CPU identifies the MVR IP multicast streams and their associated IP multicast group in the switch

forwarding table, intercepts the IGMP messages, and modifies the forwarding table to include or remove the

subscriber as a receiver of the multicast stream, even though the receivers might be in a different VLAN from

the source. This forwarding behavior selectively allows traffic to cross between different VLANs.

Modes of Operation

You can set the switch for compatible or dynamic mode of MVR operation:

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•In compatible mode, multicast data received by MVR hosts is forwarded to all MVR data ports, regardless

of MVR host membership on those ports. The multicast data is forwarded only to those receiver ports

that MVR hosts have joined, either by IGMP reports or by MVR static configuration. IGMP reports

received from MVR hosts are never forwarded from MVR data ports that were configured in the switch.

•In dynamic mode, multicast data received by MVR hosts on the switch is forwarded from only those

MVR data and client ports that the MVR hosts have joined, either by IGMP reports or by MVR static

configuration. Any IGMP reports received from MVR hosts are also forwarded from all the MVR data

ports in the host. This eliminates using unnecessary bandwidth on MVR data port links, which occurs

when the switch runs in compatible mode.

MVR and Switch Stacks

Only one MVR multicast VLAN per switch or switch stack is supported.

Receiver ports and source ports can be on different switches in a switch stack. Multicast data sent on the

multicast VLAN is forwarded to all MVR receiver ports across the stack. When a new switch is added to a

stack, by default it has no receiver ports.

If a switch fails or is removed from the stack, only those receiver ports belonging to that switch will not receive

the multicast data. All other receiver ports on other switches continue to receive the multicast data.

MVR in a Multicast Television Application

In a multicast television application, a PC or a television with a set-top box can receive the multicast stream.

Multiple set-top boxes or PCs can be connected to one subscriber port, which is a switch port configured as

an MVR receiver port.

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Multicast VLAN Registration

The following is an example configuration.

Figure 3: Multicast VLAN Registration Example

In this example configuration, DHCP assigns an IP address to the set-top box or the PC. When a subscriber

selects a channel, the set-top box or PC sends an IGMP report to Switch A to join the appropriate multicast.

If the IGMP report matches one of the configured IP multicast group addresses, the switch CPU modifies the

hardware address table to include this receiver port and VLAN as a forwarding destination of the specified

multicast stream when it is received from the multicast VLAN. Uplink ports that send and receive multicast

data to and from the multicast VLAN are called MVR source ports.

When a subscriber changes channels or turns off the television, the set-top box sends an IGMP leave message

for the multicast stream. The switch CPU sends a MAC-based general query through the receiver port VLAN.

If there is another set-top box in the VLAN still subscribing to this group, that set-top box must respond within

the maximum response time specified in the query. If the CPU does not receive a response, it eliminates the

receiver port as a forwarding destination for this group.

Without Immediate Leave, when the switch receives an IGMP leave message from a subscriber on a receiver

port, it sends out an IGMP query on that port and waits for IGMP group membership reports. If no reports

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are received in a configured time period, the receiver port is removed from multicast group membership. With

Immediate Leave, an IGMP query is not sent from the receiver port on which the IGMP leave was received.

As soon as the leave message is received, the receiver port is removed from multicast group membership,

which speeds up leave latency. Enable the Immediate-Leave feature only on receiver ports to which a single

receiver device is connected.

MVR eliminates the need to duplicate television-channel multicast traffic for subscribers in each VLAN.

Multicast traffic for all channels is only sent around the VLAN trunk once—only on the multicast VLAN.

The IGMP leave and join messages are in the VLAN to which the subscriber port is assigned. These messages

dynamically register for streams of multicast traffic in the multicast VLAN on the Layer 3 device. The access

layer switch, Switch A, modifies the forwarding behavior to allow the traffic to be forwarded from the multicast

VLAN to the subscriber port in a different VLAN, selectively allowing traffic to cross between two VLANs.

IGMP reports are sent to the same IP multicast group address as the multicast data. The Switch A CPU must

capture all IGMP join and leave messages from receiver ports and forward them to the multicast VLAN of

the source (uplink) port, based on the MVR mode.

Default MVR Configuration

Table 4: Default MVR Configuration

Default SettingFeature

Disabled globally and per interfaceMVR

None configuredMulticast addresses

0.5 secondQuery response time

VLAN 1Multicast VLAN

CompatibleMode

Neither a receiver nor a source portInterface (per port) default

Disabled on all portsImmediate Leave

IGMP Filtering and Throttling

In some environments, for example, metropolitan or multiple-dwelling unit (MDU) installations, you might

want to control the set of multicast groups to which a user on a switch port can belong. You can control the

distribution of multicast services, such as IP/TV, based on some type of subscription or service plan. You

might also want to limit the number of multicast groups to which a user on a switch port can belong.

With the IGMP filtering feature, you can filter multicast joins on a per-port basis by configuring IP multicast

profiles and associating them with individual switch ports. An IGMP profile can contain one or more multicast

groups and specifies whether access to the group is permitted or denied. If an IGMP profile denying access

to a multicast group is applied to a switch port, the IGMP join report requesting the stream of IP multicast

traffic is dropped, and the port is not allowed to receive IP multicast traffic from that group. If the filtering

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IGMP Filtering and Throttling

action permits access to the multicast group, the IGMP report from the port is forwarded for normal processing.

You can also set the maximum number of IGMP groups that a Layer 2 interface can join.

IGMP filtering controls only group-specific query and membership reports, including join and leave reports.

It does not control general IGMP queries. IGMP filtering has no relationship with the function that directs

the forwarding of IP multicast traffic. The filtering feature operates in the same manner whether CGMP or

MVR is used to forward the multicast traffic.

IGMP filtering applies only to the dynamic learning of IP multicast group addresses, not static configuration.

With the IGMP throttling feature, you can set the maximum number of IGMP groups that a Layer 2 interface

can join. If the maximum number of IGMP groups is set, the IGMP snooping forwarding table contains the

maximum number of entries, and the interface receives an IGMP join report, you can configure an interface

to drop the IGMP report or to replace the randomly selected multicast entry with the received IGMP report.

IGMPv3 join and leave messages are not supported on switches running IGMP filtering.Note

Related Topics

Configuring IGMP Profiles , on page 37

Applying IGMP Profiles , on page 40

Setting the Maximum Number of IGMP Groups , on page 41

Configuring the IGMP Throttling Action , on page 43

Restrictions for IGMP Snooping, on page 2

Default IGMP Filtering and Throttling Configuration

This table displays the default IGMP filtering and throttling configuration for the switch.

Table 5: Default IGMP Filtering Configuration

Default SettingFeature

None applied.IGMP filters

No maximum set.

When the maximum number of groups is in the

forwarding table, the default IGMP throttling action

is to deny the IGMP report.

Note

IGMP maximum number of IGMP groups

None defined.IGMP profiles

Deny the range addresses.IGMP profile action

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IGMP Filtering and Throttling

How to Configure IGMP Snooping and MVR

Enabling or Disabling IGMP Snooping on a Switch

When IGMP snooping is globally enabled or disabled, it is also enabled or disabled in all existing VLAN

interfaces. IGMP snooping is enabled on all VLANs by default, but can be enabled and disabled on a per-VLAN

basis.

Global IGMP snooping overrides the VLAN IGMP snooping. If global snooping is disabled, you cannot

enable VLAN snooping. If global snooping is enabled, you can enable or disable VLAN snooping.

Follow these steps to globally enable IGMP snooping on the switch:

SUMMARY STEPS

1. enable

2. configure terminal

3. ip igmp snooping

4. end

5. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if

prompted.

enable

Example:

Switch> enable

Step 1

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Globally enables IGMP snooping in all existing VLAN

interfaces.

ip igmp snooping

Example:

Switch(config)# ip igmp snooping

Step 3

To globally disable IGMP snooping on all VLAN

interfaces, use the no ip igmp snooping global

configuration command.

Note

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 4

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PurposeCommand or Action

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config startup-config

Step 5

Related Topics

Default IGMP Snooping Configuration, on page 8

Enabling or Disabling IGMP Snooping on a VLAN Interface

Follow these steps to enable IGMP snooping on a VLAN interface:

SUMMARY STEPS

1. enable

2. configure terminal

3. ip igmp snooping vlan vlan-id

4. end

5. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if prompted.enable

Step 1

Example:

Switch> enable

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

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Configuring IGMP Snooping and Multicast VLAN Registration

Enabling or Disabling IGMP Snooping on a VLAN Interface

PurposeCommand or Action

Enables IGMP snooping on the VLAN interface. The VLAN ID

range is 1 to 1001 and 1006 to 4094.

ip igmp snooping vlan vlan-id

Example:

Switch(config)# ip igmp snooping vlan 7

Step 3

IGMP snooping must be globally enabled before you can enable

VLAN snooping.

To disable IGMP snooping on a VLAN interface, use the

no ip igmp snooping vlan vlan-id global configuration

command for the specified VLAN number.

Note

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 4

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config

Step 5

startup-config

Related Topics

Default IGMP Snooping Configuration, on page 8

Setting the Snooping Method

Multicast-capable router ports are added to the forwarding table for every Layer 2 multicast entry. The switch

learns of the ports through one of these methods:

•Snooping on IGMP queries, Protocol-Independent Multicast (PIM) packets, and Distance Vector Multicast

Routing Protocol (DVMRP) packets.

•Listening to Cisco Group Management Protocol (CGMP) packets from other routers.

•Statically connecting to a multicast router port using the ip igmp snooping mrouter global configuration

command.

You can configure the switch either to snoop on IGMP queries and PIM/DVMRP packets or to listen to CGMP

self-join or proxy-join packets. By default, the switch snoops on PIM/DVMRP packets on all VLANs. To

learn of multicast router ports through only CGMP packets, use the ip igmp snooping vlan vlan-id mrouter

learn cgmp global configuration command. When this command is entered, the router listens to only CGMP

self-join and CGMP proxy-join packets and to no other CGMP packets. To learn of multicast router ports

through only PIM-DVMRP packets, use the ip igmp snooping vlan vlan-id mrouter learn pim-dvmrp

global configuration command.

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Configuring IGMP Snooping and Multicast VLAN Registration

Setting the Snooping Method

If you want to use CGMP as the learning method and no multicast routers in the VLAN are CGMP

proxy-enabled, you must enter the ip cgmp router-only command to dynamically access the router.

SUMMARY STEPS

1. enable

2. configure terminal

3. ip igmp snooping vlan vlan-id mrouter learn {cgmp |pim-dvmrp }

4. end

5. show ip igmp snooping

6. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if

prompted.

enable

Example:

Switch> enable

Step 1

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Specifies the multicast router learning method:

ip igmp snooping vlan vlan-id mrouter learn

{cgmp |pim-dvmrp }

Step 3

•cgmp—Listens for CGMP packets. This method is useful

for reducing control traffic.

Example:

Switch(config)# ip igmp snooping

vlan 1 mrouter learn cgmp

•pim-dvmrp—Snoops on IGMP queries and PIM-DVMRP

packets. This is the default.

To return to the default learning method, use the no ip

igmp snooping vlan vlan-id mrouter learn cgmp

global configuration command.

Note

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 4

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Configuring IGMP Snooping and Multicast VLAN Registration

Setting the Snooping Method

PurposeCommand or Action

Verifies the configuration.show ip igmp snooping

Example:

Switch# show ip igmp snooping

Step 5

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config startup-config

Step 6

Configuring a Multicast Router Port

Perform these steps to add a multicast router port (enable a static connection to a multicast router) on the

switch.

Static connections to multicast routers are supported only on switch ports.Note

SUMMARY STEPS

1. enable

2. configure terminal

3. ip igmp snooping vlan vlan-id mrouter interface interface-id

4. end

5. show ip igmp snooping mrouter [vlan vlan-id]

6. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if

prompted.

enable

Example:

Switch> enable

Step 1

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring a Multicast Router Port

PurposeCommand or Action

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Specifies the multicast router VLAN ID and the interface to the

multicast router.

ip igmp snooping vlan vlan-id mrouter interface

interface-id

Step 3

Example:

Switch(config)# ip igmp snooping vlan 5

•The VLAN ID range is 1 to 1001 and 1006 to 4094.

•The interface can be a physical interface or a port channel.

The port-channel range is 1 to 128.

mrouter interface gigabitethernet1/0/1

To remove a multicast router port from the VLAN, use

the no ip igmp snooping vlan vlan-id mrouter

interface interface-id global configuration command.

Note

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 4

Verifies that IGMP snooping is enabled on the VLAN interface.

show ip igmp snooping mrouter [vlan vlan-id]

Example:

Switch# show ip igmp snooping mrouter vlan

Step 5

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config startup-config

Step 6

Related Topics

Example: Enabling a Static Connection to a Multicast Router, on page 47

Configuring a Host Statically to Join a Group

Hosts or Layer 2 ports normally join multicast groups dynamically, but you can also statically configure a

host on an interface.

Follow these steps to add a Layer 2 port as a member of a multicast group:

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring a Host Statically to Join a Group

SUMMARY STEPS

1. enable

2. configure terminal

3. ip igmp snooping vlan vlan-id static ip_address interface interface-id

4. end

5. show ip igmp snooping groups

6. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if prompted.enable

Step 1

Example:

Switch> enable

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Statically configures a Layer 2 port as a member of a multicast

group:

ip igmp snooping vlan vlan-id static ip_address

interface interface-id

Step 3

Example:

Switch(config)# ip igmp snooping vlan 105

•vlan-id is the multicast group VLAN ID. The range is 1 to

1001 and 1006 to 4094.

•ip-address is the group IP address.

static 230.0.0.1 interface

gigabitethernet1/0/1 •interface-id is the member port. It can be a physical interface

or a port channel (1 to 128).

To remove the Layer 2 port from the multicast group,

use the no ip igmp snooping vlan vlan-id static

mac-address interface interface-id global configuration

command.

Note

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 4

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring a Host Statically to Join a Group

PurposeCommand or Action

Verifies the member port and the IP address.show ip igmp snooping groups

Example:

Switch# show ip igmp snooping groups

Step 5

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config startup-config

Step 6

Related Topics

Joining a Multicast Group, on page 5

Example: Configuring a Host Statically to Join a Group, on page 48

Enabling IGMP Immediate Leave

When you enable IGMP Immediate Leave, the switch immediately removes a port when it detects an IGMP

Version 2 leave message on that port. You should use the Immediate-Leave feature only when there is a single

receiver present on every port in the VLAN.

Immediate Leave is supported only on IGMP Version 2 hosts. IGMP Version 2 is the default version for

the switch.

Note

SUMMARY STEPS

1. enable

2. configure terminal

3. ip igmp snooping vlan vlan-id immediate-leave

4. end

5. show ip igmp snooping vlan vlan-id

6. end

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Configuring IGMP Snooping and Multicast VLAN Registration

Enabling IGMP Immediate Leave

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if

prompted.

enable

Example:

Switch> enable

Step 1

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Enables IGMP Immediate Leave on the VLAN interface.

ip igmp snooping vlan vlan-id immediate-leave

Step 3

Example:

Switch(config)# ip igmp snooping vlan 21

To disable IGMP Immediate Leave on a VLAN, use

the no ip igmp snooping vlan vlan-id

immediate-leave global configuration command.

Note

immediate-leave

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 4

Verifies that Immediate Leave is enabled on the VLAN

interface.

show ip igmp snooping vlan vlan-id

Example:

Switch# show ip igmp snooping vlan 21

Step 5

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 6

Related Topics

Immediate Leave , on page 7

Example: Enabling IGMP Immediate Leave, on page 48

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Configuring IGMP Snooping and Multicast VLAN Registration

Enabling IGMP Immediate Leave

Configuring the IGMP Leave Timer

You can configure the leave time globally or on a per-VLAN basis. Follow these steps to enable the IGMP

configurable-leave timer:

SUMMARY STEPS

1. enable

2. configure terminal

3. ip igmp snooping last-member-query-interval time

4. ip igmp snooping vlan vlan-id last-member-query-interval time

5. end

6. show ip igmp snooping

7. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if prompted.enable

Step 1

Example:

Switch> enable

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Configures the IGMP leave timer globally. The range is 100 to

32767 milliseconds.

ip igmp snooping last-member-query-interval

time

Step 3

Example:

Switch(config)# ip igmp snooping

The default leave time is 1000 milliseconds.

To globally reset the IGMP leave timer to the default

setting, use the no ip igmp snooping

last-member-query-interval global configuration

command.

Note

last-member-query-interval 1000

(Optional) Configures the IGMP leave time on the VLAN interface.

The range is 100 to 32767 milliseconds.

ip igmp snooping vlan vlan-id

last-member-query-interval time

Step 4

Example:

Switch(config)# ip igmp snooping vlan 210

Configuring the leave time on a VLAN overrides the

globally configured timer.

Note

To remove the configured IGMP leave-time setting from

the specified VLAN, use the no ip igmp snooping vlan

vlan-id last-member-query-interval global configuration

command.

Note

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring the IGMP Leave Timer

PurposeCommand or Action

last-member-query-interval 1000

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 5

(Optional) Displays the configured IGMP leave time.show ip igmp snooping

Example:

Switch# show ip igmp snooping

Step 6

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config startup-config

Step 7

Related Topics

IGMP Configurable-Leave Timer, on page 7

Configuring TCN-Related Commands

Controlling the Multicast Flooding Time After a TCN Event

You can configure the number of general queries by which multicast data traffic is flooded after a topology

change notification (TCN) event. If you set the TCN flood query count to 1 the flooding stops after receiving

1 general query. If you set the count to 7, the flooding continues until 7 general queries are received. Groups

are relearned based on the general queries received during the TCN event.

Some examples of TCN events are when the client location is changed and the receiver is on same port that

was blocked but is now forwarding, and when a port goes down without sending a leave message.

Follow these steps to configure the TCN flood query count:

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring TCN-Related Commands

SUMMARY STEPS

1. enable

2. configure terminal

3. ip igmp snooping tcn flood query count count

4. end

5. show ip igmp snooping

6. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if

prompted.

enable

Example:

Switch> enable

Step 1

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Specifies the number of IGMP general queries for which the

multicast traffic is flooded.

ip igmp snooping tcn flood query count count

Example:

Switch(config)# ip igmp snooping tcn flood

Step 3

The range is 1 to 10. The default, the flooding query count is

query count 3 To return to the default flooding query count, use the

no ip igmp snooping tcn flood query count global

configuration command.

Note

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 4

Verifies the TCN settings.show ip igmp snooping

Example:

Switch# show ip igmp snooping

Step 5

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring TCN-Related Commands

PurposeCommand or Action

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config startup-config

Step 6

Recovering from Flood Mode

When a topology change occurs, the spanning-tree root sends a special IGMP leave message (also known as

global leave) with the group multicast address 0.0.0.0. However, you can enable the switch to send the global

leave message whether it is the spanning-tree root or not. When the router receives this special leave, it

immediately sends general queries, which expedite the process of recovering from the flood mode during the

TCN event. Leaves are always sent if the switch is the spanning-tree root regardless of this configuration.

Follow these steps to enable sending of leave messages:

SUMMARY STEPS

1. enable

2. configure terminal

3. ip igmp snooping tcn query solicit

4. end

5. show ip igmp snooping

6. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if

prompted.

enable

Example:

Switch> enable

Step 1

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring TCN-Related Commands

PurposeCommand or Action

Sends an IGMP leave message (global leave) to speed the

process of recovering from the flood mode caused during a

TCN event. By default, query solicitation is disabled.

ip igmp snooping tcn query solicit

Example:

Switch(config)# ip igmp snooping tcn query

Step 3

To return to the default query solicitation, use the no

ip igmp snooping tcn query solicit global

configuration command.

Note

solicit

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 4

Verifies the TCN settings.show ip igmp snooping

Example:

Switch# show ip igmp snooping

Step 5

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config startup-config

Step 6

Disabling Multicast Flooding During a TCN Event

When the switch receives a TCN, multicast traffic is flooded to all the ports until 2 general queries are received.

If the switch has many ports with attached hosts that are subscribed to different multicast groups, this flooding

might exceed the capacity of the link and cause packet loss. Follow these steps to control TCN flooding:

SUMMARY STEPS

1. enable

2. configure terminal

3. interface interface-id

4. no ip igmp snooping tcn flood

5. end

6. show ip igmp snooping

7. copy running-config startup-config

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring TCN-Related Commands

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if

prompted.

enable

Example:

Switch> enable

Step 1

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Specifies the interface to be configured, and enters interface

configuration mode.

interface interface-id

Example:

Switch(config)# interface gigabitethernet

Step 3

1/0/1

Disables the flooding of multicast traffic during a

spanning-tree TCN event.

no ip igmp snooping tcn flood

Example:

Switch(config-if)# no ip igmp snooping tcn

Step 4

By default, multicast flooding is enabled on an interface.

To re-enable multicast flooding on an interface, use

the ip igmp snooping tcn flood interface

configuration command.

Note

flood

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 5

Verifies the TCN settings.show ip igmp snooping

Example:

Switch# show ip igmp snooping

Step 6

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config startup-config

Step 7

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring TCN-Related Commands

Configuring the IGMP Snooping Querier

Follow these steps to enable the IGMP snooping querier feature in a VLAN:

SUMMARY STEPS

1. enable

2. configure terminal

3. ip igmp snooping querier

4. ip igmp snooping querier address ip_address

5. ip igmp snooping querier query-interval interval-count

6. ip igmp snooping querier tcn query [count count |interval interval]

7. ip igmp snooping querier timer expiry timeout

8. ip igmp snooping querier version version

9. end

10. show ip igmp snooping vlan vlan-id

11. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if

prompted.

enable

Example:

Switch> enable

Step 1

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Enables the IGMP snooping querier.ip igmp snooping querier

Example:

Switch(config)# ip igmp snooping querier

Step 3

(Optional) Specifies an IP address for the IGMP snooping

querier. If you do not specify an IP address, the querier tries

to use the global IP address configured for the IGMP querier.

ip igmp snooping querier address ip_address

Example:

Switch(config)# ip igmp snooping querier

Step 4

The IGMP snooping querier does not generate an

IGMP general query if it cannot find an IP address

on the switch.

Note

address 172.16.24.1

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring the IGMP Snooping Querier

PurposeCommand or Action

(Optional) Sets the interval between IGMP queriers. The

range is 1 to 18000 seconds.

ip igmp snooping querier query-interval

interval-count

Example:

Switch(config)# ip igmp snooping querier

Step 5

query-interval 30

(Optional) Sets the time between Topology Change

Notification (TCN) queries. The count range is 1 to 10. The

interval range is 1 to 255 seconds.

ip igmp snooping querier tcn query [count count |

interval interval]

Example:

Switch(config)# ip igmp snooping querier tcn

Step 6

query interval 20

(Optional) Sets the length of time until the IGMP querier

expires. The range is 60 to 300 seconds.

ip igmp snooping querier timer expiry timeout

Example:

Switch(config)# ip igmp snooping querier timer

Step 7

expiry 180

(Optional) Selects the IGMP version number that the querier

feature uses. Select 1 or 2.

ip igmp snooping querier version version

Example:

Switch(config)# ip igmp snooping querier

Step 8

version 2

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 9

(Optional) Verifies that the IGMP snooping querier is enabled

on the VLAN interface. The VLAN ID range is 1 to 1001

and 1006 to 4094.

show ip igmp snooping vlan vlan-id

Example:

Switch# show ip igmp snooping vlan 30

Step 10

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config startup-config

Step 11

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring the IGMP Snooping Querier

Related Topics

IGMP Snooping, on page 4

Prerequisites for IGMP Snooping, on page 1

Example: Setting the IGMP Snooping Querier Source Address, on page 48

Example: Setting the IGMP Snooping Querier Maximum Response Time, on page 48

Example: Setting the IGMP Snooping Querier Timeout, on page 49

Example: Setting the IGMP Snooping Querier Feature, on page 49

Disabling IGMP Report Suppression

Follow these steps to disable IGMP report suppression:

SUMMARY STEPS

1. enable

2. configure terminal

3. no ip igmp snooping report-suppression

4. end

5. show ip igmp snooping

6. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if prompted.enable

Step 1

Example:

Switch> enable

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Disables IGMP report suppression. When report suppression is

disabled, all IGMP reports are forwarded to the multicast routers.

no ip igmp snooping report-suppression

Example:

Switch(config)# no ip igmp snooping

Step 3

IGMP report suppression is enabled by default.

When IGMP report supression is enabled, the switch forwards only

one IGMP report per multicast router query.

To re-enable IGMP report suppression, use the ip igmp

snooping report-suppression global configuration

command.

Note

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Configuring IGMP Snooping and Multicast VLAN Registration

Disabling IGMP Report Suppression

PurposeCommand or Action

report-suppression

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 4

Verifies that IGMP report suppression is disabled.show ip igmp snooping

Example:

Switch# show ip igmp snooping

Step 5

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config startup-config

Step 6

Related Topics

IGMP Report Suppression, on page 8

Configuring MVR Global Parameters

You do not need to set the optional MVR parameters if you choose to use the default settings. If you want to

change the default parameters (except for the MVR VLAN), you must first enable MVR.

For complete syntax and usage information for the commands used in this section, see the command

reference for this release.

Note

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring MVR Global Parameters

SUMMARY STEPS

1. enable

2. configure terminal

3. mvr

4. mvr group ip-address [count]

5. mvr querytime value

6. mvr vlan vlan-id

7. mvr mode {dynamic |compatible}

8. end

9. Use one of the following:

•show mvr

•show mvr members

10. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if prompted.enable

Step 1

Example:

Switch> enable

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Enables MVR on the switch.mvr

Example:

Switch (config)# mvr

Step 3

Configures an IP multicast address on the switch or use the count parameter

to configure a contiguous series of MVR group addresses (the range for

mvr group ip-address [count]

Example:

Switch(config)# mvr group

Step 4

count is 1 to 256; the default is 1). Any multicast data sent to this address

is sent to all source ports on the switch and all receiver ports that have

elected to receive data on that multicast address. Each multicast address

would correspond to one television channel.

228.1.23.4

To return the switch to its default settings, use the no mvr [mode

|group ip-address |querytime |vlan] global configuration

commands.

Note

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring MVR Global Parameters

PurposeCommand or Action

(Optional) Defines the maximum time to wait for IGMP report

memberships on a receiver port before removing the port from multicast

mvr querytime value

Example:

Switch(config)# mvr querytime

Step 5

group membership. The value is in units of tenths of a second. The range

is 1 to 100, and the default is 5 tenths or one-half second.

(Optional) Specifies the VLAN in which multicast data is received; all

source ports must belong to this VLAN. The VLAN range is 1 to 1001

and 1006 to 4094. The default is VLAN 1.

mvr vlan vlan-id

Example:

Switch(config)# mvr vlan 22

Step 6

(Optional) Specifies the MVR mode of operation:mvr mode {dynamic |compatible}

Step 7

Example:

Switch(config)# mvr mode

•dynamic—Allows dynamic MVR membership on source ports.

•compatible—Is compatible with Catalyst 3500 XL and Catalyst 2900

XL switches and does not support IGMP dynamic joins on source

ports.

dynamic

The default is compatible mode.

To return the switch to its default settings, use the no mvr [mode

|group ip-address |querytime |vlan] global configuration

commands.

Note

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 8

Verifies the configuration.Use one of the following:

Step 9

•show mvr

•show mvr members

Example:

Switch# show mvr

Switch# show mvr members

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config

Step 10

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Configuring MVR Global Parameters

PurposeCommand or Action

startup-config

Configuring MVR Interfaces

Follow these steps to configure Layer 2 MVR interfaces:

SUMMARY STEPS

1. enable

2. configure terminal

3. mvr

4. interface interface-id

5. mvr type {source |receiver}

6. mvr vlan vlan-id group [ip-address]

7. mvr immediate

8. end

9. Use one of the following:

•show mvr

•show mvr interface

•show mvr members

10. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if prompted.enable

Step 1

Example:

Switch> enable

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

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Configuring MVR Interfaces

PurposeCommand or Action

Enables MVR on the switch.mvr

Example:

Switch (config)# mvr

Step 3

Specifies the Layer 2 port to configure, and enter interface configuration

mode.

interface interface-id

Example:

Switch(config)# interface

Step 4

gigabitethernet1/0/2

Configures an MVR port as one of these:mvr type {source |receiver}

Step 5

Example:

Switch(config-if)# mvr type receiver

•source—Configures uplink ports that receive and send multicast

data as source ports. Subscribers cannot be directly connected to

source ports. All source ports on a switch belong to the single

multicast VLAN.

•receiver—Configures a port as a receiver port if it is a subscriber

port and should only receive multicast data. It does not receive

data unless it becomes a member of the multicast group, either

statically or by using IGMP leave and join messages. Receiver

ports cannot belong to the multicast VLAN.

The default configuration is as a non-MVR port. If you attempt to

configure a non-MVR port with MVR characteristics, the operation fails.

To return the interface to its default settings, use the no mvr

[type |immediate |vlan vlan-id |group] interface configuration

commands.

Note

(Optional) Statically configures a port to receive multicast traffic sent

to the multicast VLAN and the IP multicast address. A port statically

mvr vlan vlan-id group [ip-address]

Example:

Switch(config-if)# mvr vlan 22 group

Step 6

configured as a member of a group remains a member of the group until

statically removed.

In compatible mode, this command applies to only receiver

ports. In dynamic mode, it applies to receiver ports and source

ports.

Note

Receiver ports can also dynamically join multicast groups by using IGMP

join and leave messages.

228.1.23.4

(Optional) Enables the Immediate-Leave feature of MVR on the port.mvr immediate

Step 7

Example:

Switch(config-if)# mvr immediate

This command applies to only receiver ports and should only

be enabled on receiver ports to which a single receiver device

is connected.

Note

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Configuring MVR Interfaces

PurposeCommand or Action

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 8

Verifies the configuration.Use one of the following:

Step 9

•show mvr

•show mvr interface

•show mvr members

Example:

Switch# show mvr interface

Port Type Status

Immediate Leave

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

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

Gi1/0/2 RECEIVER ACTIVE/DOWN

ENABLED

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config

Step 10

startup-config

Configuring IGMP Profiles

Follow these steps to create an IGMP profile:

This task is optional.

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring IGMP Profiles

SUMMARY STEPS

1. enable

2. configure terminal

3. ip igmp profile profile number

4. permit |deny

5. range ip multicast address

6. end

7. show ip igmp profile profile number

8. show running-config

9. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if prompted.enable

Step 1

Example:

Switch> enable

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Assigns a number to the profile you are configuring, and enters IGMP

profile configuration mode. The profile number range is 1 to 4294967295.

ip igmp profile profile number

Example:

Switch(config)# ip igmp profile 3

Step 3

When you are in IGMP profile configuration mode, you can create the

profile by using these commands:

•deny—Specifies that matching addresses are denied; this is the default.

•exit—Exits from igmp-profile configuration mode.

•no—Negates a command or returns to its defaults.

•permit—Specifies that matching addresses are permitted.

•range—Specifies a range of IP addresses for the profile. You can

enter a single IP address or a range with a start and an end address.

The default is for the switch to have no IGMP profiles configured.

To delete a profile, use the no ip igmp profile profile number

global configuration command.

Note

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Configuring IGMP Profiles

PurposeCommand or Action

(Optional) Sets the action to permit or deny access to the IP multicast

address. If no action is configured, the default for the profile is to deny

access.

permit |deny

Example:

Switch(config-igmp-profile)# permit

Step 4

Enters the IP multicast address or range of IP multicast addresses to which

access is being controlled. If entering a range, enter the low IP multicast

address, a space, and the high IP multicast address.

range ip multicast address

Example:

Switch(config-igmp-profile)# range

Step 5

You can use the range command multiple times to enter multiple addresses

or ranges of addresses.

229.9.9.0

To delete an IP multicast address or range of IP multicast addresses,

use the no range ip multicast address IGMP profile configuration

command.

Note

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 6

Verifies the profile configuration.

show ip igmp profile profile number

Example:

Switch# show ip igmp profile 3

Step 7

Verifies your entries.show running-config

Example:

Switch# show running-config

Step 8

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config

Step 9

startup-config

Related Topics

IGMP Filtering and Throttling, on page 12

Restrictions for IGMP Snooping, on page 2

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Configuring IGMP Snooping and Multicast VLAN Registration

Configuring IGMP Profiles

Applying IGMP Profiles

To control access as defined in an IGMP profile, you have to apply the profile to the appropriate interfaces.

You can apply IGMP profiles only to Layer 2 access ports; you cannot apply IGMP profiles to routed ports

or SVIs. You cannot apply profiles to ports that belong to an EtherChannel port group. You can apply a profile

to multiple interfaces, but each interface can have only one profile applied to it.

Follow these steps to apply an IGMP profile to a switch port:

SUMMARY STEPS

1. enable

2. configure terminal

3. interface interface-id

4. ip igmp filter profile number

5. end

6. show running-config

7. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if

prompted.

enable

Example:

Switch> enable

Step 1

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Specifies the physical interface, and enters interface

configuration mode. The interface must be a Layer 2 port that

does not belong to an EtherChannel port group.

interface interface-id

Example:

Switch(config)# interface

Step 3

gigabitethernet1/0/1

Applies the specified IGMP profile to the interface. The range

is 1 to 4294967295.

ip igmp filter profile number

Example:

Switch(config-if)# ip igmp filter 321

Step 4

To remove a profile from an interface, use the no ip

igmp filter profile number interface configuration

command.

Note

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Applying IGMP Profiles

PurposeCommand or Action

Returns to privileged EXEC mode.end

Example:

Switch(config-if)# end

Step 5

Verifies your entries.show running-config

Example:

Switch# show running-config

Step 6

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config startup-config

Step 7

Related Topics

IGMP Filtering and Throttling, on page 12

Restrictions for IGMP Snooping, on page 2

Setting the Maximum Number of IGMP Groups

Follow these steps to set the maximum number of IGMP groups that a Layer 2 interface can join:

Before You Begin

This restriction can be applied to Layer 2 ports only; you cannot set a maximum number of IGMP groups on

routed ports or SVIs. You also can use this command on a logical EtherChannel interface but cannot use it

on ports that belong to an EtherChannel port group.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface interface-id

4. ip igmp max-groups number

5. end

6. show running-config interface interface-id

7. copy running-config startup-config

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Setting the Maximum Number of IGMP Groups

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if

prompted.

enable

Example:

Switch> enable

Step 1

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Specifies the interface to be configured, and enters interface

configuration mode. The interface can be a Layer 2 port that

interface interface-id

Example:

Switch(config)# interface

Step 3

does not belong to an EtherChannel group or a EtherChannel

interface.

gigabitethernet1/0/2

Sets the maximum number of IGMP groups that the interface

can join. The range is 0 to 4294967294. The default is to have

no maximum set.

ip igmp max-groups number

Example:

Switch(config-if)# ip igmp max-groups 20

Step 4

To remove the maximum group limitation and return

to the default of no maximum, use the no ip igmp

max-groups interface configuration command.

Note

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 5

Verifies your entries.

show running-config interface interface-id

Example:

Switch# show running-config interface

Step 6

gigabitethernet1/0/1

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config startup-config

Step 7

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Setting the Maximum Number of IGMP Groups

Related Topics

IGMP Filtering and Throttling, on page 12

Restrictions for IGMP Snooping, on page 2

Configuring the IGMP Throttling Action

After you set the maximum number of IGMP groups that a Layer 2 interface can join, you can configure an

interface to replace the existing group with the new group for which the IGMP report was received.

Follow these steps to configure the throttling action when the maximum number of entries is in the forwarding

table:

SUMMARY STEPS

1. enable

2. configure terminal

3. interface interface-id

4. ip igmp max-groups action {deny |replace}

5. end

6. show running-config interface interface-id

7. copy running-config startup-config

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode. Enter your password if prompted.enable

Step 1

Example:

Switch> enable

Enters the global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 2

Specifies the physical interface to be configured, and enters interface

configuration mode. The interface can be a Layer 2 port that does not belong

interface interface-id

Example:

Switch(config)# interface

Step 3

to an EtherChannel group or an EtherChannel interface. The interface cannot

be a trunk port.

gigabitethernet 1/0/1

When an interface receives an IGMP report and the maximum number of

entries is in the forwarding table, specifies the action that the interface takes:

ip igmp max-groups action {deny |

replace}

Step 4

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Configuring the IGMP Throttling Action

PurposeCommand or Action

Example:

Switch(config-if)# ip igmp

•deny—Drops the report. If you configure this throttling action, the

entries that were previously in the forwarding table are not removed

but are aged out. After these entries are aged out and the maximum

number of entries is in the forwarding table, the switch drops the next

IGMP report received on the interface.

max-groups action replace

•replace—Replaces the existing group with the new group for which

the IGMP report was received. If you configure this throttling action,

the entries that were previously in the forwarding table are removed.

When the maximum number of entries is in the forwarding table, the

switch replaces a randomly selected entry with the received IGMP

report.

To prevent the switch from removing the forwarding-table entries, you can

configure the IGMP throttling action before an interface adds entries to the

forwarding table.

To return to the default action of dropping the report, use the no ip

igmp max-groups action interface configuration command.

Note

Returns to privileged EXEC mode.end

Example:

Switch(config)# end

Step 5

Verifies your entries.show running-config interface

interface-id

Step 6

Example:

Switch# show running-config

interface gigabitethernet1/0/1

(Optional) Saves your entries in the configuration file.copy running-config startup-config

Example:

Switch# copy running-config

Step 7

startup-config

Related Topics

IGMP Filtering and Throttling, on page 12

Restrictions for IGMP Snooping, on page 2

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Configuring the IGMP Throttling Action

Monitoring IGMP Snooping and MVR

Monitoring IGMP Snooping Information

You can display IGMP snooping information for dynamically learned and statically configured router ports

and VLAN interfaces. You can also display MAC address multicast entries for a VLAN configured for IGMP

snooping.

Table 6: Commands for Displaying IGMP Snooping Information

PurposeCommand

Displays the snooping configuration information for all VLANs

on the switch or for a specified VLAN.

(Optional) Enter vlan vlan-id to display information for a single

VLAN. The VLAN ID range is 1 to 1001 and 1006 to 4094.

show ip igmp snooping [vlan vlan-id

[detail] ]

Displays multicast table information for the switch or about a

specific parameter:

•count—Displays the total number of entries for the

specified command options instead of the actual entries.

•dynamic—Displays entries learned through IGMP

snooping.

•user—Displays only the user-configured multicast entries.

show ip igmp snooping groups [count

|dynamic [count] | user [count]]

Displays multicast table information for a multicast VLAN or

about a specific parameter for the VLAN:

•vlan-id—The VLAN ID range is 1 to 1001 and 1006 to

4094.

•count—Displays the total number of entries for the

specified command options instead of the actual entries.

•dynamic—Displays entries learned through IGMP

snooping.

•ip_address—Displays characteristics of the multicast

group with the specified group IP address.

•user—Displays only the user-configured multicast entries.

show ip igmp snooping groups vlan

vlan-id [ip_address |count |dynamic

[count] | user[count]]

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Configuring IGMP Snooping and Multicast VLAN Registration

Monitoring IGMP Snooping and MVR

PurposeCommand

Displays information on dynamically learned and manually

configured multicast router interfaces.

When you enable IGMP snooping, the switch

automatically learns the interface to which a multicast

router is connected. These are dynamically learned

interfaces.

Note

(Optional) Enter the vlan vlan-id to display information for a

particular VLAN.

show ip igmp snooping mrouter [vlan

vlan-id]

Displays information about the IP address and receiving port

of the most-recently received IGMP query message in the

VLAN and the configuration and operational state of the IGMP

snooping querier in the VLAN.

show ip igmp snooping querier [vlan

vlan-id]detail

Monitoring MVR

You can monitor MVR for the switch or for a specified interface by displaying the following MVR information.

Table 7: Commands for Displaying MVR Information

PurposeCommand

Displays MVR status and values for the switch—whether MVR is

enabled or disabled, the multicast VLAN, the maximum (256) and

current (0 through 256) number of multicast groups, the query

response time, and the MVR mode.

show mvr

Displays all MVR interfaces and their MVR configurations.

When a specific interface is entered, displays this information:

•Type—Receiver or Source

•Status—One of these:

◦Active means the port is part of a VLAN.

◦Up/Down means that the port is forwarding or

nonforwarding.

◦Inactive means that the port is not part of any VLAN.

•Immediate Leave—Enabled or Disabled

If the members keyword is entered, displays all multicast group

members on this port or, if a VLAN identification is entered, all

multicast group members on the VLAN. The VLAN ID range is 1

to 1001 and 1006 to 4094.

show mvr interface [interface-id]

[members [vlan vlan-id]]

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Monitoring MVR

PurposeCommand

Displays all receiver and source ports that are members of any IP

multicast group or the specified IP multicast group IP address.

show mvr members [ip-address]

Monitoring IGMP Filtering and Throttling Configuration

You can display IGMP profile characteristics, and you can display the IGMP profile and maximum group

configuration for all interfaces on the switch or for a specified interface. You can also display the IGMP

throttling configuration for all interfaces on the switch or for a specified interface.

Table 8: Commands for Displaying IGMP Filtering and Throttling Configuration

PurposeCommand

Displays the specified IGMP profile or all the

IGMP profiles defined on the switch.

show ip igmp profile [profile number]

Displays the configuration of the specified

interface or the configuration of all interfaces on

the switch, including (if configured) the

maximum number of IGMP groups to which an

interface can belong and the IGMP profile

applied to the interface.

show running-config [interface interface-id]

Configuration Examples for IGMP Snooping and MVR

Example: Configuring IGMP Snooping Using CGMP Packets

This example shows how to configure IGMP snooping to use CGMP packets as the learning method:

Switch# configure terminal

Switch(config)# ip igmp snooping vlan 1 mrouter learn cgmp

Switch(config)# end

Example: Enabling a Static Connection to a Multicast Router

This example shows how to enable a static connection to a multicast router:

Switch configure terminal

Switch ip igmp snooping vlan 200 mrouter interface gigabitethernet1/0/2

Switch end

Related Topics

Configuring a Multicast Router Port , on page 18

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Configuring IGMP Snooping and Multicast VLAN Registration

Monitoring IGMP Filtering and Throttling Configuration

Example: Configuring a Host Statically to Join a Group

This example shows how to statically configure a host on a port:

Switch# configure terminal

Switch# ip igmp snooping vlan 105 static 224.2.4.12 interface gigabitethernet1/0/1

Switch# end

Related Topics

Configuring a Host Statically to Join a Group , on page 19

Joining a Multicast Group, on page 5

Example: Enabling IGMP Immediate Leave

This example shows how to enable IGMP Immediate Leave on VLAN 130:

Switch# configure terminal

Switch(config)# ip igmp snooping vlan 130 immediate-leave

Switch(config)# end

Related Topics

Enabling IGMP Immediate Leave , on page 21

Immediate Leave , on page 7

Example: Setting the IGMP Snooping Querier Source Address

This example shows how to set the IGMP snooping querier source address to 10.0.0.64:

Switch# configure terminal

Switch(config)# ip igmp snooping querier 10.0.0.64

Switch(config)# end

Related Topics

Configuring the IGMP Snooping Querier , on page 29

IGMP Snooping, on page 4

Example: Setting the IGMP Snooping Querier Maximum Response Time

This example shows how to set the IGMP snooping querier maximum response time to 25 seconds:

Switch# configure terminal

Switch(config)# ip igmp snooping querier query-interval 25

Switch(config)# end

Related Topics

Configuring the IGMP Snooping Querier , on page 29

IGMP Snooping, on page 4

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Configuring IGMP Snooping and Multicast VLAN Registration

Example: Configuring a Host Statically to Join a Group

Example: Setting the IGMP Snooping Querier Timeout

This example shows how to set the IGMP snooping querier timeout to 60 seconds:

Switch# configure terminal

Switch(config)# ip igmp snooping querier timeout expiry 60

Switch(config)# end

Related Topics

Configuring the IGMP Snooping Querier , on page 29

IGMP Snooping, on page 4

Example: Setting the IGMP Snooping Querier Feature

This example shows how to set the IGMP snooping querier feature to Version 2:

Switch# configure terminal

Switch(config)# no ip igmp snooping querier version 2

Switch(config)# end

Related Topics

Configuring the IGMP Snooping Querier , on page 29

IGMP Snooping, on page 4

Example: Configuring IGMP Profiles

This example shows how to create IGMP profile 4 allowing access to the single IP multicast address and how

to verify the configuration. If the action was to deny (the default), it would not appear in the show ip igmp

profile output display.

Switch(config)# ip igmp profile 4

Switch(config-igmp-profile)# permit

Switch(config-igmp-profile)# range 229.9.9.0

Switch(config-igmp-profile)# end

Switch# show ip igmp profile 4

IGMP Profile 4

permit

range 229.9.9.0 229.9.9.0

Example: Applying IGMP Profile

This example shows how to apply IGMP profile 4 to a port:

Switch(config)# interface gigabitethernet1/0/2

Switch(config-if)# ip igmp filter 4

Switch(config-if)# end

Example: Setting the Maximum Number of IGMP Groups

This example shows how to limit to 25 the number of IGMP groups that a port can join:

Switch(config)# interface gigabitethernet1/0/2

Switch(config-if)# ip igmp max-groups 25

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Configuring IGMP Snooping and Multicast VLAN Registration

Example: Setting the IGMP Snooping Querier Timeout

Switch(config-if)# end

Example: Configuring MVR Global Parameters

This example shows how to enable MVR, configure the group address, set the query time to 1 second (10

tenths), specify the MVR multicast VLAN as VLAN 22, and set the MVR mode as dynamic:

Switch(config)# mvr

Switch(config)# mvr group 228.1.23.4

Switch(config)# mvr querytime 10

Switch(config)# mvr vlan 22

Switch(config)# mvr mode dynamic

Switch(config)# end

Example: Configuring MVR Interfaces

This example shows how to configure a port as a receiver port, statically configure the port to receive multicast

traffic sent to the multicast group address, configure Immediate Leave on the port, and verify the results:

Switch(config)# mvr

Switch(config)# interface gigabitethernet1/0/2

Switch(config-if)# mvr type receiver

Switch(config-if)# mvr vlan 22 group 228.1.23.4

Switch(config-if)# mvr immediate

Switch(config)# end

Switch# show mvr interface

Port Type Status Immediate Leave

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

Gi1/0/2 RECEIVER ACTIVE/DOWN ENABLED

Additional References

Configuring IGMP.. Snooping And Multicast VLAN Registration 32573 B Mc 1522e 2960xr Cg Chapter 01001

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