Managing Physical Interface

2018-03-22

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Managing Physical Interfaces
CHAPTERS
1. Physical Interface

2. Basic Parameters Configurations
3. Port Isolation Configurations

4. Loopback Detection Configuration
5. Configuration Examples

6. Appendix: Default Parameters

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.

Physical Interface

1.1

Overview
Interfaces are used to exchange data and interact with interfaces of other network devices.
Interfaces are classified into physical interfaces and Layer 3 interfaces.
 Physical interfaces are the ports on the switch panel. They forward packets based on
MAC address table.
 Layer 3 interfaces are used to forward IPv4 and IPv6 packets using static or dynamic
routing protocols. You can use Layer 3 interfaces for IP routing and inter-VLAN routing.
This chapter introduces the configurations for physical interfaces.

1.2

Supported Features
The switch supports the following features about physical interfaces:

Basic Parameters

You can configure port status, speed mode, duplex mode, flow control and other basic
parameters for ports.

Port Isolation

You can use this feature to restrict a specific port to send packets to only the ports in the
forwarding port list that you configure.

Loopback Detection

This function allows the switch to detect loops in the network. When a loop is detected on
a port or VLAN, the switch will display an alert on the management interface and block the
corresponding port or VLAN according to your configurations.

Basic Parameters Configurations

2.1

Using the GUI
Choose the menu L2 FEATURES > Switching > Port > Port Config to load the following
page.
Figure 2-1

Configuring Basic Parameters

Follow these steps to configure basic parameters for the ports:

1) Configure the MTU size of jumbo frames for all the ports, then click Apply.
Jumbo

Configure the size of jumbo frames. By default, it is 1518 bytes.
Generally, the MTU (Maximum Transmission Unit) size of a normal frame is 1518
bytes. If you want the switch supports to transmit frames of which the MTU size is
greater than 1518 bytes, you can configure the MTU size manually here.

2) Select one or more ports to configure the basic parameters. Then click Apply.
UNIT/LAGS

Click the UNIT number to configure physical ports. Click LAGS to configure LAGs.

Type

Displays the port type. Copper indicates an Ethernet port, and Fiber indicates an
SFP port.

Description

(Optional) Enter a description for the port.

Status

With this option enabled, the port forwards packets normally. Otherwise, the port
cannot work. By default, it is enabled.

Speed

Select the appropriate speed mode for the port. When Auto is selected, the
port automatically negotiates speed mode with the neighbor device. The default
setting is Auto. It is recommended to select Auto if both ends of the link support
auto-negotiation.

Duplex

Select the appropriate duplex mode for the port. There are three options: Half,
Full and Auto. The default setting is Auto.
Half: The port can send and receive packets, but only one-way at a time.
Full: The port can send and receive packets simultaneously.
Auto: The port automatically negotiates duplex mode with the peer device.

Flow Control

With this option enabled, when a device gets overloaded it will send a PAUSE
frame to notify the peer device to stop sending data for a specified period
of time, thus avoiding the packet loss caused by congestion. By default, it is
disabled.

Note:

We recommend that you set the ports on both ends of a link as the same speed and duplex mode.

2.2

Using the CLI
Follow these steps to set basic parameters for the ports.
Step 1

configure

Step 2

jumbo-size size

Enter global configuration mode.

Change the MTU (Maximum Transmission Unit) size to support jumbo frames. The default
MTU size for frames received and sent on all ports is 1518 bytes. To transmit jumbo
frames, you can manually configure MTU size of frames up to 9216 bytes.

size : Configure the MTU size of jumbo frames. The value ranges from 1518 to 9216bytes.
Step 3

interface { fastEthernet port | range fastEthernet port-list | gigabitEthernet port | range
gigabitEthernet port-list | ten-gigabitEthernet port | ten-range gigabitEthernet port-list |
port-channel port-channel | range port-channel port-channel-list |}
Enter interface configuration mode.

Step 4

Configure basic parameters for the port:
description string

Give a port description for identification.

string : Content of a port description, ranging from 1 to 16 characters.
shutdown
no shutdown

Use shutdown to disable the port, and use no shutdown to enable the port. When the
status is enabled, the port can forward packets normally, otherwise it will discard the
received packets. By default, all ports are enabled.

speed { 10 | 100 | 1000 | 10000 | auto }

Set the appropriate speed mode for the port.
10 | 100 | 1000 | 10000 | auto: Speed mode of the port. The options are subject to your
actual product. The device connected to the port should be in the same speed and duplex
mode with the port. When auto is selected, the speed mode will be determined by autonegotiation.
duplex { auto | full | half }

Set the appropriate duplex mode for the port.
auto | full | half: Duplex mode of the port. The device connected to the port should be in the
same speed and duplex mode with the port. When auto is selected, the duplex mode will be
determined by auto-negotiation.
flow-control

Enable the switch to synchronize the data transmission speed with the peer device,
avoiding the packet loss caused by congestion. By default, it is disabled.
Step 5

show interface configuration [ fastEthernet port | gigabitEthernet port | | tengigabitEthernet port | port-channel port-channel-id ]
Verify the configuration of the port or LAG.

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 implement the basic configurations of port1/0/1,
including setting a description for the port, configuring the jumbo frame, making the port
automatically negotiate speed and duplex with the neighboring port, and enabling the flowcontrol:
Switch#configure
Switch#jumbo-size 9216

Switch(config)#interface gigabitEthernet 1/0/1
Switch(config-if)#no shutdown
Switch(config-if)#description router connection
Switch(config-if)#speed auto
Switch(config-if)#duplex auto
Switch(config-if)#flow-control
Switch(config-if)#show interface configuration gigabitEthernet 1/0/1
Port

State

Speed

Duplex

FlowCtrl

Jumbo

Description

--------

-----

--------

------

--------

-----------

Gi1/0/1

Enable

Auto

Enable

Disable

router connection

Switch(config-if)#show jumbo-size
Global jumbo size : 9216
Switch(config-if)#end
Switch#copy running-config startup-config

Port Isolation Configurations

3.1

Using the GUI
Port Isolation is used to limit the data transmitted by a port. The isolated port can only send
packets to the ports specified in its forwarding Port list.
Choose the menu L2 FEATURES > Switching > Port > Port Isolation to load the following
page.
Figure 3-1

Port Isolation List

The above page displays the port isolation list. Click
the following page.

to configure Port Isolation on

Figure 3-2

Port Isolation

Follow these steps to configure Port Isolation:

1) In the Port section, select one or multiple ports to be isolated.

2) In the Forwarding Port List section, select the forwarding ports or LAGs which the
isolated ports can only communicate with. It is multi-optional.
3) Click Apply.

3.2

Using the CLI
Follow these steps to configure Port Isolation:
Step 1

configure

Step 2

Enter global configuration mode.

Specify the port to be isolated and enter interface configuration mode.

Step 3

port isolation { [fa-forward-list fa-forward-list ] [gi-forward-list gi-forward-list ] [te-forwardlist te-forward-list ] [ po-forward-list po-forward-list ] }
Add ports or LAGs to the forwarding port list of the isolated port. It is multi-optional.

fa-forward-list / gi-forward-list / te-forward-list : Specify the forwarding Ethernet ports.
po-forward-list: Specify the forwarding LAGs.
show port isolation interface { fastEthernet port | gigabitEthernet port | tengigabitEthernet port | port-channel port-channel }

Step 4

Verify the Port Isolation configuration of the specified port.

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 add ports 1/0/1-3 and LAG 4 to the forwarding list of
port 1/0/5:
Switch#configure
Switch(config)#interface gigabitEthernet 1/0/5
Switch(config-if)#port isolation gi-forward-list 1/0/1-3 po-forward-list 4
Switch(config-if)#show port isolation interface gigabitEthernet 1/0/5
Port

LAG

Forward-List

----

---

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

Gi1/0/5 N/A

Gi1/0/1-3,Po4

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

Loopback Detection Configuration

4.1

Using the GUI
To avoid broadcast storm, we recommend that you enable storm control before loopback
detection is enabled. To get detailed introductions about storm control, refer to Configuring
QoS_T1500&T1500G&T1600G (for T1500G-10PS v2, T1500G-8T v2, T1500G-10MPS v2,
T1500-28PCT v3, T1600G-18TS v2, T1600G-28TS v3, T1600G-28PS v3, T1600G-52TS
v4, T1600G-52PS v4) series switches; refer to Configuring QoS_T2600G&T1600G-52TS
v3&T1600G_52PS v3 (for T1600G-52TS v3, T1600G-52PS v3, T2600G-28TS v3, T2600G52ST v3, T2600G-28MPS v3, T2600G-28SQ v1).
Choose the menu L2 FEATURES > Switching > Port > Loopback Detection to load the
following page.
Figure 4-1

Configuring Loopback Detection

Follow these steps to configure loopback detection:

1) In the Loopback Detection section, enable loopback detection and configure the
global parameters. Then click Apply.
Loopback
Detection Status

Enable loopback detection globally.

Detection
Interval

Set the interval of sending loopback detection packets in seconds.

Auto-recovery
Time

Set the recovery time globally. The blocked port in Auto Recovery mode will
automatically be recovered to normal status after the Auto-recovery Time
expires. The value ranges from 2 to 100,000 in seconds, and the default value is
90.

Web Refresh
Status

With this option enabled, the switch will refresh the web timely. By default, it is
disabled.

Web Refresh
Interval

If you enabled web refresh status, set the refresh interval in seconds between 3
and 100. The default value is 6.

The valid value ranges from 1 to 1000 and the default value is 30.

2) In the Port Config section, select one or more ports to configure the loopback
detection parameters. Then click Apply.
Status

Enable loopback detection for the port.

Operation Mode

Select the operation mode when a loopback is detected on the port:
Alert: The Loop Status will display whether there is a loop detected on the
corresponding port. It is the default setting.
Port Based: In addition to displaying alerts, the switch will block the port on which
the loop is detected.
VLAN-Based: If a loop is detected in a VLAN on that port, in addition to displaying
alerts, the switch will block that VLAN. The traffic of the other VLANs can still be
normally forwarded by the port.

Recovery Mode

If you select Port Based or VLAN-Based as the operation mode, you also need to
configure the recovery mode for the blocked port:
Auto: The blocked port will automatically be recovered to normal status after the
automatic recovery time expires. It is the default setting.
Manual: You need to manually release the blocked port. Click Recovery to
release the selected port.

3) (Optional) View the loopback detection information.
Loop Status

Displays whether a loop is detected on the port.

Block Status

Displays whether the port is blocked.

Block VLAN

Displays the blocked VLANs.

4.2

Using the CLI
Follow these steps to configure loopback detection:
Step 1

configure

Step 2

loopback-detection

Step 3

loopback-detection interval interval-time

Enter global configuration mode.

Enable the loopback detection feature globally. By default, it is disabled.

Set the interval of sending loopback detection packets which is used to detect the loops in
the network.

interval-time: The interval of sending loopback detection packets. The valid values are from
1 to 1000 seconds. By default, the value is 30 seconds.
Step 4

loopback-detection recovery-time recovery-time

Set the auto-recovery time, after which the blocked port in Auto Recovery mode can
automatically be recovered to normal status.

recovery-time : Specify the detection interval, ranging from 2 to 100,000 seconds. The
default value is 90.
Step 5

Step 6

loopback-detection

Step 7

loopback-detection config process-mode { alert | port-based | vlan-based } recoverymode { auto | manual }

Enable loopback detection for the port. By default, it is disabled.

Set the process mode when a loopback is detected on the port. There are three modes:

alert: The switch will only display alerts when a loopback is detected. It is the default setting.

port-based: In addition to displaying alerts, the switch will block the port on which the loop
is detected.

vlan-based: In addition to displaying alerts, the switch will block the VLAN of the port in
which the loop is detected.
Set the recovery mode for the blocked port. There are two modes:

auto: After the recovery time expires, the blocked port will automatically recover to normal
status and restart to detect loops in the network.
manual: The blocked port can only be released manually. You can use the command
‘loopback-detection recover’ to recover the blocked port to normal status.
Step 9

show loopback-detection global

Verify the global configuration of Loopback Detection.

Step 10

show loopback-detection interface { fastEthernet port | gigabitEthernet port | tengigabitEthernet port | port-channel port-channel }
Verify the Loopback Detection configuration of the specified port.

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 loopback detection globally (keep the default
parameters):
Switch#configure
Switch(config)#loopback-detection
Switch(config)#show loopback-detection global
Loopback detection global status : enable
Loopback detection interval : 30s
Loopback detection recovery time : 3 intervals
Switch(config-if)#end
Switch#copy running-config startup-config
The following example shows how to enable loopback detection of port 1/0/3 and set the
process mode as alert and recovery mode as auto:
Switch#configure
Switch(config)#interface gigabitEthernet 1/0/3
Switch(config-if)#loopback-detection
Switch(config-if)#loopback-detection config process-mode alert recovery-mode auto
Switch(config-if)#show loopback-detection interface gigabitEthernet 1/0/3
Port

Enable

Process Mode

Recovery Mode

----

------

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

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

Gi1/0/3

enable

alert

auto

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

Loopback

Block

LAG

--------

-----

----

N/A

Configuration Examples

5.1

Example for Port Isolation

5.1.1 Network Requirements
As shown below, three hosts and a server are connected to the switch and all belong to
VLAN 10. Without changing the VLAN configuration, Host A is not allowed to communicate
with the other hosts except the server, even if the MAC address or IP address of Host A is
changed.
Figure 5-1

Network Topology
Switch
Gi1/0/1
Gi1/0/2

Host A

Gi1/0/4
Gi1/0/3

Host B
Host C
VLAN 10

Server

5.1.2 Configuration Scheme
You can configure port isolation to implement the requirement. Set port 1/0/4 as the only
forwarding port for port 1/0/1, thus forbidding Host A to forward packets to the other
hosts.
Since communications are bidirectional, if you want Host A and the server to communicate
normally, you also need to add port 1/0/1 as the forwarding port for port 1/0/4.
Demonstrated with T2600G-28TS, the following sections provide configuration procedure
in two ways: using the GUI and using the CLI.

5.1.3 Using the GUI
1) Choose the menu L2 FEATURES > Switching > Port > Port Isolation to load the
following page. It displays the port isolation list.

Figure 5-2

Port Isolation List

2) Click Edit on the above page to load the following page. Select port 1/0/1 as the port to
be isolated, and select port 1/0/4 as the forwarding port. Click Apply.
Figure 5-3

Port Isolation Configuration

3) Select port 1/0/4 as the port to be isolated, and select port 1/0/1 as the forwarding port.
Click Apply.

Figure 5-4

Port Isolation Configuration

4) Click

to save the settings.

5.1.4 Using the CLI

Switch#configure
Switch(config)#interface gigabitEthernet 1/0/1
Switch(config-if)#port isolation gi-forward-list 1/0/4
Switch(config-if)#exit
Switch(config)#interface gigabitEthernet 1/0/4
Switch(config-if)#port isolation gi-forward-list 1/0/1
Switch(config-if)#end
Switch#copy running-config startup-config

Verify the Configuration
Switch#show port isolation interface
Port

LAG

Forward-List

----

---

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

Gi1/0/1

N/A

Gi1/0/4

Gi1/0/2

N/A

Gi1/0/1-28,Po1-14

Gi1/0/3

N/A

Gi1/0/1-28,Po1-14

Gi1/0/4

N/A

Gi1/0/1

...

5.2

Example for Loopback Detection

5.2.1 Network Requirements
As shown below, Switch A is a convergence-layer switch connecting to several accesslayer switches. Loops can be easily caused in case of misoperation on the accesslayer switches. If there is a loop on an access-layer switch, broadcast storms will occur
on Switch A or even in the entire network, creating excessive traffic and degrading the
network performance.
To reduce the impacts of broadcast storms, users need to detect loops in the network via
Switch A and timely block the port on which a loop is detected.
Figure 5-5

Network Topology
Switch A
Gi1/0/1

Gi1/0/2

Gi1/0/3

Management Host

Access-layer Switches
Loop

5.2.2 Configuration Scheme
Enable loopback detection on ports 1/0/1-3 and configure SNMP to receive the trap
notifications. For detailed instructions about SNMP, refer to Configuring SNMP & RMON.
Here we introduce how to configure loopback detection and monitor the detection result
on the management interface of the switch.
Demonstrated with T2600G-28TS, the following sections provide configuration procedure
in two ways: using the GUI and using the CLI.

5.2.3 Using the GUI
1) Choose the menu L2 FEATURES > Switching > Port > Loopback Detection to load the
configuration page.
2) In the Loopback Detection section, enable loopback detection and web refresh
globally. Keep the other parameters as default values and click Apply.
Figure 5-6

Global Configuration

3) In the Port Config section, enable ports 1/0/1-3, select the operation mode as Port
-Based so that the port will be blocked when a loop is detected, and keep the recovery
mode as Auto so that the port will automatically be recovered to normal status after the
auto-recovery time. Click Apply.
Figure 5-7

Port Configuration

4) Monitor the detection result on the above page. The Loop status and Block status are
displayed on the right side of ports.

5.2.4 Using the CLI
1) Enable loopback detection globally and configure the detection interval and recovery
time.
Switch#configure
Switch(config)#loopback-detection
Switch(config)#loopback-detection interval 30
Switch(config)#loopback-detection recovery-time 3

2) Enable loopback detection on ports 1/0/1-3 and set the process mode and recovery
mode.
Switch(config)#interface range gigabitEthernet 1/0/1-3
Switch(config-if-range)#loopback-detection
Switch(config-if-range)#loopback-detection config process-mode port-based
recovery-mode auto
Switch(config-if-range)#end
Switch#copy running-config startup-config

Verify the Configuration
Verify the global configuration:
Switch#show loopback-detection global
Loopback detection global status : enable
Loopback detection interval: 30 s
Loopback detection recovery time : 90 s
Verify the loopback detection configuration on ports:
Switch#show loopback-detection interface
Port

Enable

Process Mode

Recovery Mode

Loopback

Block

LAG

----

--------

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

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

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

-----

Gi1/0/1 enable

port-based

auto

N/A

Gi1/0/2 enable

port-based

auto

N/A

Gi1/0/3 enable

port-based

auto

N/A

Appendix: Default Parameters
Default settings of ports are listed in th following tables.
Table 6-1

Default Parameters for Switching

Parameter

Default Setting

Port Config
Jumbo
Type
Status
Speed

Duplex
Flow Control

1518 bytes
Copper (For RJ45 Ports)
Fiber (For SFP Ports)
Enabled
Auto (For RJ45 Ports)
1000M (For SFP Ports)
Auto (For RJ45 Ports)
Full (For SFP Ports)
Disabled

Loopback Detection
Loopback Detection Status

Disabled

Detection Interval

30 seconds

Auto-recovery Time

90 seconds

Web Refresh Status

Disabled

Web Refresh Interval

6 seconds

Port Status

Disable

Operation mode

Alert

Recovery mode

Auto

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