03-Layer 2—LAN Switching Configuration Guide

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17-Service loopback group configuration
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Configuring service loopback groups

About service loopback groups

A service loopback group contains one or multiple Ethernet ports for looping packets sent out by the device back to the device. This feature must work with other features, such as GRE. Member ports in a service loopback group are load balanced.

A service loopback group provides one of the following services:

·     Tunnel—Supports unicast tunnel services.

·     Multicast tunnel—Supports multicast tunnel services.

·     Multiport—Supports multiport ARP services.

·     VSI gateway—Supports VSI gateway services.

Restrictions and guidelines: Service loopback group configuration

When you add member ports to a service loopback group, follow these restrictions and guidelines:

·     Make sure the ports support the service type of the service loopback group.

·     Make sure the ports are not members of any other service loopback group.

When you apply service loopback groups to features, follow these restrictions and guidelines:

·     One service loopback group can be used by multiple features.

·     You cannot change the service type of a service loopback group.

·     Do not delete a service loopback group that is being used by a feature.

Configuring a service loopback group

1.     Enter system view.

system-view

2.     Create a service loopback group and specify its service type.

service-loopback group group-id type { { multicast-tunnel | tunnel } * | multiport | vsi-gateway }

You can configure only one service loopback group for a service type.

3.     Enter Layer 2 Ethernet interface view.

interface interface-type interface-number

4.     Assign the port to the service loopback group.

port service-loopback group group-id

By default, a port does not belong to a service loopback group.

 

CAUTION

CAUTION:

·     The configuration on a port is removed when it is assigned to a service loopback group. Make sure you fully understand the impact on your network when you assign a port to a service loopback group.

·     Do not assign a physical interface to the service loopback group if that interface is the only member interface of an IRF port. Doing so will split the IRF fabric, because the assignment operation removes the binding of the physical interface and IRF port.

·     For correct traffic processing, make sure a service loopback group has a minimum of one member port when it is being used by a feature.

 

You can assign a maximum of 32 ports to a service loopback group.

Display and maintenance commands for service loopback groups

Execute display commands in any view.

 

Task

Command

Display information about service loopback groups.

display service-loopback group [ group-id ]

 

Service loopback group configuration examples

Example: Configuring a service loopback group

Network configuration

All Ethernet ports on the device support unicast tunnel services. Assign Ten-GigabitEthernet 1/0/1 through Ten-GigabitEthernet 1/0/3 to a service loopback group to loop GRE packets sent out by the device back to the device.

Procedure

 

# Create service loopback group 1, and specify its service type as tunnel.

<Sysname> system-view

[Sysname] service-loopback group 1 type tunnel

# Assign Ten-GigabitEthernet 1/0/1 through Ten-GigabitEthernet 1/0/3 to service loopback group 1.

[Sysname] interface ten-gigabitethernet 1/0/1

[Sysname-Ten-GigabitEthernet1/0/1] port service-loopback group 1

All configurations on the interface will be lost. Continue?[Y/N]:y [Sysname-Ten-GigabitEthernet1/0/1] quit

[Sysname] interface ten-gigabitethernet 1/0/2

[Sysname-Ten-GigabitEthernet1/0/2] port service-loopback group 1

All configurations on the interface will be lost. Continue?[Y/N]:y [Sysname-Ten-GigabitEthernet1/0/2] quit

[Sysname] interface ten-gigabitethernet 1/0/3

[Sysname-Ten-GigabitEthernet1/0/3] port service-loopback group 1

All configurations on the interface will be lost. Continue?[Y/N]:y [Sysname-Ten-GigabitEthernet1/0/3] quit

# Create the interface Tunnel 1 and set it to GRE mode. The interface will automatically use service loopback group 1.

[Sysname] interface tunnel 1 mode gre

[Sysname-Tunnel1]

 

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