Contents

Configuring service loopback groups· 1

Configuration procedure· 1

Displaying and maintaining service loopback groups· 2

Service loopback group configuration example· 2

Network requirements· 2

Configuration procedure· 2

Configuring 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.

A service loopback group provides one of the following services:

·     Tunnel—Supports unicast tunnel traffic.

·     Multicast tunnel—Supports multicast tunnel traffic.

·     Multiport—Supports multiport ARP traffic.

The device supports only one service loopback group for each service type. You can use a service loopback group with multiple features.

Member ports in a service loopback group are load balanced.

Configuration procedure

Follow these guidelines when you configure a service loopback group:

·     Ports bound to IRF ports cannot be assigned to service loopback groups.

·     Make sure the ports you are assigning to a service loopback group meet the following requirements:

?     The ports are not used for any other purposes. The configuration on a port is removed when it is assigned to a service loopback group.

?     The ports support the service type of the service loopback group and are not members of any other service loopback group.

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

·     For correct traffic processing, follow these guidelines:

?     Make sure the service loopback group has a minimum of one member port when it is being used by a feature.

?     Do not delete the service loopback group when it is being used by a feature.

To configure a service loopback group:

Displaying and maintaining service loopback groups

Execute display commands in any view.

Service loopback group configuration example

Network requirements

All Ethernet ports on Device A support the tunnel service.

Assign GigabitEthernet 1/0/1 through GigabitEthernet 1/0/3 to a service loopback group to loop GRE packets sent out by the device back to the device.

Configuration procedure

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

<DeviceA> system-view

[DeviceA] service-loopback group 1 type tunnel

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

[DeviceA] interface gigabitethernet 1/0/1

[DeviceA-GigabitEthernet1/0/1] port service-loopback group 1

[DeviceA-GigabitEthernet1/0/1] quit

[DeviceA] interface gigabitethernet 1/0/2

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

[DeviceA-GigabitEthernet1/0/2] quit

[DeviceA] interface gigabitethernet 1/0/3

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

[DeviceA-GigabitEthernet1/0/3] quit

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

[DeviceA] interface tunnel 1 mode gre

[DeviceA-Tunnel1]