H3C Technologies H3C S5560 Series Switches - Manual (Page 291)

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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:
• 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:
Step Command Remarks
1. Enter system view. system-view N/A
2. Create a service loopback
group and specify its service
type.
service-loopback group number
type { {multicast-tunnel | tunnel }
*| multiport }
N/A
3. Enter Layer 2 Ethernet
interface view.
interface interface-type
interface-number
N/A
4. Assign a port to the service
loopback group. port service-loopback group
number
By default, a service loopback
group does not contain ports.
You can assign a maximum of 8
ports to a service loopback group.