Contents

Configuring service loopback groups· 1

About service loopback groups· 1

Restrictions: Hardware compatibility with service loopback groups· 1

Restrictions and guidelines: Service loopback group configuration· 1

Configuring a service loopback group· 1

Display and maintenance commands for service loopback groups· 2

Service loopback group configuration examples· 2

Example: Configuring a service loopback group· 2

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 only the tunnel service, which supports unicast tunnel traffic.

Restrictions: Hardware compatibility with service loopback groups

Service loopback groups are supported only on SPC, CSPC (except CSPC-GE16XP4L-E, CSPC-GE24L-E, and CSPC-GP24GE8XP2L-E), and CMPE-1104 cards.

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 and are not members of any other service loopback group.

·          The configuration on a port is removed when it is assigned to the service loopback group.

·          To avoid IRF split, do not assign a physical interface to the service loopback group if that interface is the only member interface of an IRF port.

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

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 tunnel

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.

You can assign multiple ports to a service loopback group.

Display and maintenance commands for service loopback groups

Execute display commands in any view.

Service loopback group configuration examples

Example: Configuring a service loopback group

Network configuration

All Ethernet ports on the device 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.

Procedure

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

<Sysname> system-view

[Sysname] service-loopback group 1 type tunnel

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

[Sysname] interface gigabitethernet 1/0/1

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

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

[Sysname] interface gigabitethernet 1/0/2

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

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

[Sysname] interface gigabitethernet 1/0/3

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

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