Contents

Configuring service instance groups· 1

About service instance groups· 1

Restrictions and guidelines: Service instance group configuration· 1

Configuring a service instance group· 1

Display and maintenance commands for service instance groups· 2

Configuring service instance groups

About service instance groups

Associated with a failover group, a service instance group helps back up service data for specific service modules (such as NAT), and guarantee correct operation of specific services.

For inter-system service backup, you can associate a service instance group with only one failover group. The nodes in the failover group must belong to different systems.

For intra-system service backup, you can associate a service instance group with one or multiple failover groups. The nodes in the failover groups must belong to the same system.

·     If you associate a service instance group with one failover group, the nodes in the failover group perform NAT service backup globally.

·     If you associate a service instance group with multiple failover groups, NAT service backup loads are distributed among the failover groups. Each failover group also backs up services between its nodes. You can associate a service instance group with a maximum of four failover groups.

For more information about failover groups, see "Configuring failover groups."

Restrictions and guidelines: Service instance group configuration

You cannot use a service instance group for both inter-system and intra-system service backup.

You cannot associate a service instance group with multiple failover groups if the service instance group has been associated with a NAT instance that has one of the following settings:

·     Static port block mappings.

·     Address ranges configured by using the address command for a NAT address group that provides the outbound dynamic NAT service.

·     NO-PAT.

·     Static NAT.

·     Global NAT address group that has multiple NAT instance associations.

·     NAT server mapping that maps one public IP address to multiple private IP addresses.

If the NAT instance with a service instance group specified has NAT entries, you are not allowed to perform the following operations:

·     Delete the service instance group.

·     Cancel the association between the service instance group and failover group.

Configuring a service instance group

1.     Enter system view.

system-view

2.     Create a service instance group and enter its view.

service-instance-group service-instance-group-name

3.     Associate a failover group with the service instance group.

failover-group failover-group-name

By default, a service instance group is not associated with any failover groups.

Display and maintenance commands for service instance groups

Execute display commands in any view.