Alcatel-Lucent 7750 SR OS Service Manual page 861

For proper operation, each subscriber subnet associated with the SRRP instance must have a gw-
address defined. The SRRP instance cannot be activated (no shutdown) unless each subscriber
subnet associated with the group IP interface has an SRRP gateway IP address. Once the SRRP
instance is activated, new subscriber subnets cannot be added without a corresponding SRRP
gateway IP address. Table 2.2 describers how the SRRP instance state is used to manage access to
subscriber hosts associated with the group IP interface.
SRRP instances are created in the disabled state (shutdown). To activate SRRP the no shutdown
command in the SRRP context must be executed.
Before activating an SRRP instance on a group IP interface, the following actions are required:
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Before activating an SRRP instance on a group IP interface, the following actions should be
considered:
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7750 SR OS Services Guide
Add SRRP gateway IP addresses to all subscriber subnets associated with the group IP
interface, including subnets on subscriber IP interfaces associated as retail routing
contexts (at least one subnet must be on the subscriber IP interface containing the group IP
interface and its SRRP instance)
Create a redundant IP interface and associate it with the SRRP instances group IP
interface for shunting traffic to the remote router when master
Specify the group IP interface SAP used for SRRP advertisement and Information
messaging
Associate the SRRP instance to a Multi-Chassis Synchronization (MCS) peering
terminating on the neighboring router (the MCS peering should exist as the peering is
required for redundant subscriber host management)
Define a description string for the SRRP instance
Specify the SRRP gateway MAC address used by the SRRP instance (must be the same
on both the local and remote SRRP instance participating in the same SRRP context)
Change the base priority for the SRRP instance
Specify one or more VRRP policies to dynamically manage the SRRP instance base
priority
Specify a new keep alive interval for the SRRP instance
Virtual Private Routed Network Services
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