Alcatel-Lucent 7750 SR Manual page 1340

Os services guide

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VPRN Service Configuration Commands

[no] policy vrrp-policy-id

config>service>vprn>sub-if>grp-if>srrp

This command associates one or more VRRP policies with the SRRP instance. A VRRP policy is a

collection of connectivity and verification tests used to manipulate the in-use priorities of VRRP and

SRRP instances. A VRRP policy can test the link state of ports, ping IP hosts, discover the existence

of routes in the routing table or the ability to reach L2 hosts. When one or more of these tests fail, the

VRRP policy has the option of decrementing or setting an explicit value for the in-use priority of an

SRRP instance.

More than one VRRP policy may be associated with an SRRP instance. When more than one VRRP

policy is associated with an SRRP instance the delta decrement of the in-use priority is cumulative

unless one or more test fail that have explicit priority values. When one or more explicit tests fail, the

lowest priority value event takes effect for the SRRP instance. When the highest delta-in-use-limit is

used to manage the lowest delta derived in-use priority for the SRRP instance.

VRRP policy associations may be added and removed at anytime. A maximum of two VRRP policies

can be associated with a single SRRP instance.

The no form of the command removes the association with vrrp-policy-id from the SRRP instance.

vrrp-policy-id — Specifies one or more VRRP policies with the SRRP instance.

priority priority

config>service>vprn>sub-if>grp-if>srrp

This command overrides the default base priority for the SRRP instance. The SRRP instance priority

is advertised by the SRRP instance to its neighbor router and is compared to the priority received

from the neighbor router. The router with the best (highest) priority enters the master state while the

other router enters the backup state. If the priority of each router is the same, the router with the

lowest source IP address in the SRRP advertisement message assumes the master state.

The base priority of an SRRP instance can be managed by VRRP policies. A VRRP policy defines a

set of connectivity or verification tests which, when they fail, may lower an SRRP instances base

priority (creating an in-use priority for the instance). Every time an SRRP instances in-use priority

changes when in master state, it sends an SRRP advertisement message with the new priority. If the

dynamic priority drops to zero or receives an SRRP Advertisement message with a better priority, the

SRRP instance transitions to the becoming backup state.

When the priority command is not specified, or the no priority command is executed, the system uses

a default base priority of 100. The priority command may be executed at anytime.

The no form of the command restores the default base priority to the SRRP instance. If a VRRP

policy is associated with the SRRP instance, it will use the default base priority as the basis for any

modifications to the SRRP instances in-use priority.

7750 SR OS Services Guide