Virtual Router Redundancy Protocol
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OmniAccess 5740 Unified Services Gateway CLI Configuration Guide
Alcatel-Lucent
VRRP INTERFACE TRACKING
The VRRP interface tracking feature extends the capabilities of the VRRP to allow
tracking of specific interfaces that can alter the priority level of a virtual router in a
VRRP group.
For example, a WAN interface can be tracked. If the WAN interface goes down,
then the priority of the VRRP group is lowered, and another VRRP router with the
next highest priority becomes the master for that VRRP group.
ALCATEL-LUCENT'S INTERFACE TRACKING DESIGN
For each VRRP group that is configured, you can specify an interface that needs
to be tracked by the VRRP module for that group. The VRRP module in the router
will actively monitor the status of the specified interface. Any change in the status
of the interface will affect the priority of the router. When track interface is enabled
for a VRRP group, the behavior of the router is as follows:
W
HEN THE TRACK INTERFACE GOES DOWN
The following section details the process followed by a router when it is either in
master state or backup state, when the track interface goes down.
R
OUTER IN MASTER STATE
The following actions are taken when the track interface goes down:
• The router will decrement the priority of the VRRP group from the configured
VRRP priority when the tracked interface goes down. If the priority of a VRRP
group is 100, and the decrement value is set to 60, when the tracked interface
goes down, the VRRP priority is set to 40.
• Any router with the next highest priority will take over as the master, and the state
of the current master router changes to a backup state.
• In the absence of another active router with the next highest priority, the current
router will become the master again to provide some limited set of services.
R
OUTER IN BACKUP STATE
The router will not take any action when the track interface goes down. When
router is in backup state, router will have priority based on the decrement value
configured.
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