VRRP
Router Configuration Guide 381
VRRP Priority Control Policies
This implementation of VRRP supports control policies to manipulate virtual router
participation in the VRRP master election process and master self-deprecation. The local
priority value for the virtual router instance is used to control the election process and master
state.
VRRP Virtual Router Policy Constraints
Priority control policies can only be applied to non-owner VRRP virtual router instances.
Owner VRRP virtual routers cannot be controlled by a priority control policy because they
are required to have a priority value of 255 that cannot be diminished. Only one VRRP
priority control policy can be applied to a non-owner virtual router instance.
Multiple VRRP virtual router instances may be associated with the same IP interface,
allowing multiple priority control policies to be associated with the IP interface.
An applied VRRP priority control policy only affects the in-use priority on the virtual router
instance when the preempt mode has been enabled. A virtual router instance with preempt
mode disabled will always use the base priority as the in-use priority, ignoring any configured
priority control policy.
VRRP Virtual Router Instance Base Priority
Non-owner virtual router instances must have a base priority value between 1 and 254. The
value 0 is reserved for master termination. The value 255 is reserved for owners. The default
base priority for non-owner virtual router instances is the value 100.
The base priority is the starting priority for the VRRP instance. The actual in-use priority for
the VRRP instance is derived from the base priority and an optional VRRP priority control
policy.
VRRP Priority Control Policy Delta In-Use Priority Limit
A VRRP priority control policy enforces an overall minimum value that the policy can inflict
on the VRRP virtual router instance base priority. This value provides a lower limit to the
delta priority events manipulation of the base priority.
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