Virtual Router Redundancy Protocol (VRRP)
Configuring VRRP
Preempt Mode on VRRP Backup Routers
This command applies to VRRP Backup routers only, and is used to minimize
network disruption due to unnecessary preemption of the Master operation
among Backup routers.
Syntax: [no] preempt-mode
Disables or re-enables Preempt mode. In the default mode, a
Backup router coming up with a higher priority than another
Backup that is currently operating as Master will take over the
Master function. Using the no form of the command disables
this operation, thus preventing the higher-priority Backup
from taking over the Master operation from a lower-priority
Backup. This command does not prevent an Owner router
from resuming the Master function after recovering from
being unavailable. Also, the VR instance must be disabled (the
default VR state) when using this command. For more on
Preempt mode, refer to “Preempt Mode” on page 6-10.
(Default: Enabled)
Enabling or Disabling VRRP Operation on a VR
After configuring a new VR or changing the configuration on an existing VR,
you must use this command to enable the VR to operate.
Syntax: [no] enable
Enabling or disabling a VR enables or disables dynamic VRRP
operation on that VR. Also, it is necessary to disable a VR
before changing its configuration. Note that VRRP must be
enabled (using the router vrrp command) in the global config-
uration context before enabling a VR. (Disabling a VR can be
done regardless of the current, global VRRP configuration.)
(Default: Disabled)
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