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Chapter 36 VRRP
If switch A (the master router) is unavailable, switch B takes over. Traffic is then processed by
switch B.
36.1.1 VRRP Parameters
This section describes some VRRP parameters.
36.1.1.1 Advertisement Interval
The master router sends out Hello messages to let the other backup routers know that it is still
up and running. The time interval between sending the Hello messages is the advertisement
interval. By default, a Hello message is sent out every second.
If the backup routers do not receive a Hello message from the master router after this interval
expires, it is assumed that the master router is down. Then the backup router with the highest
priority becomes the master router.
All routers participating in the virtual router must use the same advertisement
interval.
36.1.1.2 Priority
Configure the priority level (1 to 254) to set which backup router to take over in case the
master router goes down. The backup router with the highest priority will take over. The
priority of the VRRP router that owns the IP address(es) associated with the virtual router is
255.
36.1.1.3 Preempt Mode
If the master router is unavailable, a backup router assumes the role of the master router.
However, when another backup router with a higher priority joins the network, it will preempt
the lower priority backup router that is the master. Disable preempt mode to prevent this from
happening.
By default, a layer 3 device with the same IP address as the virtual router will become the
master router regardless of the preempt mode.
36.2 VRRP Status
Use this screen to look at the virtual routers in which the switch is participating. To open this
screen, click IP Application > VRRP.
Figure 100 VRRP Status
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MS-7206 User's Guide
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