IP Configuration: IPv4 VRRP Virtual Routers
Overview
Cisco 500 Series Stackable Managed Switch Administration Guide Release 1.3 356
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Router B and C function as a virtual router backups. If the virtual router master
fails, the router configured with the higher priority becomes the virtual router
master and provides service to the LAN hosts with minimal interruption.
NOTE The VRRP router priority depends on the following: If the VRRP router
is the owner, its priority is 255 (the highest), if it is not an owner, the priority is
manually configured (always less than 255).
When Router A recovers, it becomes the virtual router master again. During the
period that the master is recovering, both masters forwards packets and as a
result, there is some duplication (regular behavior) but no interruption.
For more detail on the roles that VRRP routers play and what happens if the virtual
router master fails, see VRRP Router Priority and Preemption.
The following shows a LAN topology in which VRRP is configured. Routers A and B
share the traffic to and from clients 1 through 4 and Routers A and B act as virtual
router backups to each other if either router fails.
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