IP Configuration: VRRP
VRRP Topology
347 Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
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VRRP Topology
The following shows a LAN topology in which VRRP is configured. In this example, Routers
A, B and C are VRRP and comprise a virtual router. The IP address of the virtual router is the
same as that configured for the Ethernet interface of Router A (198.168.2.1).
Basic VRRP Topology
Because the virtual router uses the IP address of the physical Ethernet interface of Router A,
Router A assumes the role of the virtual router master and is also known as the IP address
owner. As the virtual router master, Router A controls the IP address of the virtual router and is
responsible to route packets on behalf of the virtual router. Clients 1 through 3 are configured
with the default gateway IP address of 198.168.2.1. Client 4 is configured with the default
gateway IP address of 198.168.2.2.
NOTE The VRRP router that is the IP address owner responds/processes packets whose destination is
to the IP address. The VRRP router that is the virtual router master, but not the IP address
owner, does not respond/process those packets.
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).
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