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C
ONFIGURING
THE
S
WITCH
3-254
Configuring Router Redundancy
Router redundancy protocols use a virtual IP address to support a primary
router and multiple backup routers. The backup routers can be configured
to take over the workload if the master router fails, or can also be
configured to share the traffic load. The primary goal of router redundancy
is to allow a host device which has been configured with a fixed gateway to
maintain network connectivity in case the primary gateway goes down.
This switch supports the Virtual Router Redundancy Protocol (VRRP).
This protocol requires you to specify the interface of one of the routers
participating in the virtual group as the address for the master virtual
router. VRRP then selects the backup routers based on the specified
virtual router priority. Router redundancy can be set up in any of the
following configurations.
• A master virtual router with one or more backup routers.
Master Router
Backup Router
Virtual Router (VR23)
VRIP = 192.168.1.3
VRID 23
IP(R1) = 192.168.1.3
IP(VR23) = 192.168.1.3
VR Priority = 255
VRID 23
IP(R2) = 192.168.1.5
VRIP(VR23) = 192.168.1.3
VR Priority = 100