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OUTER
R
EDUNDANCY
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OMMANDS
4-381
Router Redundancy Commands
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.
Virtual Router Redundancy Protocol Commands
To configure VRRP, select an interface on one router in the group to serve as
the master virtual router. This physical interface is used as the virtual address
for the router group. Now set the same virtual address and a priority on the
backup routers, and configure an authentication string. You can also enable
the preempt feature which allows a router to take over as the master router
when it comes on line.
Table 4-101 Router Redundancy Commands
Command Groups Function Page
Virtual Router
Redundancy Protocol
Configures interface settings for VRRP 4-381
Table 4-102 VRRP Commands
Command Function Mode Page
vrrp ip Enables VRRP and sets the IP address of the
virtual router
IC 4-382
vrrp
authentication key
Configures a key used to authenticate VRRP
packets received from other routers
IC 4-383
vrrp priority Sets the priority of this router in the VRRP group IC 4-384
vrrp timers
advertise
Sets the interval between successive
advertisements by the master virtual router
IC 4-385
vrrp preempt Configures the router to take over as master
virtual router for a VRRP group if it has a higher
priority than the current master virtual router
IC 4-386
show vrrp Displays VRRP status information PE 4-387