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Router Redundancy Commands
4-311
4
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 4-107 Router Redundancy Commands
Command Groups Function Page
Virtual Router Redundancy
Protocol
Configures interface settings for VRRP 4-311
Hot Standby Router
Protocol
Configures interface settings for HSRP 4-320
Table 4-108 VRRP Commands
Command Function Mode Page
vrrp ip Enables VRRP and sets the IP address of the virtual router IC 4-312
vrrp authentication key Configures a key used to authenticate VRRP packets
received from other routers
IC 4-313
vrrp priority Sets the priority of this router in the VRRP group IC 4-313
vrrp timers advertise Sets the interval between successive advertisements by
the master virtual router
IC 4-314
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 4-315
show vrrp Displays VRRP status information PE 4-316
show vrrp interface Displays VRRP status information for the specified interface PE 4-318
show vrrp router counters Displays VRRP statistics PE 4-318
show vrrp interface counters Displays VRRP statistics for the specified interface PE 4-319
clear vrrp router counters Clears VRRP router statistics PE 4-319
clear vrrp interface counters Clears VRRP interface statistics PE 4-319