40-1
Chapter 40: 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 each router in the group that will
participate in the protocol as the master router or a backup router. To select a
specific device as the master router, set the address of this interface as the virtual
router address for the 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 if it has a higher priority than the currently active master router.
Table 40-1 Router Redundancy Commands
Command Groups Function Page
Virtual Router Redundancy
Protocol
Configures interface settings for VRRP 40-1
Table 40-2 VRRP Commands
Command Function Mode Page
vrrp ip Enables VRRP and sets the IP address of the virtual router IC 40-2
vrrp authentication Configures a key used to authenticate VRRP packets
received from other routers
IC 40-3
vrrp priority Sets the priority of this router in the VRRP group IC 40-3
vrrp timers advertise Sets the interval between successive advertisements by
the master virtual router
IC 40-4
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 40-5
show vrrp Displays VRRP status information PE 40-6
show vrrp interface Displays VRRP status information for the specified interface PE 40-8
show vrrp router counters Displays VRRP statistics PE 40-9
show vrrp interface counters Displays VRRP statistics for the specified interface PE 40-9
clear vrrp router counters Clears VRRP router statistics PE 40-10
clear vrrp interface counters Clears VRRP interface statistics PE 40-10
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