Cisco Systems 78-13983-04 manual Configuring Hsrp Support

Chapter 4 Configuring with the Command-Line Interface

Configuring Fast Ethernet Interfaces

Configuring HSRP Support

In redundant configurations, the MWR 1900 uses HSRP to control the active and standby routers. To use HSRP, you must configure the standby priority attributes and the IP address of the virtual router. Priority is determined first by the configured priority value, and then by the IP address. In each case a higher value is of greater priority.

Note If you do not plan to use the MWR 1900 in a redundant configuration, do not configure HSRP support and see Configuring Redundancy, page 4-16for information about using the router in a stand-alone environment.

To configure HSRP support, do the following while still in interface configuration mode:

Step 1 Specify the name of the standby group.

Router(config-if)# standby group name group-name

Note The standby group names must be “one” and “two.” For FE 0/0, the command must be

standby 1 name one. For FE 0/1, the command must be standby 2 name two.

Tips If you omit the group-nameor if you enter a group name that doesn’t begin with one or two, the configuration will fail and there will be a mismatch in the information displayed by the show redundancy and show standby commands.

Step 2 Enable HSRP and assign an IP address to the virtual router. This address is the same for both the active and standby routers.

Router(config-if)# standby group ip address

Step 3 Configure the time between hello packets and the time before other routers declare the active Hot Standby or standby router to be down.

Router(config-if)# standby group timers [msec] hellotime [msec] holdtime

Note You must use 1 for the hello time and 3 for the hold time.

Step 4 Indicate that the router can become the active router when its priority is higher than all other HSRP-configured routers. Without preemption, a standby router will only transition to the active state if HSRP “hello messages” cease. In the CDMA IP-RAN solution, there may be situations in which you want a switchover to occur in the absence of a router or FE failure, therefore, preemption is required.

Router(config-if)# standby group preempt

Cisco MWR 1900 Mobile Wireless Edge Router Software Configuration Guide

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