CCIE Practical Studies, Volume I

The "Big show" and "Big D" for HSRP

Still building on the first example, this section demonstrates the use of the show and debug commands for HSRP:

show standby { brief interface } debug standby

The show standby command shows whether this interface is in standby mode or active mode. Active mode indicates that interface or router is the primary, while standby indicates that it's the secondary or backup interface or router. The show standby command also shows the hello timers, virtual MAC address in use, and any tracking information. Example 16-5 lists the output from the show standby command on the caladan router.

Example 16-5 show standby Command Output

caladan# show standby Ethernet0 - Group 1 Local state is Active, priority 105, may preempt Hellotime 3 holdtime 10 Next hello sent in 00:00:02.496 Hot standby IP address is 172.16.1.1 configured Active router is local Standby router is 172.16.1.3 expired Standby virtual mac address is 0000.0c07.ac01 Tracking interface states for 1 interface, 1 up: Up Serial0 caladan#

The debug standby command shows hello timer and hold timer settings. In addition, this command displays standby group information, such as which router is active and what the priorities are for the active and standby routers. Example 16-6 lists the output from the debug standby command, as seen on giedi prime.

Example 16-6 E debug standby Command Output for giedi prime

giedi_prime#debug standby SB1:Ethernet0 Hello in 172.16.1.2 Active pri 105 hel 3 hol 10 ip 172.16.1.1 SB1:Ethernet0 Hello out 172.16.1.3 Standby pri 95 hel 3 hol 10 ip 172.16.1.1 SB1:Ethernet0 Hello in 172.16.1.2 Active pri 105 hel 3 hol 10 ip 172.16.1.1 SB1:Ethernet0 Hello out 172.16.1.3 Standby pri 95 hel 3 hol 10 ip 172.16.1.1 SB1:Ethernet0 Hello in 172.16.1.2 Active pri 105 hel 3 hol 10 ip 172.16.1.1 SB1:Ethernet0 Hello out 172.16.1.3 Standby pri 95 hel 3 hol 10 ip 172.16.1.1