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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-25303-03
Chapter 1 Configuring HSRP and VRRP
Configuring HSRP
Beginning in privileged EXEC mode, use one or more of these steps to configure HSRP authentication
and timers on an interface:
Use the no standby [group-number] authentication string interface configuration command to delete
an authentication string. Use the no standby [group-number] timers hellotime holdtime interface
configuration command to restore timers to their default values.
This example shows how to configure word as the authentication string required to allow Hot Standby
routers in group 1 to interoperate:
Switch# configure terminal
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# no switchport
Switch(config-if)# standby 1 authentication word
Switch(config-if)# end
This example shows how to set the timers on standby group 1 with the time between hello packets at 5
seconds and the time after which a router is considered down to be 15 seconds:
Switch# configure terminal
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# no switchport
Switch(config-if)# standby 1 ip
Switch(config-if)# standby 1 timers 5 15
Switch(config-if)# end
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter interface configuration mode, and enter the HSRP
interface on which you want to set authentication.
Step 3
standby [group-number] authentication string (Optional) authentication string—Enter a string to be carried in
all HSRP messages. The authentication string can be up to eight
characters in length; the default string is cisco.
(Optional) group-number—The group number to which the
command applies.
Step 4
standby [group-number] timers hellotime
holdtime
(Optional) Configure the time between hello packets and the
time before other routers declare the active router to be down.
• group-number—The group number to which the command
applies.
• hellotime—The hello interval in seconds. The range is from
1 to 255; the default is 3 seconds.
• holdtime—The time in seconds before the active or standby
router is declared to be down. The range is from 1 to 255;
the default is 10 seconds.
Step 5
end Return to privileged EXEC mode.
Step 6
show running-config Verify the configuration of the standby groups.
Step 7
copy running-config startup-config (Optional) Save your entries in the configuration file.
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