Cisco Catalyst 3750-E - Page 1123

42-11
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-08
Chapter 42 Configuring HSRP
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 st
andby [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 wor
d 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) gr
oup-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.