Hot standby router protocol (HSRP) is a Cisco propriety protocol which
provides redundancy of the default gateway by the use of two routers. The
routers have both a own physical IP address. The router whith the highest HSRP
priority will become active (if may preempt) and will listen to the standby IP
address.
See example below:
Active router configuration
interface FastEthernet0/0
description *** primary router ***
ip address 10.10.10.2 255.255.255.0
standby 2 ip 10.10.10.1
standby 2 priority 110
standby 2 preempt
Standby router configuration
interface FastEthernet0/0
description *** standby router ***
ip address 10.10.10.3 255.255.255.0
standby 2 ip 10.10.10.1
standby 2 priority 100
the status of HSRP can be checked with the folowing command:
show standby (brief)
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