Hello, let's say switch 1 and switch 2 connect to the router using fa0/1 for both respectively. They are your uplinks and we can track these in hsrp so if the link to the router fails, the other standby member will become active.
You also need to ensure that spanning-tree is in a correct topology before you configure HSRP. I'm assuming there is a trunk between the switches.
I want to create a gateway for clients using the 100.0.0.1 HSRP group
Switch 1
Interface vlan 100
IP address 100.0.0.2 255.255.255.0
Standby 100 ip 100.0.0.1
Standby 100 preempt
Standby 100 priority 105
Standby 100 track fa0/1 10
Switch 2
Interface vlan 100
IP address 100.0.0.3 255.255.255.0
Standby 100 ip 100.0.0.1
Standby 100 preempt
Standby 100 track fa0/1
This configuration explained:
On switch 1 you have hsrp with a priority of 105 which is better than switch 2 (default priority of 100). On switch 1, If the link to the router went down - we have the track command which says, if the fa0/1 interface goes down, take away 10 from the priority. This becomes 95.
Switch 2 will say, I have a better priority than you, (preempt enabled) I will become active, I have 100 whereas you have 95.
If the link was to return on switch 1 then it would preempt and say, 'hey, I have a better priority now, I'll take back the active role'
Hope this helps
More info here: http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094e8c.shtml
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