3945 ISR HSRP failover problem

[Douglas Bradfield]

setup simple HSRP failover scenario on two 3945 routers. I am tracking the serial interface. all is properly setup. I'll do a show standby brief and routers are active and standby. when i do a shut on the serial of router 1 it will not failover to router 2. I see the priority go down to 90 but it never goes to standby. no ACL's on the interfaces. I have done these a hundred times without issue.

[Reza Sharifi]

can you post configs from both 3945?

[Latchum Naidu]

Hi Douglas,

Your configuration on both active and standby as to be like below as per best practice.
This is what I have in my current setup at one of my site and working well without any issues.

ACTIVE:

track 1 interface GigabitEthernet0/0 line-protocol
!
track 2 interface GigabitEthernet0/0 line-protocol

interface GigabitEthernet0/1
ip address 10.10.10.12 255.255.255.0
ip helper-address 10.10.2.11
ip nbar protocol-discovery
ip nat inside
ip virtual-reassembly
duplex full
speed 100
standby use-bia scope interface
standby 0 ip 10.10.10.10
standby 0 priority 110
standby 0 preempt
standby 0 authentication peter2mo
standby 0 track 1 decrement 30
standby 0 track 2 decrement 30

STANDBY:

track 1 interface GigabitEthernet0/0 line-protocol

interface GigabitEthernet0/1
ip address 10.10.10.11 255.255.255.0
ip helper-address 10.10.2.11
ip flow ingress
ip nat inside
ip virtual-reassembly
duplex full
speed 100
standby use-bia scope interface
standby 0 ip 10.10.10.10
standby 0 priority 90
standby 0 authentication peter2mo
standby 0 track 1 decrement 30

Please rate the helpful posts.
Regards,
Naidu.

[cadet alain]

Hi,

Have you configured preemption on the standby? Otherwise even if the priority gets lower than Active it will never take the Active role.

Regards.

Alain.

[Douglas Bradfield]

I have not used that in the past on other routers or switches, only on the active router. but there may be something unique on the 3945's because it worked fine. Thank you