HSRP adjaceny issue

[ajay kondapalli]

Hi,

I have one issue with HSRP adjacency. We have two routers HSRP enabled for a group of  VLANs.

We are facing adjacency issue with three vlans frequently.

HSRP state is being changed from Active to Speak , and later Speak to Actvie. .......frequently on both routers.

What is the reason , how can we fix that. ?

Thanks,

Ajay.

[Giuseppe Larosa]

Hello Ajay,

HSRP states rapidly changing is a symptom of problems at layer 2 like bridging loops

you need to look for changes of STP state on the switches that implement the group of Vlans associated to those HSRP groups.

show spanning-tree

look for changes of STP root bridge Bridge ID and so on

Hope to help

Giuseppe

[manju.cisco]

Hi Ajay,

are you facing same issue with all vlans or just 3 vlans?

[ajay kondapalli]

We are facing the issue with only 3 vlans.

[Craig_Baum_2]

As others have said. Chances are the hellos are getting delayed/lost. Do you have preempt configured?

How big is your l2 network? I've seen problems with root bridges not on the core switches and thus the inter-switch head end was blocked causing the hello updates to traverse 6 switches!

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