HSRP & sh standby

[lamsf]

We hv a cat5500 with 2 RSMs configured as HSRP.
We hv configured 2 VLANs as follows (brief):

RSM1:
=====
vlan10, ip add 10.0.0.1, standby 10.0.0.3
vlan20, ip add 20.0.0.1, standby 20.0.0.3

RSM2:
=====
vlan10, ip add 10.0.0.2, standby 10.0.0.3
vlan20, ip add 20.0.0.2, standby 20.0.0.3

The HSRP was working fine until we connected some new cables to vlan10 and vlan20, and we see the following output from show standby :

RSM1:
=====
vlan10, virtual ip is 10.0.0.3, active router is 20.0.0.1, standby router is local
vlan20, virtual ip is 20.0.0.3, active router is local, standby router is 10.0.0.1

RSM2:
=====
vlan10, virtual ip is 10.0.0.3, active router is 20.0.0.1, standby router is 10.0.0.1
vlan20, virtual ip is 20.0.0.3, active router is 20.0.0.1, standby router is 20.0.0.1

There seems to be some confusion in the active/standby routers between vlan10 and vlan20.

Anyone has any idea what could be causing this confusion in the router?

Thanks a lot.

 

[ADB100]

Are you bridging on the RSM as well as routing? The Standby state on RSM1 for VLAN 20 looks wrong, it says the standby router is 10.0.0.1, that isn't even on the same subnet. That is why I suspect bridging may be also turned on.
Can you post the relevent config bits?

Andy

 

[lamsf]

Hi ADB100,
Thx for the reply. Apparently, the new cables which caused the problem are 2 links to vlan10 and another 2 links to vlan20. One link from vlan10 and vlan20 each are connected to a switch while the other link from vlan10 and vlan20 are connected to another switch. The 2 switches are then interconnected (trunk) with STP.
I think there must be some sort of misconfiguration at the switches which caused the bridging to occur. We are still investigating this...