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hvd
New Member

ISC link dropping down

I'm coping with following problem.

We have about 8 css running in couples of 2 with one active and a second as standby using an ISC.

Active and backup css are separated in 2 computerrooms, css1 is connected to a backbone switch in room 1 which is connected to another backbone switch in room 2 providing te connection to the backup css. By other means no direct conenction between the 2 css is possible without passing the networkinfrastructure.

Each pair of css is using its own dedicated vlan.

All machines tend to have the same problem that the ISC link is dropping down frequently.

The messages reported are :

SYSSOFT-4: ISC link is DOWN

SYSSOFT-4: Enterprise:ISC State Change:DOWN, port-1 fail = None, port-2 fail = No Interface Assigned

SYSSOFT-4: Enterprise:Inter-Switch Communications Lifetick Failure:1/11

SYSSOFT-4: Enterprise:ISC State Change:DOWN, port-1 fail = No Discovery Response, port-2 fail = No Interface Assigned

SYSSOFT-4: Enterprise:ISC State Change:DOWN, port-1 fail = None, port-2 fail = No Interface Assigned

SYSSOFT-4: Enterprise:ISC State Change:UP, port-1 fail = None, port-2 fail = No Interface Assigned

Any ideas or suggestions what the problem may be over here besides not using direct connections.

Regards

HVD.

1 REPLY
Cisco Employee

Re: ISC link dropping down

sniff the traffic at the different catalyst.

Are you trunking this vlan with others ?

you might one to use a dedicated vlan between your catalysts.

Gilles.

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