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New Member

3750 StackWise not working...need your help.

Been deploying 3750s for awhile and this is the first time I've ran into this issue. We have 8 3750s stacked, with a 3-meter cable from switch 8 to switch 1 for redundancy. The link between switch-5 and switch-6 is down. Cheched and replaced stack cable, still down. What else can I do?

4 REPLIES
Hall of Fame Super Bronze

Re: 3750 StackWise not working...need your help.

Stacking is hardware dependent, nothing to do in the switch software config.

Try connecting switch's 5 port to another switch, if you get a connection, try the same from switch's 6 port and try to determine which port is bad.

Once you do, request a switch replacement from Cisco.

Silver

Re: 3750 StackWise not working...need your help.

What I remember, but can't find a description of it on Cisco Web, is that once you connect stackwise in physical a loop, one of the links goes into down state.

Stackwise is loop by itself, that's my logical reasoning for this behavior. The down link becomes redundant link in case of failure.

As I said - i couldn't find the description of that in Cisco documents.

You can check it out if you have 2x 3750 in lab environment and interconnect them with stack. In fact, I'm going to go to the storage room and get me a couple of c3750 to check this.

Silver

Re: 3750 StackWise not working...need your help.

Just confirmed it - if I connect two sitches in a stackwise physical loop, one port goes down.

This seems to be natural functioning.

New Member

Re: 3750 StackWise not working...need your help.

I lab two new 3750s, and got "OK" on all ports.

I don't think it's anything like spanning-tree. Looks to be more physical, a bad stack port on either switch-5 or switch-6. Going to try replacing switch 5, then switch-6 if necessary.

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