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Interface numbering in a Cisco 3750 stack

Posted on 2009-07-10
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Last Modified: 2012-05-07
Hi,

I am implementing a new Cisco stack on Monday and I installed the stack onto the network today. I powered up the top switch and 2 mins later powered up the bottom one. I presently have the console into a nearby workstation for remote access.

My problem is this:...the top switch has numbered the interfaces 2/0/1, 2/0/2, etc....instead of 1/0/1, 1/0/2 etc. As this is the top switch I want the numbering to reflect this for future clarity. So what I did was take the power and stack cable out of the bottom switch, did a write erase to remove the startup config, and then reloaded the top switch. But the interface numbering system has stayed the same on the top switch....2/0/1, 2/0/2, etc.

Any ideas why I cannot do this numbering? Or if I can change it?

Thanks a lot

Ally
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Question by:ally0000
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LVL 33

Expert Comment

by:MikeKane
ID: 24824339
You'll need to renumber the switch or remove it from the stack completely using:

no switch <stack number> provision <switch model>

Example:

To remove switch number 2 from a stack. The model number of the switch is WS-C3750G-48T:

3750(config)# no switch 2 provision ws-c3750g-48t
3750(config)# exit
3750# write memory
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Author Comment

by:ally0000
ID: 24824386
Hi,

thanks for the reply. Its a little late in the UK now to take it down again so can I do this to a running stack and will that will be enough to rename the 2/0/x ports to 1/0/x without removing cables etc?

I am able to reboot the stack OK.

Thanks
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LVL 33

Expert Comment

by:MikeKane
ID: 24824531
hmmm,   I don't know if you can do that....   Even if you did, I would assume the stack would renegotiate itself, no?   I'd be very curious to see what happens.   I wouldn't do this to a production stack though.
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Author Comment

by:ally0000
ID: 24824618
Hi,

Just tried this and it worked beautifully.

=========================================
How do you manually change the member number?

   1.      Go to global configuration mode.
   2.      Issue the command switch <current-stack-member-number> renumber <new-stack-member-number> .
   3.      Return to the privileged EXEC mode and reload the member with the command reload slot current-stack-member-number .
   4.      After the member boots up, issue the command show switch to verify the stack member number. If the number is used by another member in the stack, the switch selects the lowest available number in the stack.

From this link

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_example09186a00807811ad.shtml

I actually did it for each switch so I typed this:

Switch# switch 1 renumber 2
Switch# switch 2 renumber 1

reloaded without saving and it cam us as I wanted it

Thanks very much

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LVL 33

Accepted Solution

by:
MikeKane earned 2000 total points
ID: 24824760
Excellent - glad its working
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