Interface numbering in a Cisco 3750 stack

Posted on 2009-07-10
Medium Priority
Last Modified: 2012-05-07

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

Question by:ally0000
  • 3
  • 2
LVL 33

Expert Comment

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

no switch <stack number> provision <switch model>


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

Author Comment

ID: 24824386

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.

LVL 33

Expert Comment

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.

Author Comment

ID: 24824618

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


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

LVL 33

Accepted Solution

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

Featured Post

Turn Raw Data into a Real Career

There’s a growing demand for qualified analysts who can make sense of Big Data. With an MS in Data Analytics, you can become the data mining, management, mapping, and munging expert that today’s leading corporations desperately need.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

As dyndns has reduced the capabilities of the free service, I looked around for other free providers of Dynamic DNS service. After testing several I decided to move my DNS hosting to Hurricane Electric as then domains that require dynamic hostnam…
Data center, now-a-days, is referred as the home of all the advanced technologies. In-fact, most of the businesses are now establishing their entire organizational structure around the IT capabilities.
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …

627 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question