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New Member

Adding an additional port to working etherchannel bundle

Is there any method to adding an additional trunk link to an existing/working etherchannel bundle? Everytime I bundle several trunks between 2 2950's, everything works fine, then when I try to add another port after hooking up another cable, it always brings down the whole bundle (Port-channel) link. All links go completely off (no lights) with an errdisable. I have looked at a lot of show commands but nothing jumps out. Anybody want to suggest any general guidlines in doing this that has experience with this? I don't think it's possible to troubleshoot the issue over the forum, but perhaps some general guidlines in adding the additional trunk to the bundle would be appreciated and I will try them on my next build. Thanks in advance.

  • LAN Switching and Routing
2 ACCEPTED SOLUTIONS

Accepted Solutions
VIP Super Bronze

Re: Adding an additional port to working etherchannel bundle

Error disable is because the mode in on on. change it to

channel-group 1 mode desirable non-silent

http://www.cisco.com/en/US/tech/tk389/tk213/technologies_configuration_example09186a0080094647.shtml#errdisable

HTH

Reza

Purple

Re: Adding an additional port to working etherchannel bundle

    You need to bring all the ports up at the same time.  Do a shut on the portchannel SVI  .    Add the new port to the channel group,"channel-group X mode on " .   Then do a no shut on the port channel SVI ( interface port channel x) .

6 REPLIES
New Member

Re: Adding an additional port to working etherchannel bundle

PS: The issue probably has something to do with the timers, (and the errdisable expired) because I just fired up both switches and now all 5 trunks

are working in the bundle.....   Perhaps BPDU guard? I do not have Portfast enabled (obviously).

New Member

Re: Adding an additional port to working etherchannel bundle

One method that just solved the issue is to do all the logical configuration before plugging in the cable. Doesn't answer the question as to what precisely keeps crashing the bundle, but I think I'm going to consider this solved for now, come back to it later.

VIP Super Bronze

Re: Adding an additional port to working etherchannel bundle

Error disable is because the mode in on on. change it to

channel-group 1 mode desirable non-silent

http://www.cisco.com/en/US/tech/tk389/tk213/technologies_configuration_example09186a0080094647.shtml#errdisable

HTH

Reza

New Member

Re: Adding an additional port to working etherchannel bundle

Thanks! Absolutely worked and I was able to add a live port to the bundle on the fly.

Purple

Re: Adding an additional port to working etherchannel bundle

    You need to bring all the ports up at the same time.  Do a shut on the portchannel SVI  .    Add the new port to the channel group,"channel-group X mode on " .   Then do a no shut on the port channel SVI ( interface port channel x) .

New Member

Re: Adding an additional port to working etherchannel bundle

Yes, that worked! Thanks.

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