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.
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) .
Error disable is because the mode in on on. change it to
channel-group 1 mode desirable non-silent