Solved: Assigning etherchannel numbers

hmukite34 · ‎05-23-2013

Hi guys. So I have three switches connected together.A,B and C with redundant links. When creating etherchannels, I named the A-B link as channel-group 1. What will be the result of naming another link, say, B-C or A-C channel-group 1?

Reza Sharifi · ‎05-23-2013

Hi,

It will work fine since the portchannel ids are locally significant. But the result would be that now you have the same porchannel id that connects to multiple switches and that can get very confusing.

The other problem with this type design is this, let say you have 2 portchannels with the same id. One is connectiong to server and the other one to another switch. Now how would you configure the server potchannel as access mode and the switch portchannle as trunk?

HTH

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Reza Sharifi · ‎05-23-2013

Hi,

It will work fine since the portchannel ids are locally significant. But the result would be that now you have the same porchannel id that connects to multiple switches and that can get very confusing.

The other problem with this type design is this, let say you have 2 portchannels with the same id. One is connectiong to server and the other one to another switch. Now how would you configure the server potchannel as access mode and the switch portchannle as trunk?

HTH

Leo Laohoo · ‎05-23-2013

Port channel numbers are "locally significant" and won't break anything if A-B, for example, have different port channel numbers.

The most important thing is to know which etherchannel goes to where. This can easily be achieved by putting a description of the physical and etherchannel links.