Port Channel configuration on Hybrid 6509

[idexx]

Good day. I have two 6509s with SUP1a-2GEs installed. They are connected to each other via long haul fiber in a fully redundant configuration. Each SUP has 2 interfaces, and each 6509 has its total of 4 interfaces bundled together in a port channel. I have scoured the Cisco site looking for a way to alter the port channel bundle in such a way as to not bring the entire port channel down. That is to say, of the 4 interfaces that are included in the port channel, I would like to permanently remove 2 of the interfaces and create a new port channel with them. This new port channel will be attached to a third 6509. During this operation, the existing port channel will stay up and functioning.

Part of the current configuration looks like this:

set port channel 1/1-2 mode desirable silent (mod1)

set port channel 2/1-2 mode desirable silent (mod2)

set port channel 1/1-2,2/1-2 166

I understand the command to completely remove a port channel bundle:

set port channel 1/1-2,2/1-2 mode off

I don't think that is what I want to do if I need the port channel bundle to stay intact while I remove 2 of the interfaces. Anyone out there have any insight? Might it look like this?

set port channel 2/1-2 mode off

I would greatly appreciate any help.

Thanks.

Clay Hawks CCNP

Senior Network Analyst

clay-hawks@idexx.com

[alagrawa]

Hi Clay,

You can do the following.

Assuming you want to configure 2/1 and 2/2 to be in some other port channel bundle.

1. Shut port 2/1-2. This way any config change you make to these ports will not affect the current port channel.

set port disable 2/1-2

2. Configure port channel mode off for 2/1-2.

set port channel 2/1-2 mode off

3. Configure these ports to be in some other admin group

set port channel 2/1-2 200

'show port channel info all' will show you the admin groups in use currently. So you can choose an admin group number that is not being used already.

4. Configure the port channel mode to desirable for these ports

set port channel 2/1-2 mode desirable silent

Now port 2/1-2 will be part of their own port channel bundle.

Please feel free to write in if you need any further clarifications.

Hope that helps.

regards

-Alok

[idexx]

Thanks! I had hoped it would be something like that. Have you performed that operation before?

You undersand that I'll have to sing your praises upon successful conclusion of the cut-over. :-)

[alagrawa]

Hi Clay,

I havent done the exact same operation before. But am pretty confident that, that wil work.

goodluck :)

-alok

[idexx]

That did it, Alok. Thanks again.

[alagrawa]

Thats great. you're most welcome and thanks for letting us know it worked :)

warm regards

-Alok