AFAIK, I don't think this is possible.  Most of the implementations of
etherchannel I've seen (I could be wrong, but someone will let me know I'm
sure) require the the ports in the etherchannel be contiguous.

It is possible with newer version of the IOS, however, to perform
Multichassis PPP Multilink.  Perhaps this could be used to help your
situation.

Back on the topic of wierd conditions for etherchannel to work, I found a
document talking about Etherchannel on the Cat5000.  For instance, if you
have a blade of 12 - fastethernet ports in a 5000, there are only certain
ways you can setup your etherchannels.  In the following (ASCII) example,
each letter will represent a switchport with an 'x' indicating 'not in use'
and '|' indicates a break in the logical 4 port grouping the EtherChannel
Bundling Controller (EBC) sees:

AAAA | BBBB | CCCC
This is valid, three channels of four ports each.

AABB | CCxx | DDEE
This is valid, but it will be viewed as six channels of 2 ports each.

AAAA | BBxx | xxxx
This is valid, one channel of four ports, and one channel of 2 ports.

xxAA | AAxx | xxxx
This is invalid, as all ports aren't in the same group (of 4 ports)

xxAA | xxxx | xxxx
This is invalid, as you cannot channel ports 3/4 without ports 1/2 in a 4
port group.

xAAA | xxxx | xxxx
This is invalid:  only 3 ports in the channel.

xAAx | xxxx | xxxx
This is invalid as channels MUST start with an odd numbered port.

Just though it was interesting enough to share =)

Mike W.




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