[c-nsp] Gracefully remove a port from Etherchannel

[Pete Templin]

Ed Butler wrote:
> Yesterday we unplugged a port from etherchannel, and were not expecting
> this to affect traffic flow. However, the logs on the Cisco 3750 show
> the OSPF adjacency went down and immediately came back up.
> 
> 1) Is this supposed to happen?
> 2) Is there a way of gracefully removing a port from an etherchannel (eg
> shutdown) to ensure problems don't get caused?
> 3) If the answers to the above are "Yes" and "No" respectively, should
> etherchannel be used to give some redundancy?

I think xEC bundles tend to burp when transitioning to/from 1 link in 
the bundle.  EtherChannel resiliency comes from having 3+ members in the 
bundle, so that a link status change keeps you over the magic number 2.

pt