[c-nsp] etherchannel problems

[Phil Bedard]

If you were using LACP then this should have taken the remote side out  
of the Etherchannel as well.  There is no knob to take the interface  
down during these conditions, but dynamic negotiation should solve the  
issue.

Phil

On Nov 19, 2007, at 11:11 AM, Holemans Wim wrote:

> We just got bitten by a serious etherchannel problem : we have an 2  
> gig
> etherchannel link between 2 campus.
> Someone on the other end misconfigured an interface (typed 6/1 instead
> of 1/6)  and had overwritten the allowed vlans on one of the  
> interfaces.
> As a result of this, the interface was thrown out of the bundle (at  
> that
> side only) BUT the interface stayed UP. On the other campus, both
> interfaces
> stayed in the bundle with very big problems as a result : the 6500 at
> that side considered both lines as valid and distributed the packets
> over both interfaces, sending half of the traffic in 'space'.
>
> If the interface had gone down as a result of the unbundling, there
> would have been no problem. We only use static channel settings, so  
> not
> etherchannel negotiations between switches. Can this be solved with
> dynamic etherchannel bundling ? Or someone has another solution for  
> this
> problem ?
>
> Wim Holemans
> Networkservices University of Antwerp
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