[c-nsp] BGP over Etherchannel Issue

[Oliver Boehmer (oboehmer)]

C and C Dominte <> wrote on Monday, October 06, 2008 4:22 PM:

> 
> I am having a rather unusual issue, and I have no idea on
> how or where to find any info about it.
>
> Basically, a bgp session configured over an etherchannel
> (2x10G ports) goes down, if one cable is removed. This should not
> happen under normal circumstances, as the physical disconnection,
should not
> affect the Etherchannel operation, as long as there is at least one
connected
> port in operation. 
> The IP addresses are configured over a VLAN, which is then allowed on
> the etherchannel trunk. 
> When I removed one of the two fibers, the bgp session went down, and
> in the reset log the reason was peer closed the session, on both
> sides.  

Are you running LACP or PaGP across the channel? If you're not, the
remote end might not have noticed the member leaving the bundle and
continued transmitting data over it, and if the BGP control packets
happened to hash to this member link, the session will go down..

	oli