[c-nsp] BGP over Etherchannel Issue

[Chris Kilian]

You could also look at possibly using a combination of pagp as well as BFD which is very good if you have not used it before



Regards

Chris Kilian
Tier 2 Network Engineer
AOL Broadband
80 Hammersmith Road,
London, UK, W14 8UD
Tel: +44 207 348 4762
Mobile: +44 07515031780
AIM: chriskilianck

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Oliver Boehmer (oboehmer)
Sent: 06 October 2008 15:34
To: domintefamily at yahoo.co.uk; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] BGP over Etherchannel Issue

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
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