[j-nsp] BGP session going down on 'invalid attribute list'

[Rutger Bevaart]

On 4-jan-2007, at 16:27, Paul Goyette wrote:

IF 4-byte ASNs is a negotiated capability,
AND IF we negotiated to NOT PERMIT 4-byte ASNs
AND  the peer sent us a 4-byte ASN anyway,

THEN YES, this is sufficient reason to drop the session
since the peer has violated the negotiated agreement.

That's sort of the whole point of BGP's capability
negotiation.

Agreed, but AFAIK there are no 32-bit ASN aware software releases from
Cisco, Foundry or Juniper. As our peer is running on Foundry RX it seems
unlikely to be the reason. And the 4 AS'es in between happily passed this
information on without going down.

I will ask the upstream party for some more logging and details!