On Thu, Dec 01, 2011 at 04:56:43PM -0500, Jeff Tantsura wrote:
Hi,
Let me take it over from now on, I'm the IP Routing/MPLS Product Manager at Ericsson responsible for all routing protocols. There's nothing wrong in checking ASN in AGGREGATOR, we don't really want see ASN 0 anywhere, that's how draft-wkumari-idr-as0 (draft-ietf-idr-as0-00) came into the worlds.
This draft says that If a BGP speaker receives a route which has an AS number of zero in the AS_PATH (or AS4_PATH) attribute, it SHOULD be logged and treated as a WITHDRAW. This same behavior applies to routes containing zero as the Aggregator or AS4 Aggregator. but observed behaviour was more like following: If a BGP speaker receives [bad route] it MUST close session immediately with NOTIFICATION Error Code 'Update Message Error' and subcode 'Error with optional attribute'. -- In theory, there is no difference between theory and practice. But, in practice, there is.