draft-wkumari-idr-as0

October 24, 2011 at 00:05 · Filed under Routers & Routing

A trivial new Internet-Draft to deal with the issue that an AS number zero was never formally proscribed.

This document specifies that a BGP speaker MUST NOT originate or
propapate an announcement with an AS number of zero, and a BGP
listener MUST NOT accept an announcement which has an AS number of
zero in the AS-PATH attribute, and SHOULD log the fact that it has
done so.

In addition if a BGP listener recives zero as the peer AS in an OPEN
message, it MUST abort the connection and send a NOTIFICATION with
Error Code “OPEN Message Error” and subcode “Bad Peer AS” (see
[RFC4271] Section 6.2). Obviosuly enough, a router MUST NOT
initialte a connection claiming to be AS number zero.

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