Patent ID: 7885277

Claim:
A method comprising: obtaining from first or second border routers of a first autonomous system (AS) first and second routing information advertised by respective third and fourth border routers of a second AS, the first routing information including a first route attribute for a first route within the second AS to a prefix associated with the second AS, the second routing information including a second route attribute for a second route within the second AS to the prefix, wherein the second AS is a peer of the first AS, the first and third border routers being communicatively coupled via a first AS-to-AS link, and the second and fourth border routers being communicatively coupled via a second AS-to-AS link; determining whether one of the first or second AS-to-AS links is advertised as an inferior AS-to-AS link by the second AS based on the advertised first and second route attributes; and when the one of the first and second AS-to-AS links is identified as inferior, determining whether a routing impact is present within the first AS due to the inferior AS-to-AS link.