The Internet consists of thousands of autonomous systems (ASs), each advertising one or more prefixes it has connectivity to. According to RFC 1930, each prefix should originate from a single AS. However, more than one ASs may advertise reachability to a given prefix, so called multiple origin AS conflict (MOAS). To this end, this paper analyzes and quantifies MOAS conflicts from a dataset consisting of routing updates collected over 21 days in January, 2007, and presents ten scenarios that lead to MOAS conflicts. |
[ pdf ] |