... current version of BGP, including 17 72, 1773, 1774, 1930, 1966, 1997, 1998, 20 42, 23 85, 24 39, 25 45, 25 47, 27 96, 28 58, 29 18, 3065, 3107, 33 92, 422 3, and 427 1. BGP4 has many enhancements over ... through AS 64 520 : ̈ 64 520 64600 64700 ̈ 64 520 64600 64540 64550 64700 ̈ 64 520 64540 64600 64700 ̈ 64 520 64540 64550 64700 AS 645 12 does not see all these possibilities. AS 64 520 advertises ... routing policy in AS 64 520 . AS 645 12 will not learn of the second-best path or any other paths from AS 64 520 unless the best path of AS 64 520 becomes unavailable. Even if AS 645 12 were aware of another...