... 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 ... possible for AS 645 12 to reach networks in AS 64700 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 ... path through AS 64 520 and wanted to use it, AS 64 520 would not route packets along that other path because AS 64 520 selected 64 520 64600 64700 as its best path and all AS 64 520 routers will use...