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4 Byte AS tested
flags destination gateway lpref med aspath origin
*> 22.214.171.124/24 126.96.36.199 100 0 0.3130 0.1239 0.4637 0.4637 0.4637 0.4637 0.4637 0.4637 0.1221 1.202 i
George Michaelson, Randy Bush and myself have successfully tested the implementation of 4Byte AS BGP on a public Internet transit. The above BGP RIB snapshot was taken at a 4Byte BGP speaker in North America, showing a transit path across AS 1221, AS 4637, AS 1239 and AS 3130 , with correct reconstruction of the originating AS at the other (4Byte AS) end.
The code base used was OpenBGPD, with 4 byte patches that I've added to the code in the past couple of weeks.
(Patched versions of openbgpd to include 4-byte AS support can be found at http://www.potaroo.net/tools/bgpd/)