4 Byte AS tested

Thu Jan 11 20:16:24 UTC 2007

At 04:59 AM 12/01/2007, Todd Underwood wrote:
>all,
>
>we (renesys) saw as23456 adjacent to both 1221 (expected) and 65001
>(not), originating two prefixes:
>
>203.10.62.0/24
>and
>203.10.63.0/24
>
>paths looked like:
>
><peer> 7474 1221 65001 23456 23456 23456
>and many similar

This particular path illustrates the point - in actual fact the 
trailing 3 entries were NOT instances of AS path prepending, but were 
in fact 2 byte AS translations of AS 1.101, AS1.102 and AS 1.103.

   Geoff