On Jan 14, 2009, at 6:19 PM, greg...@is.naist.jp wrote:
Thank you Renan,
well I think it cannot be helped. However, there is still a
question of why there are sets and sequences. When do sFlow
exporters will export AS path data as a set (unordered) and when do
they export these data as a sequence (ordered). There must be a
reason for the existence of both type of sets, right? Actually, I
would be ok with only sequences since they gave me the order of the
next ASs to come.
See S5.1.6 of RFC4271 for an explanation of why AS_SETS
exist.
AS_SETs are rare in today's Internet routing system, but
they do exist. A terse look at routeviews currently shows
only 46 routes with AS_SET out of 291464.
-danny
