as_path question

[Mikhail A. Grishin]

Matthew Walster wrote, 05.07.2011 16:07:
> 2011/7/5 Mikhail A. Grishin<magr at ripn.net>:
>> What purpose of  '{' and '}' at BGP.as_path output?
>
> It indicates an "AS Set" - some aggregation happened, the longer
> routes of which were in the two ASNs in the brackets.
>
>> Why at 'show route' we see only '[i]'? (expected to see the first AS in
>> as_path)
>
> IMO, it should show AS48467 as they were the aggregator.

Moreover, this prefix (94.228.160.0/20) was filtered and not accepted 
because of this BIRD structure:
# Apply as_path filters on the last AS (originated route)
   allas = [ 15905, 34211, 41206, 44116, 44893, 47773, 48467, 50875, 
51031, 51186, 51443, 52163 ];
   if ! (bgp_path.last ~ allas) then reject;

So bgp_path.last doesn't hit to 48467 in this case.
Is this normal?

>
> Matthew Walster