Hmmm.. Looks like somobody inject this routes into IGP
and does auto-summary at him exiting router.
suaveguru wrote:
>
> hi all,
> I have a question regarding announcement of routes via
> BGP.
>
> Well we are an INTERNET BACKBONE FOR our customers who
> are ISPs .
>
> As a result we have many upstream providers like AT&T
> , ABOVENET etc.
>
> Recently our customers just have this new network
> blocks namely 146.222.185.0 /24, 146.222.186.0 /24 and
> 146.222.195.0 /24
>
> At our side we have confirmed annoucing them
>
> At our upstream providers we have also confirmed that
> they are announcing them
>
> but when I go to AT&T route server to do a bgp of
> these networks they seem to only recognise the
> supernet
>
> as show below
> route-server.ip.att.net> sh ip bgp 146.222.185.0
>
> BGP routing table entry for 146.222.0.0/16, version
> 13292503
> Paths: (18 available, best #14)
> Not advertised to any peer
> 7018 174 12018, (received & used)
> 12.123.29.249 from 12.123.29.249 (12.123.29.249)
> Origin IGP, localpref 100, valid, external
> Community: 0:5000
>
> ...
>
> AT&T sees the /16 supernet and not the specific that I
> am sending you
>
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