>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.
Do your contracts with them explicitly say they will readvertise
every route you send them, of whatever prefix length?
>
>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
Are these separate locations of your customer, or what? What is the
benefit of your upstream providers reannouncing the more specific
route? It may be advantageous for your customer to present
more-specific routes to you if the /24 prefixes represent sites
connected to you in different locations, but what, if anything, will
an upstream provider do with this information if they only connect to
you at one point?
>
>At our side we have confirmed annoucing them
>
>
>At our upstream providers we have also confirmed that
>they are announcing them
I'm not clear which providers you mean, or whether AT&T is one of them.
>
>but when I go to AT&T route server to do a bgp of
>these networks they seem to only recognise the
>supernet
It's entirely possible AT&T is filtering out the more specific
routes. Filtering, as opposed to proxy aggregating.
>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
>
>
>
>__________________________________________________
>Do You Yahoo!?
>Get email at your own domain with Yahoo! Mail.
>http://personal.mail.yahoo.com/
>
>_________________________________
>FAQ, list archives, and subscription info:
>http://www.groupstudy.com/list/cisco.html
>Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
_________________________________
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
