[prev in list] [next in list] [prev in thread] [next in thread] 

List:       isp-bgp
Subject:    [isp-bgp] Disapearing prefix problems
From:       "Chad Monteith" <chadlist () tspec ! net>
Date:       2003-06-25 16:05:01
[Download RAW message or body]

Hello List, 

I’m scratching my head on this one, hoping someone can help me….

We are providing transit to one of our clients that also has a
connection to AT&T.  They are advertising a single /24 they have
received from AT&T out both their AT&T feed and ours.  

Here’s what I’m having trouble with.  When I don’t advertise their
connection out my feed I can go to any route server and I see their /24
in the routing table.  Once I start advertising them to my upstreams, I
become the preferred path instead of AT&T in virtually all cases.

The client is sending the 7018:20 community to AT&T, and when I drop my
connection to them I can verify this is working since I do see their /24
instead of just the AT&T aggregate.

I’ve tried doing as path prepends to get incoming traffic to prefer the
AT&T feed, but no matter how long I make the path most route servers
still show our transit connection as preferred.

It should be noting, that AT&T is also one of our upstreams, along with
two other providers.  I’m wondering if that may have something to do
with it, but I may not be smart enough to figure out how :o)

Any helpful hints would be appreciated.
  


Thanks,
 
Chad Monteith
Technology Specialists
voice: 260.422.3979
fax: 260.422.5775



------------------------ANNOUNCEMENT---------------------------------
     *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
                         ** 802.11 Planet **
       The business of hot spots. Wireless ISP business plans.
      Wireless network certifications. High-gain antenna design.
                       Site survey techniques.
                       June 25 - 27, Boston, MA
             http://www.jupiterevents.com//80211/spring03
     *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-

_______________  The ISP-BGP Discussion List  ______________
To Join: mailto:join-isp-bgp@isp-bgp.com
To Remove: mailto:remove-isp-bgp@isp-bgp.com
Archives: http://isp-lists.isp-planet.com/isp-bgp/archives/

[prev in list] [next in list] [prev in thread] [next in thread]