[j-nsp] Odd BGP Issue

[Keegan.Holley at sungard.com]

Routing loop?

Can you post your bgp config?  Also, can you post the routes to the two 
addresses you peer with?

 
P Think before you print 
 
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"Lee Hetherington" <lee.hetherington at redtechnology.com> 
Sent by: juniper-nsp-bounces at puck.nether.net
07/05/2008 02:43 PM

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<juniper-nsp at puck.nether.net>
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Subject
[j-nsp] Odd BGP Issue






Hi All,

I have a very odd problem with a J Series router and wonder if anyone can 
help, as neither our providers nor JTAC can shed any light on this one.

We have a J2320-JH, it has a Link to AS1200 over a 2meg serial x.21 
connection and then a 100meg connection to AS1299 over ethernet.  I have 
bgp from our as accepting ANY from them and announcing a single /23 
network to them.

My original 2meg connection has been stable and running a BGP session with 
no flapping for almost 3 weeks now.  As soon as I introduce the new peer, 
the route table increases as you'd expect to around 500k routes, becomes 
stable with 245k active routes and then the originally stable connection 
starts to flap giving a Hold Timer Expired Error.  This then keeps 
flapping.

Whilst this first session is flapping there are no errors on the 
interfaces to either AS1200 or AS1299.  However, whilst the session is 
flapping I note that almost exactly 1mbits/sec is going out of our new 
AS1299 connection and comming into our AS1200 connection.  This traffic 
however does not come onto our LAN as the gig connection to our switch is 
showing none or very minimal traffic.

The guys at AS1200 havent got back to me yet, but the guys from AS1299 
have told me to check my prefix-limit, but I dont currently have this 
configured.  JTAC tell me my router is fine and my configuration is 
correct.

Anyone have an idea?  The providers seem to be stumped but this leaves me 
with one peer disabled currently.

Thanks,

Lee



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