I've seen this type of thing before with the random dropping and "hold time exceeded" message when a routing loop has been introduced.
Are you peering to a loopback on your peer's router, or to the directly connected physical link? Watch to be sure you aren't learning through BGP the connected links or loopback interfaces you are connecting to as this may be causing some issues. Do you have traceoptions on your bgp sessions at all? Perhaps that could give you better details as the routes all come in and your router tries to sort things all out, something is irritating it, so perhaps it will tell you why! BGP sorts a number of things out with its series of bestpath selection algorithms, but if you have done anything else to modify these or just exactly how/where bgp fits into the rest of your routing scenario it may cause issues. HTH, Scott -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Lee Hetherington Sent: Saturday, July 05, 2008 2:45 PM To: juniper-nsp@puck.nether.net 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 _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp