[j-nsp] Odd BGP Issue

[Scott Morris]

At 2meg, I'm not sure that would qualify as a good idea even if it were
stable!  :)   Although I guess that depends on what part of the world you
are in and what tier an ISP we were talking about! 

-----Original Message-----
From: Shane Ronan [mailto:sronan at fattoc.com] 
Sent: Saturday, July 05, 2008 3:20 PM
To: swm at emanon.com
Cc: 'Lee Hetherington'; juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] Odd BGP Issue

Or maybe they wouldn't be upset if you were providing a reliable link
between two previously un-peered AS's.


On Jul 5, 2008, at 12:11 PM, Scott Morris wrote:

> HA!  You are correct that they SHOULDN'T accept that from you, but....  
> Best
> ideas are not always implemented.  :)   Just make sure you have a  
> reject at
> the end of your export policy to then and it'll be much better then!
>
> Otherwise, enjoy making their route table a bit mental, but if it's 
> the same AS you're peering with over two links you really aren't 
> messing up the whole world, so nothing huge!  More people would be 
> reacting and upset with you if you were transiting between two 
> DIFFERENT ASNs! (smirk)
>
> Scott
>
> -----Original Message-----
> From: Lee Hetherington [mailto:lee.hetherington at redtechnology.com]
> Sent: Saturday, July 05, 2008 3:11 PM
> To: swm at emanon.com; juniper-nsp at puck.nether.net
> Subject: RE: [j-nsp] Odd BGP Issue
>
> Thanks Scott...
>
> I am peering with interface addresses...
>
> I have specific export statements which export a particular filter 
> list, which only includes a /23 of addresses.  For some reason when 
> showing what I am advertising to AS1200 i'm announcing the full route 
> table.  I am surprised an ISP would accept such routes from me, I 
> expect their network is going a bit mental every time I fire up the 
> session again.
>
> Lee
>
>
>
> -----Original Message-----
> From: Scott Morris [mailto:swm at emanon.com]
> Sent: Sat 05/07/2008 20:02
> To: Lee Hetherington; juniper-nsp at puck.nether.net
> Subject: RE: [j-nsp] Odd BGP Issue
>
> 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: juniper-nsp-bounces at puck.nether.net
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Lee 
> Hetherington
> Sent: Saturday, July 05, 2008 2:45 PM
> To: juniper-nsp at 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
>
>
>
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