[j-nsp] Odd BGP Issue

[Shane Ronan]

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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