From: raul raul (juvenn@hotmail.com)
Date: Thu Sep 20 2007 - 10:44:03 ART
Yes mate ;
u got my Question
thanks
> Date: Thu, 20 Sep 2007 13:18:11 +0000> From: markom@vodafone.is> To: ccielab@groupstudy.com> Subject: Re: BGP - Simple Question> > > how to find out remote router AS ,without accessing that router.> > i am able to ping that router and use sort of debug command but still not able> > to identify remote router as.> > is it away to find out ?> > There was a discussion about this the other day on this very forum.> > Say that you have two routers R1 and R2:> > R1---(192.168.12.0/24)---R2> > R1: 192.168.12.1; AS100> R2: 192.168.12.2; AS200> > You configure peering like this:> > R1:> router bgp 100> bgp log-neighbor-changes> neighbor 192.168.12.2 remote-as 500> !> > R2:> router bgp 200> bgp log-neighbor-changes> neighbor 192.168.12.1 remote-as 100> !> > After short period of time, error messages like these will start popping up> (unless you guess ASN by some chance):> > > *Sep 20 13:05:30.307: %BGP-3-NOTIFICATION: sent to neighbor> > 192.168.12.2 2/2 (peer in wrong AS) 2 bytes 00C!
8> > The hex number 00C8 at the end of the message indicates what ASN is> configured on the remote router. 0x00C8 = 200. Based on that, you> can change your configuration.> > > This is sometimes confusing issue, so here's a bit more clarification.> > Notice that other end will also get log messages:> > > *Sep 20 13:12:44.343: %BGP-3-NOTIFICATION: received from neighbor> > 192.168.12.1 2/2 (peer in wrong AS) 2 bytes 00C8> > The difference is in "received from neighbor", as opposed to "sent to> neighbor". Notification will be sent from the peer that has neighbor> statement configured to something othar than remote BGP process is> configured to. > > In a lab scenario, if you are connecting to BB router and you get message> with "notification received", that will indicate that you may need to use> "local-as" in order to establish peering. In the case of "notification> sent", neighbor statement needs to be fixed accordingly.> > Kind regards,> Marko (#18427)> > __________________!
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