From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Sat Sep 02 2006 - 17:57:09 ART
Hey I forgot
Your routers can debug to the Dump Level :D
You can then use your favorite GUI Sniffer and paste that information to see
what is carrying inside ;)
Thanks Brian for that TIP, It saved my b.. in a real Problem at work
R4#deb ip packet du
IP packet debugging is on (dump)
R4#
*Mar 1 00:41:01.883: IP: tableid=0, s=2.2.2.2 (Serial0/0.346), d=150.1.4.4
(Loopback0), routed via RIB
*Mar 1 00:41:01.883: IP: s=2.2.2.2 (Serial0/0.346), d=150.1.4.4, len 44,
rcvd 4
03700350: 64610800 45C0002C 00000000 da..E@.,....
03700360: FD06B201 02020202 03030404 BD6E00B3 }.2.........=n.3
03700370: 61D2D946 00000000 60024000 577D0000 aRYF....`.@.W}..
03700380: 02040218 ....
*Mar 1 00:41:01.887: IP: s=150.1.4.4 (local), d=150.1.2.2, len 40,
unroutable
03700AD0: 45000028 04DF0000 E..(._..
03700AE0: FF06ABE9 03030404 02020202 00B3BD6E ..+i.........3=n
Rack3R4#
03700AF0: 00000000 61D2D947 50140000 AB8A0000 ....aRYGP...+...
03700B00:
*Mar 1 00:41:02.479: IP: s=150.1.4.4 (local), d=224.0.0.1 (Serial0/0.24),
len 28, sending broad/multicast
03701D90: 45C0001C 04E00000 E@...`..
03701DA0: 0102B938 03031804 E0000001 1164EE9B ..98....`....dn.
03701DB0: 00000000 ....
Rack3R4#
*Mar 1 00:41:03.483: IP: s=192.10.1.4 (local), d=224.0.0.1
(FastEthernet0/0), len 28, sending broad/multicast
03701890: 45C0001C 04E10000 E@...a..
037018A0: 01021330 C00A0104 E0000001 1164EE9B ...0@...`....dn.
037018B0: 00000000 ....
-----Mensaje original-----
De: Victor Cappuccio [mailto:cvictor@protokolgroup.com]
Enviado el: Sabado, 02 de Septiembre de 2006 04:45 p.m.
Para: 'jnkmail4eva@yahoo.com'; 'ccielab@groupstudy.com'
Asunto: RE: BGP question
Yes you can use deb ip bgp
You would receive a output like
BGP: 150.1.3.3 bad OPEN, remote AS is 51, expected 50
HTH
Victor.-
-----Mensaje original-----
De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de
jnkmail4eva@yahoo.com
Enviado el: Sabado, 02 de Septiembre de 2006 03:58 p.m.
Para: ccielab@groupstudy.com
Asunto: BGP question
I am trying to cover bgp this weekend and came across quite a tricky issue :
Router A and Router B use to have bgp neighbor relationship.
Router A has new admin and new AS. It has no control over router B.
Router A reconfigures his bgp configuration with new AS but in order to keep
the old neighbor relationship with B it uses the local AS command.
But, the new admin on router A does not know the old AS.
I have tried several ways to identify the AS from debug commands without any
success.
BGP notification on A "wrong AS message" only shows part of the payload of
the first packet.
BGP notification on B "wrong AS message" shows the entire payload of two
packets inclusive of the correct AS. Since I don't have access to router B I
can't see the notification mesage.
I wish routers ran etherreal ..:-)
Also, no confederations to be used.
Anyone like to take a byte at it ...
This archive was generated by hypermail 2.1.4 : Sun Oct 01 2006 - 16:55:39 ART