From: Jon Carmichael (jonc@xxxxxxxxxxx)
Date: Tue Aug 14 2001 - 21:21:00 GMT-3
I just today caught a strange discrepancy between version 11.2, 12.0 and
12.1.
Originally all my routers within a confederation were configured similar to
the following...
router bgp 43
bgp confederation identifier 20
bgp confederation peers 42 44
But when configured as such, --there was a router external to the
confederation that was getting the error that looks like..
%BGP-6-ASPATH: Invalid AS path (43) 18 17 received from 172.20.100.1: Non
confederation peer
So I figured I would fix that by including the AS number of the border
router to the confederation with a change that puts 'his' autonomous system
number in the list of peers, -so that after the fix the config now looks
like...
router bgp 43
bgp confederation identifier 20
bgp confederation peers 42 43 44
I did this on all the routers, --three of them running 12.0 and one running
11.2, and it worked, the error popping up on the next door AS stopped. But
while I was running around to all the border routers trying to make the
similar config change, one of them popped up with an error while configuring
telling me you can't do that. --Paste of the config change attempt is
below. Turns out that 11.2, 12.0 will let you, --in fact in 12.0 you
*must* or a router in a next-door AS will complain if you don't and in 12.1
you can't!
Example while making the change in 12.1 follows.
Not a question, --just a curious discrepancy between different versions of
the code.
JONC
router bgp 43
no synchronization
no bgp log-neighbor-changes
bgp confederation identifier 20
bgp confederation peers 42 44
network 172.20.101.1 mask 255.255.255.255
timers bgp 3 9
neighbor 172.17.100.1 remote-as 17
neighbor 172.17.100.1 ebgp-multihop 2
neighbor 172.17.100.1 update-source Loopback0
neighbor 172.18.100.1 remote-as 18
neighbor 172.18.100.1 ebgp-multihop 2
neighbor 172.18.100.1 update-source Loopback0
neighbor 172.20.100.1 remote-as 43
neighbor 172.20.100.1 update-source Loopback0
no auto-summary
!
no ip classless
ip route 172.17.100.1 255.255.255.255 192.168.255.81
ip route 172.18.100.1 255.255.255.255 192.168.255.82
no ip http server
!
Fremont#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Fremont(config)#router bgp 43
Fremont(config-router)#bgp confed peers 42 43 44
% Local member-AS not allowed in confed peer list
**Please read:http://www.groupstudy.com/list/posting.html
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:31:51 GMT-3