[c-nsp] RE: Interesting iBGP problem

[Kevin]

I'll reply to myself on this one,
I've added a c5500-RSM to the ibgp mix with the config below, it's
running 12.1(20) For some reason it's not adding routes to the bgp table
at all, Is their something that I have todo specificly add bgp routes to
the routing table, with this older IOS? I did do next-hop-self on the
other two routers.

Kevin,


router bgp 25720
 bgp log-neighbor-changes
 neighbor 192.168.1.1 remote-as 25720
 neighbor 192.168.1.1 update-source Loopback0  
 neighbor 192.168.1.2 remote-as 25720  
 neighbor 192.168.1.2 update-source Loopback0

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Kevin
Sent: Monday, September 13, 2004 11:16 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Interesting iBGP problem

I have two 7500 routers, border1 and border2, border1 currently has a
GiGE to a backbone router, border2 will soon have an ds3 to another
providor. I have a GIGe connection between the routers.
Border2 has a brand new default config. Basically what I can tell is
happening is that when I configure iBGP between the two routers, border2
will insert all the ebgp routes from border1 into the routing table and
then about 1min later it'll remove all the routes out of the routing
table. Then after another minute the routes are back. Has anyone seen
this before? I checked to see if bgp was flapping, and it was'nt. I
checked for interface errors, their was'nt any.
I am running 12.3(8)T3 on these routers. Below are the bgp configs.


Kevin,


Border1:
router bgp 25720
 bgp log-neighbor-changes
 bgp bestpath compare-routerid
 neighbor 192.168.1.2 remote-as 25720
 neighbor 192.168.1.2 update-source Loopback0  neighbor 207.67.87.49
remote-as 4323  neighbor 207.67.87.49 description TWtelecom  neighbor
207.67.87.49 version 4  !
 address-family ipv4
 neighbor 192.168.1.2 activate
 neighbor 207.67.87.49 activate
 neighbor 207.67.87.49 next-hop-self
 neighbor 207.67.87.49 remove-private-as  neighbor 207.67.87.49
soft-reconfiguration inbound  neighbor 207.67.87.49 distribute-list
BGP_Advertisment out  neighbor 207.67.87.49 route-map tw-in in  no
auto-summary  no synchronization  network 199.199.208.0 mask
255.255.248.0  aggregate-address 199.199.208.0 255.255.248.0
summary-only  exit-address-family

Border2:

router bgp 25720
 no synchronization
 bgp log-neighbor-changes
 neighbor 192.168.1.1 remote-as 25720
 neighbor 192.168.1.1 update-source Loopback0  no auto-summary





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