[c-nsp] RE: Interesting iBGP problem

[McCallum, Robert]

no sync would usually help :-0

Robert McCallum 
CCIE #8757 R&S
01415663448
07818002241 

> -----Original Message-----
> From: Kevin [mailto:kevin at honeycomb.net] 
> Sent: 14 September 2004 16:00
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] RE: Interesting iBGP problem
> 
> 
> 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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