From: R. Adjakou (radjakou@cfao.sn)
Date: Thu Sep 04 2003 - 08:30:43 GMT-3
Try to fix the problem.
1/ On the ospf process, define the networks like this
net 172.16.20.0 0.0.0.255 area 0
net 172.16.1.0 0.0.0.255 area 0
2/ If not explicity aked, disable sync on bgp process
Give a feedback
Roberto Adjakou
----- Original Message -----
From: "James Bone" <cciehead@yahoo.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, September 02, 2003 5:41 PM
Subject: bgp to non-bgp to bgp
> Hello Group,
>
> I'm trying to understand why this is flapping.
>
> routera --------------routerb--------------------routerc
>
> routera is running BGP in AS 1
> routerb is running only OSPF. It cannot run BGP.
> routerc is running BGP in AS 2
>
> routera to routerb network is 172.16.20.0 mask 255.255.255.0
> routerb to routerc network is 172.16.1.0 mask 255.255.255.0
>
> On routerc, I advertised network 172.16.1.0 under bgp process using
network 172.16.1.0 mask 255.255.255.0
>
> Routera receives the route, 172.16.1.0 and placed in its routing table as
BGP learned route. However, it disappears every 60 seconds and the route
becomes OSPF learned route. Eleminating BGP and running only OSPF works but
I'm curious as to why this is happening. Can anyone explain why? Thanks in
advance.
>
> Relevant Configuration follows
>
> routera
>
> ethernet 0
> 172.16.1.1 255.255.255.0
>
> serial 1
> clockrate 64000
> 172.16.20.2 255.25.255.0
>
> router ospf 10
> network 172.16.0.0 0.0.255.255 area 0
>
> ************************************************************
> routerc
>
> serial 0
> 172.16.20.1 255.255.255.0
>
> router osp 10
> network 172.16.0.0 0.0.255.255 area 0
>
> router bgp 1
> neighbor 172.16.1.2 remote-as 3
> neighbor 172.16.1.2 ebgp-multihop 2
> no auto-summary
>
> ************************************************************
>
> routerf
>
> ethernet 0
> 172.16.1.2 255.255.255.0
>
> router ospf 10
> network 172.16.0.0 0.0.255.255 area 0
>
> router bgp 3
> network 172.16.1.0 mask 255.255.255.0
> neighbor 172.16.20.1 remote-as 1
> neighbor 172.16.20.1 ebgp-multihop 2
> no auto-summary
>
>
>
>
>
>
>
>
>
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This archive was generated by hypermail 2.1.4 : Wed Oct 01 2003 - 07:24:22 GMT-3