From: James Bone (cciehead@yahoo.com)
Date: Tue Sep 02 2003 - 13:41:21 GMT-3
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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