BGP flapping

From: ccie2be (ccie2be@nyc.rr.com)
Date: Tue Jun 22 2004 - 00:40:43 GMT-3


Hi Guys,

This has been bothering me most of today. I just can't figure it out.

I'm doing a practice lab and R6 has 2 pppoATm connections to BB1. The configs
are shown below.

Aside from BGP, there aren't any other routing protocols running between R6
and BB1.

I tried using ( and not using) nei... ebgp multihop and the same for nei ...
update-source lo0.

Nothing seems to make any difference. The BGP session just keeps flapping up
and down.

Anyone know what's going on here? If so, please tell me what I should do to
correct this annoying problem.

Thanks kindly, Tim

interface ATM1/0
 no ip address
 no atm ilmi-keepalive
 pvc 0/16 ilmi
 !
!
interface ATM1/0.206 point-to-point
 pvc 0/206
 --More--
11:50:11: %BGP-5-ADJCHANGE: neighbor 54.6.8.254 Down Peer closed the session
  broadcast
  encapsulation aal5snap
  protocol ppp Virtual-Template1
 !
!
interface ATM1/0.306 point-to-point
 pvc 0/306
  encapsulation aal5snap
  protocol ppp dialer
  dialer pool-member 1
 !

router bgp 100
 no synchronization
 bgp log-neighbor-changes
 network 142.6.40.0 mask 255.255.248.0
 neighbor 54.6.7.254 remote-as 54
 neighbor 54.6.7.254 ebgp-multihop 255
 neighbor 54.6.7.254 update-source Loopback0
 neighbor 54.6.8.254 remote-as 54
 neighbor 142.6.46.4 remote-as 45
 neighbor 204.12.6.3 remote-as 200
 neighbor 204.12.6.254 remote-as 54
 no auto-summary

 --More--
11:51:34: %BGP-5-ADJCHANGE: neighbor 54.6.7.254 Up
 --More--
11:51:46: %BGP-5-ADJCHANGE: neighbor 54.6.8.254 Up
 --More--



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