From: Alex Steer (alex.steer@eison.co.uk)
Date: Wed Sep 05 2007 - 08:47:09 ART
Funny you are asking this question. I had this exact problem about 5
minutes ago and was going to ask how to solve it. Lab16 by any chance?
Trace from r3 to r5 or look at r3 routing table. You will probably see
it using r4 as a next hop.
On one of the OSPF questions it asked you to prefer r4 due to it having
a high bw link. I did this with the ospf neigh cost command, the cause
of the problem I guess. To work around this (2 minute fix as I lazy) I
just configured the ebgp-multihop command on r3 for r5 so that traffic
can route through R4
Any body know how to produce a real fix for this?
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
ISolveSystems
Sent: 04 September 2007 17:06
To: Cisco certification
Subject: BGP neighbor not neighbor up
R3 connects to R4 and R5 via FR. R3 is the hub.
For some reason, R3 and R5 does not form BGP neighbor relationship. The
show ip bgp sum status shows OpenSent on one side and OpenConfirm on
another
side. Any suggestion?
Rack1R3(config-router)#
*Sep 4 16:34:02.907: %BGP-3-NOTIFICATION: sent to neighbor 154.1.0.5
4/0
(hold time expired) 0 bytes
Rack1R5(config-router)#
*Sep 4 16:39:16.031: %BGP-3-NOTIFICATION: sent to neighbor 154.1.0.3
4/0
(hold time expired) 0 bytes
R3
interface Serial0/0/0
ip address 154.1.0.3 255.255.255.0
encapsulation frame-relay IETF
ip ospf network point-to-multipoint non-broadcast
frame-relay map ip 154.1.0.4 304
frame-relay map ip 154.1.0.5 305
no frame-relay inverse-arp
frame-relay lmi-type cisco
end
Rack1R3(config-router)#do sh run | sec bgp
router bgp 300
no synchronization
bgp log-neighbor-changes
neighbor 154.1.0.4 remote-as 400
neighbor 154.1.0.4 send-community
neighbor 154.1.0.5 remote-as 400
neighbor 154.1.0.5 send-community
neighbor 154.1.13.1 remote-as 200
neighbor 154.1.13.1 send-community
neighbor 154.1.23.2 remote-as 200
neighbor 154.1.23.2 send-community
neighbor 154.1.38.8 remote-as 300
neighbor 154.1.38.8 send-community
no auto-summary
R5
interface Serial0/0/0
ip address 154.1.0.5 255.255.255.0
encapsulation frame-relay IETF
ip ospf network point-to-multipoint non-broadcast
ip ospf priority 0
frame-relay map ip 154.1.0.3 503
frame-relay map ip 154.1.0.4 503
no frame-relay inverse-arp
frame-relay lmi-type cisco
end
Rack1R5#sh run | sec bgp
router bgp 400
no synchronization
bgp log-neighbor-changes
neighbor 154.1.0.3 remote-as 300
neighbor 154.1.0.3 send-community
neighbor 154.1.45.4 remote-as 400
neighbor 154.1.45.4 send-community
no auto-summary
Rack1R5#
This archive was generated by hypermail 2.1.4 : Sat Oct 06 2007 - 12:01:09 ART