From: Mike Kraus \(mikraus\) (mikraus@cisco.com)
Date: Thu Jun 28 2007 - 19:11:15 ART
What if you add the mask to your network statement? (network 150.1.4.0
mask 255.255.255.0 backdoor)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Sadiq Yakasai
Sent: Thursday, June 28, 2007 4:37 PM
To: Cisco certification
Subject: BGP Backdoor Routing issue
hi Guys,
Can someone help out here please? See setup below:
(150.1.4.4)
lo0
| rip (155.1.45.0)
R4 ------------------------------------------------- R5
| |
| |
|ebgp |ebgp
| |
|---------------------R3 -----------------------------|
R4 is advertising lo0 (150.1.4.0) into bgp to R5 (via R3, who is an ebgp
peer to R4 as well)
R4 is doing rip on the link to R5
R5 is receiving the same route from both protocols (bgp & rip). I have
confirmed this as you will see later on.
I issue the network 150.1.4.0 backdoor command on R5, but it doesnt
install the 150.1.4.0 route in the IP routing table as an rip route
(which is the reason for the backdoor routing in the first place place i
presume).
Pls is there anything i am not getting right here? I have read all the
text on it that I can find (Routing TCP/IP vol 2, Internet Routing
Architecture, BGP Command and Config Handbook, CCO) but to no avail.
Now i am getting frustrated! I need help! :-)
R5:
R5#sh run | b router bgp
router bgp 5
no synchronization
bgp log-neighbor-changes
network 150.1.4.0 backdoor
neighbor 155.1.0.1 remote-as 1
no auto-summary
!
router rip
version 2
network 155.1.0.0
no auto-summary
R5#
R5#sh ip rout | inc 150.1.4
B 150.1.4.0 [20/0] via 155.1.0.1, 00:30:05 <---------at this
point, the bgp route is on the ip routing table
R5#conf t
R5(config)#router bgp 5
R5(config-router)#no neighbor 155.1.0.1 remote-as 1
R5(config-router)# do clear ip rout *
R5(config-router)#do sh ip rout
R 150.1.4.0 [120/1] via 155.1.45.4, 00:00:03, Serial0/3/0
<--------- i clear the bgp neigb and the rip route makes it
to the routing table
R5(config-router)#neighbor 155.1.0.1 remote-as 1 <--------- i
restore the bgp neig and it reverts!
R5(config-router)# do clear ip rout *
*Jun 28 21:28:14.277: %BGP-5-ADJCHANGE: neighbor 155.1.0.1 Up
R5(config-router)# do clear ip rout * R5(config-router)#do sh ip rout
B 150.1.4.0 [20/0] via 155.1.0.1, 00:00:03
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