BGP backdoor

Trying to understand the usage of backdoor command in BGP.

This is my Lab-setup. With the neigbors-loopbacks configured as backdoor, I
would expect to see CE7 lo on CE8 as a RIP-route.
But I still get the eBGP route vie PE.

 ------------------------------------RIP ----------------------------------
 |
|
CE7 -- eBGP --- PE2 --- MPLS --- PE5 -- eBGP -- CE8

CE7
interface Loopback0
 ip address 10.5.7.7 255.255.255.0

router bgp 200
 no synchronization
 bgp router-id 10.5.7.7
 bgp log-neighbor-changes
 network 10.5.7.0 mask 255.255.255.0
 network 10.5.8.0 mask 255.255.255.0 backdoor
 neighbor 10.5.27.2 remote-as 100
 neighbor 10.5.27.2 allowas-in

CE8
interface Loopback0
 ip address 10.5.8.8 255.255.255.0

router bgp 200
 bgp router-id 10.5.8.8
 network 10.5.7.0 mask 255.255.255.0 backdoor
 network 10.5.8.0 mask 255.255.255.0
 neighbor 10.5.58.5 remote-as 100
 neighbor 10.5.58.5 allowas-in

R8#sh ip route
     158.5.0.0/32 is subnetted, 1 subnets
B 158.5.6.6 [20/0] via 10.5.58.5, 14:53:51
     10.0.0.0/24 is subnetted, 5 subnets
C 10.5.8.0 is directly connected, Loopback0
B 10.5.7.0 [20/0] via 10.5.58.5, 00:00:06 <-- would expect to
get this via RIP
R 10.5.27.0 [120/1] via 10.5.78.7, 00:00:18, Vlan78
C 10.5.58.0 is directly connected, Vlan58
C 10.5.78.0 is directly connected, Vlan78

What do I miss here ?

Thanks, keti

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800c95bb.shtml#bgpbackdoor

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Received on Fri Sep 03 2010 - 07:39:43 ART