Re: BGP backdoor

Backdoor acts on routes learnt from eBGP ( changes AD from 20 to 200 )
I see both are in same AS .

Can u give more insights on addressing

On Fri, Sep 3, 2010 at 11:09 AM, selamat pagi <ketimun_at_gmail.com> wrote:
> 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 - 11:31:53 ART