Re: BGP Not Advertising Locally Connected Network

Hi LG.

You are trying to oversimplify things here, two routers are not enough
to properly demonstrate BGP backdoor feature. Please have a look here
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800c95bb.shtml#bgpbackdoor

Cheers,
A.

On 5/24/2010 11:07 PM, Ladee Geek wrote:
> Hi All -
>
> this is a very very simple set up of eBgp peering via loopbacks and then
> advertising the local loopbacks. The idea is to get the candidate to
> realize the recursive routing issue and to use the backdoor command for the
> network statements. The problem is, my routers are not advertising the
> loopbacks? Any ideas?
>
>
> R4<--> R2
>
> router bgp 400
> no synchronization
> bgp router-id 172.16.104.1
> bgp log-neighbor-changes
> network 172.16.104.0 mask 255.255.255.0 backdoor
> neighbor 172.16.102.1 remote-as 200
> neighbor 172.16.102.1 ebgp-multihop 255
> neighbor 172.16.102.1 update-source Loopback104
> no auto-summary
>
> R4#s bgp sum
> BGP router identifier 172.16.104.1, local AS number 400
> BGP table version is 1, main routing table version 1
> Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
> State/PfxRcd
> 172.16.102.1 4 200 38 38 1 0 0
> 00:36:35 0
>
>
> R4#sho ip bgp - you notice NOTHING is in the table
>
> R4#
>
> R4#sho ip bgp neighbors 172.16.102.1 advertised-routes
> Total number of prefixes *0 *
>
> interface Loopback104
> ip address 172.16.104.1 255.255.255.0
> ip pim sparse-mode
> ip igmp join-group 239.255.1.1
> ip ospf network point-to-point
>
>
> R4#show ip route 172.16.102.0
> Routing entry for 172.16.102.0/24
> Known via "ospf 1", distance 110, metric 20, type extern 2, forward metric
> 3
> Redistributing via rip
> Advertised by rip metric 15
> Last update from 172.16.10.6 on FastEthernet0/1, 00:41:06 ago
> Routing Descriptor Blocks:
> * 172.16.10.6, from 172.16.102.1, 00:41:06 ago, via FastEthernet0/1
> Route metric is 20, traffic share count is 1

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Received on Tue May 25 2010 - 00:18:02 ART