From: Ash (nester2k@gmail.com)
Date: Sun Sep 23 2007 - 02:51:00 ART
I agree with Joe's analysis. If you closely look at the R3 RT, there's no
route for 155.1.0.5 which is the next hop for 155.1.5.0 subnet. thus the
recursive lookup fails preventing BGP from promoting this route to valid and
best "*>" and installing it in the RT.
a simple fix would be to put the "next-hop-self" on the R2-R3 neighbor
statement. Alternately, you can use an outbound route-map and change the
next hop as well.
best,
On 9/23/07, John <jgarrison1@austin.rr.com> wrote:
>
> I'm having a problem with this lab. on R2 my BGP table is
>
> Network Next Hop Metric LocPrf Weight Path
> *> 155.1.5.0/24 155.1.0.5 0 0 1 i
> *> 155.1.37.0/24 155.1.23.3 0 100 0 (65013) i
> *> 204.12.1.0 155.1.13.1 0 100 0 (65013) 3 i
>
> my routing table on R2
>
> B 204.12.1.0/24 [200/0] via 155.1.13.1, 00:19:31
> 155.1.0.0/24 is subnetted, 5 subnets
> C 155.1.23.0 is directly connected, Serial2/1
> D 155.1.13.0 [90/2681856] via 155.1.23.3, 00:47:15, Serial2/1
> C 155.1.0.0 is directly connected, Serial2/0.1
> B 155.1.5.0 [20/0] via 155.1.0.5, 00:19:11
> B 155.1.37.0 [200/0] via 155.1.23.3, 00:19:31
>
> So R2 looks like it should all routes that should be are there.
>
> R3 has the same BGP table as R2 ie everything that shpould be there is,
> but
> there is one route missing in the routing table
>
> B 204.12.1.0/24 [200/0] via 155.1.13.1, 01:03:15
> 155.1.0.0/24 is subnetted, 3 subnets
> C 155.1.23.0 is directly connected, Serial2/3
> C 155.1.13.0 is directly connected, Serial2/2
> C 155.1.37.0 is directly connected, FastEthernet0/0
> Rack1R3#
>
> 155.1.5.0 network is no there. It's being advertised by confed BGP,
> because
> it's in the BGP table.
>
> Network Next Hop Metric LocPrf Weight Path
> * 155.1.5.0/24 155.1.0.5 0 100 0 (65002) 1 i
> *> 155.1.37.0/24 0.0.0.0 0 32768 i
> *>i204.12.1.0 155.1.13.1 0 100 0 3 i
> Rack1R3#sh ip route
>
> but it gets better because when you look at R1's BGP table the 155.1.5.0
> network is not there.
>
> My config is the same as the answer key's Why does R2 have all the routes
> and
> from R3 upstream the route seems to drop off. here is the BGP and eigrp
> configs of R1-R3
>
> R1
> router eigrp 2
> network 155.1.13.1 0.0.0.0
> no auto-summary
> !
> router bgp 65013
> no synchronization
> bgp log-neighbor-changes
> bgp confederation identifier 2
> neighbor 155.1.13.3 remote-as 65013
> neighbor 155.1.13.3 next-hop-self
> neighbor 155.1.146.4 remote-as 3
>
> R2
>
> router eigrp 2
> network 155.1.23.2 0.0.0.0
> no auto-summary
> !
> router bgp 65002
> no synchronization
> bgp log-neighbor-changes
> bgp confederation identifier 2
> bgp confederation peers 65013
> neighbor 155.1.0.5 remote-as 1
> neighbor 155.1.23.3 remote-as 65013
> no auto-summary
>
> R3
>
> router bgp 65013
> no synchronization
> bgp log-neighbor-changes
> bgp confederation identifier 2
> bgp confederation peers 65002
> network 155.1.37.0 mask 255.255.255.0
> neighbor 155.1.13.1 remote-as 65013
> neighbor 155.1.13.1 next-hop-self
> neighbor 155.1.23.2 remote-as 65002
> no auto-summary
> !
>
> any help is welcome I'm tired
>
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