From: Matthew Poole (matthew.poole@blueyonder.co.uk)
Date: Fri Jan 03 2003 - 13:24:20 GMT-3
I cured the problem, thanks to Jack.
There was a combination of two errors.
The main reason it wasn't working was something to do with the router ID on
Vail, I suspect that it was because it wasn't being advertised and telluride
couldn't get to it, so failed the sync rule - must play a little more!
Anybody got any advice?
Also when I retyped the config for the second time I failed to redistribute
BGP into OSPF at Telluride!!
Cheers to everybody who had a look.
Mat.
----- Original Message -----
From: "Matthew Poole" <matthew.poole@blueyonder.co.uk>
To: <ccielab@groupstudy.com>
Sent: Friday, January 03, 2003 2:49 PM
Subject: BGP Sync IBGP over IGP.
> Hi All,
>
> I can't get my head around Doyle vol II case study, IBGP over an IGP
> P174-176.
>
> I have my routers configured as on P175, prior lab worked fine with fully
> meshed IBGP. Once the IGP was introduced it started to fall apart!!
>
> Both Vail and and Telerude can see all routes via OSPF and IBGP, however
no
> best route is selected or advertised - if I turn off synchronisation then
it
> works correctly.
>
> IP addresses as on diagram, I've only included AS100 configs and routes.
>
> I'd appreciate any insight on this!
>
> Thanks,
>
> Mat.
>
> Aspen
>
> router ospf 500
> log-adjacency-changes
> network 192.168.1.0 0.0.0.255 area 0
>
> Show IP route
> Gateway of last resort is not set
>
> O E2 192.168.200.0/24 [110/1] via 192.168.1.221, 00:14:50, Serial0
> O E2 192.168.250.0/24 [110/1] via 192.168.1.221, 00:14:50, Serial0
> 192.168.1.0/30 is subnetted, 7 subnets
> O 192.168.1.224 [110/845] via 192.168.1.221, 00:14:50, Serial0
> O 192.168.1.204 [110/845] via 192.168.1.197, 00:14:50, Serial1
> C 192.168.1.196 is directly connected, Serial1
> O E2 192.168.1.216 [110/1] via 192.168.1.221, 00:14:50, Serial0
> C 192.168.1.220 is directly connected, Serial0
> O 192.168.1.208 [110/845] via 192.168.1.221, 00:14:51, Serial0
> O E2 192.168.1.212 [110/1] via 192.168.1.221, 00:14:51, Serial0
> O E2 192.168.100.0/24 [110/1] via 192.168.1.221, 00:14:51, Serial0
>
> Vail
>
> router ospf 500
> log-adjacency-changes
> redistribute bgp 100 subnets
> network 192.168.1.221 0.0.0.0 area 0
> network 192.168.1.0 0.0.0.255 area 0
> !
> router bgp 100
> bgp router-id 1.1.3.2
> bgp cluster-id 3232301054
> bgp log-neighbor-changes
> neighbor 192.168.1.197 remote-as 100
> neighbor 192.168.1.197 next-hop-self
> neighbor 192.168.1.210 remote-as 300
> neighbor 192.168.1.225 remote-as 200
> neighbor 192.168.1.225 default-originate
> no auto-summary
>
> R4-Vail#sh ip bgp
> BGP table version is 27, local router ID is 1.1.3.2
> Status codes: s suppressed, d damped, h history, * valid, > best, i -
> internal
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric LocPrf Weight Path
> * i192.168.1.200/30 192.168.1.197 80 100 0 400 ?
> *>i192.168.1.204/30 192.168.1.197 80 100 0 400 ?
> *> 192.168.1.208/30 192.168.1.210 50 0 300 ?
> *> 192.168.1.212/30 192.168.1.210 50 0 300 ?
> *> 192.168.1.216/30 192.168.1.225 0 0 200 i
> *> 192.168.1.224/30 192.168.1.225 0 0 200 ?
> * i192.168.50.0 192.168.1.197 80 100 0 400 ?
> * i192.168.75.0 192.168.1.197 80 100 0 400 ?
> *> 192.168.100.0 192.168.1.225 0 0 200 i
> *> 192.168.200.0 192.168.1.225 20 0 200 i
> *> 192.168.250.0 192.168.1.210 50 0 300 ?
>
> R4-Vail#sipr
> Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
> i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
> area
> * - candidate default, U - per-user static route, o - ODR
> P - periodic downloaded static route
>
> Gateway of last resort is not set
>
> B 192.168.200.0/24 [20/20] via 192.168.1.225, 00:32:59
> B 192.168.250.0/24 [20/50] via 192.168.1.210, 00:32:44
> 192.168.255.0/32 is subnetted, 1 subnets
> C 192.168.255.254 is directly connected, Loopback0
> 192.168.1.0/30 is subnetted, 7 subnets
> C 192.168.1.224 is directly connected, Serial1/2
> O 192.168.1.204 [110/1626] via 192.168.1.222, 00:16:11, Serial1/0
> O 192.168.1.196 [110/845] via 192.168.1.222, 00:16:11, Serial1/0
> B 192.168.1.216 [20/0] via 192.168.1.225, 00:33:01
> C 192.168.1.220 is directly connected, Serial1/0
> C 192.168.1.208 is directly connected, Serial1/3
> B 192.168.1.212 [20/50] via 192.168.1.210, 00:32:45
> B 192.168.100.0/24 [20/0] via 192.168.1.225, 00:33:01
>
> Telluride
>
> router ospf 500
> log-adjacency-changes
> network 192.168.1.197 0.0.0.0 area 0
> network 192.168.1.0 0.0.0.255 area 0
> !
> router bgp 100
> bgp log-neighbor-changes
> neighbor 192.168.1.205 remote-as 400
> neighbor 192.168.1.221 remote-as 100
> neighbor 192.168.1.221 next-hop-self
> no auto-summary
>
> R3-Telluride#sh ip bgp
> BGP table version is 5, local router ID is 192.168.1.206
> Status codes: s suppressed, d damped, h history, * valid, > best, i -
> internal
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric LocPrf Weight Path
> *> 192.168.1.200/30 192.168.1.205 80 0 400 ?
> *> 192.168.1.204/30 192.168.1.205 80 0 400 ?
> * i192.168.1.208/30 192.168.1.221 50 100 0 300 ?
> * i192.168.1.212/30 192.168.1.221 50 100 0 300 ?
> * i192.168.1.216/30 192.168.1.221 0 100 0 200 i
> * i192.168.1.224/30 192.168.1.221 0 100 0 200 ?
> *> 192.168.50.0 192.168.1.205 80 0 400 ?
> *> 192.168.75.0 192.168.1.205 80 0 400 ?
> * i192.168.100.0 192.168.1.221 0 100 0 200 i
> * i192.168.200.0 192.168.1.221 20 100 0 200 i
> * i192.168.250.0 192.168.1.221 50 100 0 300 ?
> R3-Telluride#sipr
> Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
> i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
> area
> * - candidate default, U - per-user static route, o - ODR
> P - periodic downloaded static route
>
> Gateway of last resort is not set
>
> B 192.168.75.0/24 [20/80] via 192.168.1.205, 00:24:54
> O E2 192.168.200.0/24 [110/1] via 192.168.1.198, 00:17:20, Serial1/0
> O E2 192.168.250.0/24 [110/1] via 192.168.1.198, 00:17:20, Serial1/0
> B 192.168.50.0/24 [20/80] via 192.168.1.205, 00:24:54
> 192.168.1.0/30 is subnetted, 8 subnets
> O 192.168.1.224 [110/1626] via 192.168.1.198, 00:17:20, Serial1/0
> B 192.168.1.200 [20/80] via 192.168.1.205, 00:24:54
> C 192.168.1.204 is directly connected, Serial1/1
> C 192.168.1.196 is directly connected, Serial1/0
> O E2 192.168.1.216 [110/1] via 192.168.1.198, 00:17:21, Serial1/0
> O 192.168.1.220 [110/845] via 192.168.1.198, 00:17:21, Serial1/0
> O 192.168.1.208 [110/1626] via 192.168.1.198, 00:17:21, Serial1/0
> O E2 192.168.1.212 [110/1] via 192.168.1.198, 00:17:21, Serial1/0
> O E2 192.168.100.0/24 [110/1] via 192.168.1.198, 00:17:23, Serial1/0
> .
.
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