From: Richard Y. Zheng (richardzheng@xxxxxxxxx)
Date: Sun Apr 01 2001 - 12:51:32 GMT-3
Hi,
I have a question about OSPF to BGP redistribution. For example, router ra,
rb and rc run OSPF and IBGP. Rb is a router reflector and BGP neighbor with
Ra and Rc. Ra and Rb have redistribute OSPF to BGP. I didn't put "no sync" in
any router. I expect to see BGP table synchronized because those routes are
learnd from OSPF and all routers know them. Ra and Rb have their BGP table
synchrozined. However unless I put a "no sync" in rc, its table won't sync.
Can someone explain why?
If you have ccbootcamp 8, that's the problem I have in R2 which is Rc in this
case. I attached the config, IP routing table and BGP table, if that helps...
Thanks,
> r2-b#sh ip bgp 172.168.80.0
> BGP routing table entry for 172.168.80.0/24, version 0
> Paths: (1 available, no best path)
> Not advertised to any peer
> 1, (received & used)
> 137.20.68.2 (metric 20) from 200.200.200.1 (137.20.60.1)
> Origin IGP, metric 0, localpref 100, valid, internal, not
> synchronized,
> re
> f 2
> Originator: 137.20.60.1, Cluster list: 200.200.200.1
> r2-b#sh ip bgp 172.168.70.0
> BGP routing table entry for 172.168.70.0/24, version 5
> Paths: (1 available, best #1)
> Not advertised to any peer
> 3, (received & used)
> 137.20.17.2 (metric 20) from 200.200.200.1 (200.200.200.1)
> Origin IGP, metric 170, localpref 100, valid, internal, synchronized,
> best
> , ref 2
> r2-b#
>
> r2-b#r
> Building configuration...
>
> Current configuration:
> !
> ! Last configuration change at 10:08:44 EST Mon Mar 1 1993
> !
> version 12.0
> service timestamps debug uptime
> service timestamps log uptime
> no service password-encryption
> !
> hostname r2-b
> !
> logging buffered 5000 debugging
> !
> ip subnet-zero
> no ip domain-lookup
> ipx routing 0002.0002.0002
> !
> !
> !
> clock timezone EST -4
> clock summer-time EDT recurring
> !
> !
> !
> !
> interface Loopback0
> ip address 137.20.22.1 255.255.255.0
> no ip directed-broadcast
> ip ospf interface-retry 0
> !
> interface Ethernet0/0
> ip address 137.20.20.1 255.255.255.0
> no ip directed-broadcast
> ip ospf cost 1
> ip ospf interface-retry 0
> ipx network 200
> ipx output-gns-filter 1001
> !
> interface Serial0/0
> ip address 137.20.235.2 255.255.255.224
> no ip directed-broadcast
> encapsulation frame-relay
> ip ospf network point-to-multipoint
> ip ospf interface-retry 0
> no ip mroute-cache
> keepalive 15
> ipx access-group 800 in
> ipx network 5130
> no fair-queue
> frame-relay map ip 137.20.235.1 125 broadcast
> frame-relay map ipx 5130.0003.0003.0003 125 broadcast
> frame-relay map ip 137.20.235.3 125 broadcast
> frame-relay map ipx 5130.0005.0005.0005 125 broadcast
> no frame-relay inverse-arp
> !
> interface Ethernet0/1
> no ip address
> no ip directed-broadcast
> shutdown
> !
> interface Serial0/1
> no ip address
> no ip directed-broadcast
> shutdown
> !
> router ospf 1
> area 1 virtual-link 137.20.235.1
> network 137.20.20.0 0.0.0.255 area 3
> network 137.20.22.0 0.0.0.255 area 1
> network 137.20.235.0 0.0.0.31 area 1
> default-information originate always
> !
> router bgp 2
> neighbor 200.200.200.1 remote-as 2
> neighbor 200.200.200.1 update-source Loopback0
> neighbor 200.200.200.1 soft-reconfiguration inbound
> !
> ip classless
> !
> access-list 800 deny 700 200
> access-list 800 permit FFFFFFFF
> access-list 1001 deny FFFFFFFF 4
> access-list 1001 permit FFFFFFFF
> !
> !
> !
> ipx router eigrp 1
> network 5130
> !
> !
> ipx router rip
> no network 5130
> !
> !
> !
> alias exec c conf t
> alias exec ip show ip route
> alias exec ipx show ipx route
> alias exec bgp show ip bgp
> alias exec i show run int
> alias exec b show ip int brief
> alias exec o show ip ospf
> alias exec ci clear ip route *
> alias exec r show run
> alias exec cb clear ip bgp *
> alias exec cbs clear ip bgp * soft
> alias exec cp clear ipx route *
> !
> line con 0
> exec-timeout 0 0
> password cisco
> login
> transport input none
> line aux 0
> exec-timeout 0 0
> password cisco
> login
> line vty 0 4
> exec-timeout 0 0
> password cisco
> login
> !
> ntp master 4
> no scheduler allocate
> end
>
> r2-b#bgp
> BGP table version is 17, local router ID is 137.20.22.1
> 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
> * i137.20.15.0/24 200.200.200.1 0 100 0 ?
> *>i137.20.17.0/24 137.20.144.1 20 100 0 ?
> *>i137.20.20.0/24 137.20.15.2 50 100 0 ?
> * i137.20.30.0/24 137.20.15.2 50 100 0 ?
> * i137.20.33.1/32 137.20.15.2 50 100 0 ?
> * i137.20.60.1/32 137.20.15.2 1564 100 0 ?
> * i137.20.68.0/24 137.20.15.2 20 100 0 ?
> * i137.20.128.0/20 137.20.15.2 11 100 0 ?
> * i137.20.235.1/32 137.20.15.2 1 100 0 ?
> * i137.20.235.3/32 137.20.15.2 49 100 0 ?
> *>i160.0.0.0/4 200.200.200.1 100 0 i
> *>i172.168.70.0/24 137.20.17.2 170 100 0 3 i
> * i172.168.80.0/24 137.20.68.2 0 100 0 1 i
> * i200.200.200.0 200.200.200.1 0 100 0 ?
> r2-b#ip
> 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, * - candidate
> default
> U - per-user static route, o - ODR
>
> Gateway of last resort is not set
>
> 170.10.0.0/24 is subnetted, 1 subnets
> O E2 170.10.10.0 [110/1] via 137.20.235.1, 02:55:18, Serial0/0
> 200.200.200.0/32 is subnetted, 1 subnets
> O IA 200.200.200.1 [110/75] via 137.20.235.1, 02:55:18, Serial0/0
> 137.20.0.0/16 is variably subnetted, 14 subnets, 5 masks
> O 137.20.144.0/20 [110/1626] via 137.20.235.1, 02:55:28, Serial0/0
> O 137.20.128.0/20 [110/74] via 137.20.235.1, 02:55:28, Serial0/0
> O 137.20.235.3/32 [110/112] via 137.20.235.1, 15:06:16, Serial0/0
> C 137.20.235.0/27 is directly connected, Serial0/0
> O 137.20.235.1/32 [110/64] via 137.20.235.1, 15:06:17, Serial0/0
> O IA 137.20.30.0/24 [110/113] via 137.20.235.1, 02:55:18, Serial0/0
> C 137.20.20.0/24 is directly connected, Ethernet0/0
> C 137.20.22.0/24 is directly connected, Loopback0
> O E2 137.20.17.0/24 [110/20] via 137.20.235.1, 02:55:18, Serial0/0
> O IA 137.20.15.0/24 [110/74] via 137.20.235.1, 02:55:19, Serial0/0
> O 137.20.60.1/32 [110/1627] via 137.20.235.1, 02:55:29, Serial0/0
> O E1 137.20.44.0/28 [110/164] via 137.20.235.1, 02:55:19, Serial0/0
> O 137.20.33.1/32 [110/113] via 137.20.235.1, 15:06:18, Serial0/0
> O E2 137.20.68.0/24 [110/20] via 137.20.235.1, 02:55:19, Serial0/0
> 172.168.0.0/24 is subnetted, 2 subnets
> O E2 172.168.70.0 [110/1] via 137.20.235.1, 02:55:19, Serial0/0
> O E2 172.168.80.0 [110/1] via 137.20.235.1, 02:55:20, Serial0/0
> 160.10.0.0/24 is subnetted, 1 subnets
> O E2 160.10.10.0 [110/1] via 137.20.235.1, 02:55:20, Serial0/0
> 161.10.0.0/24 is subnetted, 1 subnets
> O E2 161.10.10.0 [110/1] via 137.20.235.1, 02:55:20, Serial0/0
> O E2 160.0.0.0/4 [110/1] via 137.20.235.1, 02:55:20, Serial0/0
> r2-b#
> r2-b#sh ip bgp 137.20.68.0
> BGP routing table entry for 137.20.68.0/24, version 0
> Paths: (1 available, no best path)
> Not advertised to any peer
> Local, (received & used)
> 137.20.15.2 (metric 74) from 200.200.200.1 (200.200.200.1)
> Origin incomplete, metric 20, localpref 100, valid, internal, not
> synchron
> ized, ref 2
> r2-b#sh ip bgp 137.20.15.0
> BGP routing table entry for 137.20.15.0/24, version 0
> Paths: (1 available, no best path)
> Not advertised to any peer
> Local, (received & used)
> 200.200.200.1 (metric 75) from 200.200.200.1 (200.200.200.1)
> Origin incomplete, metric 0, localpref 100, valid, internal, not
> synchroni
> zed, ref 2
> r2-b#sh ip route 137.20.68.0
> Routing entry for 137.20.68.0/24
> Known via "ospf 1", distance 110, metric 20, type extern 2, forward
> metric
> 162
> 6
> Redistributing via ospf 1
> Last update from 137.20.235.1 on Serial0/0, 02:56:54 ago
> Routing Descriptor Blocks:
> * 137.20.235.1, from 137.20.60.1, 02:56:54 ago, via Serial0/0
> Route metric is 20, traffic share count is 1
>
> r2-b#sh ip route 137.20.15.0
> Routing entry for 137.20.15.0/24
> Known via "ospf 1", distance 110, metric 74, type inter area
> Redistributing via ospf 1
> Last update from 137.20.235.1 on Serial0/0, 02:56:58 ago
> Routing Descriptor Blocks:
> * 137.20.235.1, from 137.20.235.1, 02:56:58 ago, via Serial0/0
> Route metric is 74, traffic share count is 1
>
> r2-b#
>
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