OSPF network command

From: Hunt Lee (ciscoforme3@xxxxxxxxxxxx)
Date: Sun Jul 14 2002 - 11:37:35 GMT-3

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150.150.150.0/24---RTA ---RTB ---RTD---RTF
                           | |
                          RTC RTE

RTA - RTB : OSPF Process 3, OSPF Area 3
RTB - RTC : OSPF Process 1, OSPF Area 1
RTB - RTD : OSPF Process 5, OSPF Area 0
RTD - RTE : OSPF Process 2, OSPF Area 2

RTB's interface: - 172.16.0.17 (connecting to RTD)
RTD's interface: - 172.16.0.18 (connecting back to RTB)

My question is this:

I have an OSPF neighbor relationship between RTB to all three RTA,
RTC, & RTD, and RTD also has an OSPF neighbor relationship with RTE.
But on RTE, I just can't see the interfaces between RTB & RTD
(172.16.0.17 & 172.16.0.18) via OSPF.

RouterE>sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B -
BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

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

Gateway of last resort is not set

     150.150.0.0 255.255.255.0 is subnetted, 1 subnets
O E2 150.150.150.0 [110/11] via 172.16.0.14, 00:17:22, Serial0
     172.16.0.0 255.255.255.252 is subnetted, 2 subnets
C 172.16.0.12 is directly connected, Serial0
O E2 172.16.0.0 [110/64] via 172.16.0.14, 00:17:31, Serial0
     193.16.0.0 255.255.255.252 is subnetted, 2 subnets
O E2 193.16.0.0 [110/10] via 172.16.0.14, 00:17:31, Serial0
O E2 193.16.0.8 [110/20] via 172.16.0.14, 00:17:58, Serial0
RouterE>

RouterE>sh ip ospf database

OSPF Router with ID (172.16.0.13) (Process ID 2)

Router Link States (Area 2)

Link ID ADV Router Age Seq# Checksum Link count
172.16.0.13 172.16.0.13 1120 0x80000006 0xD2FA 2
172.16.0.18 172.16.0.18 1121 0x80000002 0x8A1F 2

AS External Link States

Link ID ADV Router Age Seq# Checksum Tag
150.150.150.0 172.16.0.18 1076 0x80000001 0x61B5 0
172.16.0.0 172.16.0.18 1084 0x80000001 0xBE0 0
193.16.0.0 172.16.0.18 1084 0x80000001 0xDA32 0
193.16.0.8 172.16.0.18 1140 0x80000001 0xEE0C 0
RouterE>

But the config seems fine to me on RTB & RTD:-

At RTB:-

router ospf 5
log-adjacency-changes
redistribute ospf 1 subnets
redistribute ospf 3 subnets
network 172.16.0.16 0.0.0.3 area 0

RouterB#sh ip ospf n

Neighbor ID Pri State Dead Time Address Interface
150.150.150.1 1 FULL/DR 00:00:36 193.16.0.2 Ethernet0
172.16.0.2 1 FULL/ - 00:00:31 172.16.0.2 Serial0
193.16.0.9 1 FULL/ - 00:00:31 172.16.0.18 Serial1

RouterB#sh ip route
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

     172.16.0.0/30 is subnetted, 3 subnets
C 172.16.0.16 is directly connected, Serial1
O E2 172.16.0.12 [110/64] via 172.16.0.18, 00:19:57, Serial1
C 172.16.0.0 is directly connected, Serial0
     193.16.0.0/30 is subnetted, 2 subnets
C 193.16.0.0 is directly connected, Ethernet0
B 193.16.0.8 [200/0] via 172.16.0.18, 00:19:47
     150.150.0.0/24 is subnetted, 1 subnets
O 150.150.150.0 [110/11] via 193.16.0.2, 00:19:57, Ethernet0
RouterB#

At RTD:-

router ospf 5
redistribute ospf 2 subnets
network 172.16.0.16 0.0.0.3 area 0

RouterD#sh ip ospf n

Neighbor ID Pri State Dead Time Address Interface
172.16.0.13 1 FULL/ - 00:00:34 172.16.0.13 Serial0
193.16.0.1 1 FULL/ - 00:00:37 172.16.0.17 Serial1

RouterD#sh ip route
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

     172.16.0.0/30 is subnetted, 3 subnets
C 172.16.0.16 is directly connected, Serial1
C 172.16.0.12 is directly connected, Serial0
O E2 172.16.0.0 [110/64] via 172.16.0.17, 00:21:57, Serial1
     193.16.0.0/30 is subnetted, 2 subnets
O E2 193.16.0.0 [110/10] via 172.16.0.17, 00:21:57, Serial1
C 193.16.0.8 is directly connected, Ethernet0
     150.150.0.0/24 is subnetted, 1 subnets
O E2 150.150.150.0 [110/11] via 172.16.0.17, 00:21:49, Serial1
RouterD#

I thought by using "network 172.16.0.16 0.0.0.3 area 0" on both RTB &
RTD, it should include that in OSPF, and it would progagated the
subnet to other OSPF routers. I just couldn't understand.. am I
missing something simple here?

Also, when I checked the OSPF database on RTB & RTD, the 2 interfaces
are not even showing up under Router Link States (Area 0)...

RouterB#sh ip ospf database

OSPF Router with ID (172.16.0.1) (Process ID 3)

Router Link States (Area 3)

Link ID ADV Router Age Seq# Checksum Link
count
150.150.150.1 150.150.150.1 1505 0x80000002 0x1B08 2
172.16.0.1 172.16.0.1 1505 0x80000002 0x6D97 1

Net Link States (Area 3)

Link ID ADV Router Age Seq# Checksum
193.16.0.2 150.150.150.1 1506 0x80000001 0x2002