topology:
R4----R1----R2----R3
R4 and R1 under OSPF area 4, R1 and R2 are running area 0, and R3 and R2 in OSPF area 3.
From R1, I can see:
R1#sh ip ospf data
OSPF Router with ID (40.40.40.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
40.40.40.1 40.40.40.1 1499 0x8000000A 0xAFBA 2
172.168.32.1 172.168.32.1 1296 0x80000008 0x74F4 2
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
20.20.20.2 172.168.32.1 1500 0x80000007 0x3959
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
3.3.3.3 172.168.32.1 1255 0x80000001 0x2F80
30.30.30.0 172.168.32.1 458 0x80000004 0x6DF1
40.40.40.0 40.40.40.1 1494 0x80000001 0x2BB7
Router Link States (Area 4)
Link ID ADV Router Age Seq# Checksum Link count
40.40.40.1 40.40.40.1 1498 0x80000002 0x5898 2
40.40.40.4 40.40.40.4 1501 0x80000002 0xACAF 2
Summary Net Link States (Area 4)
Link ID ADV Router Age Seq# Checksum
20.20.20.0 40.40.40.1 1505 0x80000001 0xEB36
but there is not any OSPF route in the routing table:
R1# sh ip ro
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
20.0.0.0/30 is subnetted, 1 subnets
C 20.20.20.0 is directly connected, Serial2
40.0.0.0/24 is subnetted, 1 subnets
C 40.40.40.0 is directly connected, Serial4
R1#
Any reason?
many thanks
