Hi All,
Please have a look in to the below senario
R1 and R2 are directly connected with two links and having IP address 10.0.0.0/24 (ETH 0/0) and 20.0.0.0/24 (ETH 0/1).
R1#sh ip int bri | ex una
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 10.0.0.1 YES manual up up
Ethernet0/1 20.0.0.1 YES manual up up
R2#sh ip int bri | ex una
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 10.0.0.2 YES manual up up
Ethernet0/1 20.0.0.2 YES manual up up
Loopback0 192.168.1.1 YES manual up up
I had enabled OSPF in one link with AREA 0 and another with AREA 1
R1#sh ip ospf int bri
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Et0/0 1 0 10.0.0.1/24 1000 BDR 1/1
Et0/1 1 1 20.0.0.1/24 10 BDR 1/1
2#sh ip ospf int bri
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Et0/0 1 0 10.0.0.2/24 10 DR 1/1
Et0/1 1 1 20.0.0.2/24 10 DR 1/1
Lo0 1 2 192.168.1.1/24 1 LOOP 0/0
additionally i created a loopback in R2 with OSPF Area 2 enabled.I am having that route in the routing table of R1.
R1#sh ip route ospf
Gateway of last resort is not set
192.168.1.0/32 is subnetted, 1 subnets
O IA 192.168.1.1 [110/1001] via 10.0.0.2, 00:15:38, Ethernet0/0
It showing me that the AREA 2 route (192.168.1.1/32) is reachable via AREA 0 interface eventhough the OSPF cost is higher on that interface.
R1#sh run inter eth 0/0
interface Ethernet0/0
ip address 10.0.0.1 255.255.255.0
ip ospf 1 area 0
ip ospf cost 1000
end
R1#sh run inter eth 0/1
interface Ethernet0/1
ip address 20.0.0.1 255.255.255.0
ip ospf 1 area 1
end
R1#sh ip ospf database summary 192.168.1.1
OSPF Router with ID (10.0.0.1) (Process ID 1)
Summary Net Link States (Area 0)
Routing Bit Set on this LSA in topology Base with MTID 0
LS age: 1179
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 192.168.1.1 (summary Network Number)
Advertising Router: 10.0.0.2
LS Seq Number: 80000001
Checksum: 0x665E
Length: 28
Network Mask: /32
MTID: 0 Metric: 1
Summary Net Link States (Area 1)
LS age: 1061
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 192.168.1.1 (summary Network Number)
Advertising Router: 10.0.0.1
LS Seq Number: 80000002
Checksum: 0x9E3A
Length: 28
Network Mask: /32
MTID: 0 Metric: 1001
LS age: 1179
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 192.168.1.1 (summary Network Number)
Advertising Router: 10.0.0.2
LS Seq Number: 80000001
Checksum: 0x665E
Length: 28
Network Mask: /32
MTID: 0 Metric: 1
Why it is not taking the AREA 1 interface even though the cost is higher in AREA0 interface ( I believe we can sent inter-area traffic to non-backbone area because of the capability transit command ).
How can I sent the traffic to a AREA2 from R1 via AREA 1 interface.
Please help.
Thanks,
Arun Mohan