07-22-2013 03:14 PM - edited 03-04-2019 08:31 PM
I created a simple packet tracer topology and connected three ospf areas in the next manner: area0 - area1 - area2 . I verified that area 2 couldn't ping the rest of the network thus I configured a virtual link through area 1. Now area 2 is connected to area 0. My question is why area 1 sees area 2 in its routing table but area 2 cannot see area 1?
Some ip route results:
R0#show ip rout
--- omitted output ---
192.168.0.0/30 is subnetted, 4 subnets
C 192.168.0.0 is directly connected, FastEthernet0/0
O 192.168.0.4 [110/2] via 192.168.0.2, 02:19:32, FastEthernet0/0
[110/2] via 192.168.0.9, 02:19:32, FastEthernet0/1
C 192.168.0.8 is directly connected, FastEthernet0/1
O 192.168.0.12 [110/2] via 192.168.0.9, 01:19:14, FastEthernet0/1
192.168.1.0/30 is subnetted, 4 subnets
O IA 192.168.1.0 [110/3] via 192.168.0.2, 01:11:32, FastEthernet0/0
O IA 192.168.1.4 [110/4] via 192.168.0.2, 01:11:32, FastEthernet0/0
O IA 192.168.1.8 [110/3] via 192.168.0.2, 01:11:32, FastEthernet0/0
O IA 192.168.1.12 [110/2] via 192.168.0.2, 01:11:32, FastEthernet0/0
192.168.2.0/30 is subnetted, 3 subnets
O IA 192.168.2.0 [110/3] via 192.168.0.9, 00:43:58, FastEthernet0/1
O IA 192.168.2.4 [110/4] via 192.168.0.9, 00:43:58, FastEthernet0/1
O IA 192.168.2.8 [110/3] via 192.168.0.9, 00:43:58, FastEthernet0/1
R7#show ip route
--- omitted output ---
192.168.1.0/30 is subnetted, 4 subnets
O IA 192.168.1.0 [110/5] via 192.168.2.1, 00:45:03, FastEthernet0/1
O IA 192.168.1.4 [110/6] via 192.168.2.1, 00:45:03, FastEthernet0/1
O IA 192.168.1.8 [110/5] via 192.168.2.1, 00:45:03, FastEthernet0/1
O IA 192.168.1.12 [110/4] via 192.168.2.1, 00:45:03, FastEthernet0/1
192.168.2.0/30 is subnetted, 3 subnets
C 192.168.2.0 is directly connected, FastEthernet0/1
C 192.168.2.4 is directly connected, FastEthernet0/0
O 192.168.2.8 [110/2] via 192.168.2.1, 02:20:51, FastEthernet0/1
[110/2] via 192.168.2.6, 02:20:51, FastEthernet0/0
Attached there's a print screen of the topology.
07-23-2013 06:22 AM
Hi Daniela,
please, can you upload the .pkt file so we can look at it? Maybe it is some bug, fault of packet tracer.
Best regards,
Jan
07-23-2013 07:50 AM
Areas doesn't have routing table, statement is misleading.
Please tell, are checking on internal routers or ABR ?
Sent from Cisco Technical Support Android App
07-23-2013 09:59 AM
Ashok, I meant the routing tables of the routers within each ospf area. And as you can see in the image I attached R0 and R7 are internal routers, only R1 and R6 are ABR
Jan, there's the .pkt file. I use version 5.3.3 in ubuntu 11.10... I hope that doesn't pose any compatibility issue :s
07-23-2013 10:16 AM
Daniela, internal router just can't have the "O IA" routes i.e. inter-area routes in ospf, you'll see them in ABR/ASBR
either you misconfigured the hostname, i mean, not as per the exact topology; or it just bug with simulator.
also, i couldn't open your .pkt file, coz i'm using in Win7 & you in linux, ubuntu
I suggest you to do this in GNS3, that'll give almost live device experience, CPT is just a simulator, not a cisco IOS.
But, GNS3 emulates original cisco IOS.
reply me with your findings..
07-23-2013 10:17 AM
Hi Daniela,
Thank you for the file, don't worry as I am Ubuntu (12.04) user myself . There should be no issues.
I will take a look on it and let you know as soon as I will finish my other duties.
Bes regards,
Jan
07-23-2013 12:37 PM
I repeated the topology and configuration in GNS3. Now I can see in all routers, regardless the area they belong to, routes to every network in the same area and the other two (those routes that come from different area marked as O IA as expected). So I suppose packet tracer has a bug
Ashok, I didn't misconfigure the hostnames and in the attachments you can see that internal routers do show O IA routes.
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