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OSPF problem
http://forum.gns3.net/topic2764.html
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Author:  kashifb [ Tue Nov 09, 2010 3:37 pm ]
Post subject:  OSPF problem

i have three router R1, R2 and R3

after applying ospf

R1 is enable to ping R3 ethernet port and R3 is also enable to ping R1 is ethernet port but serial port ping each other

my subnet is 255.255.224.0

R1:

network 172.16.0.0 0.0.31.255 area 0

network 192.168.1.0 0.0.0.255 area 0

R2:

network 172.16.0.0 0.0.31.255 area 0

nework 192.168.2.0 0.0.0.255 area 0

network 172.16.64.0 0.0.31.255 area 0

R3:

network 172.16.32.0 0.0.31.255 area 0

Author:  ykzdady [ Tue Nov 16, 2010 5:47 pm ]
Post subject:  Re: OSPF problem

Do you mind posting your topology? im kind of confusing

Author:  rednectar [ Tue Nov 16, 2010 9:31 pm ]
Post subject:  Re: OSPF problem

On each router:

Code:
show ip interface brief
show ip protocols


Step 1: If any interface is not showing Up Up in the show ip interface brief, fix it.

Step 2: Now compare every interface you see in the show ip interface brief with the output of show ip protocols
If every interface shown in the output of show ip protocols is NOT covered in the output of show ip protocols then fix it.

Step 3: Check you have the same subnet mask at each end of each interconnecting link, and of course that each end of each interconnecting link IS indeed on the same subnet AND area.

If you have made significant changes to the OSPF configuration, issue a clear ip ospf process

Cover those 3 and you will solve 99% of OSPF configuration problems.

Author:  iandart [ Tue Nov 23, 2010 10:49 am ]
Post subject:  Re: OSPF problem

Without a topology diagram, this is quite difficult.

I can see R1 and R2 are connected via the 172.16.0.0 network.

I cannot see a common network between R2 and R3, or R1 and R3.

Author:  vanikad [ Sat Jul 23, 2011 7:42 pm ]
Post subject:  Re: OSPF problem

It's difficult to understand without the topology,
try to check on each routers routing tables and to see if there are routes to networks atached to those interfaces that you cannot ping.

Check this link getnetworking.net, there is a video ospf configuration tutorial, maybe will help you.

Good Luck!

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