when i try to add this topology in latest GNS3 it won't load and give error 203 bad number of parameter pls fix it for all labs
OSPF Virtual Link and Summarization
Scenario:
The Company you are currently working for has recently bought a smaller organization and now needs to connect the 2 networks together. Company policy specifies that only OSPF can be used as a routing protocol and it's physically impossible to connect the Louie router to the Huey router. Up to you to find a good solution...!
Goal:
- All IP addresses have been preconfigured for you.
- Configure OSPF on all routers, configure the areas as specified in the topology picture.
- Area 2 has no direct connection to Area 0, solve this by using OSPF commands.
- Ensure you have full reachability.
- Create some extra loopbacks on router Louie and advertise them in area 2:
Loopback0: 172.16.0.1 /24
Loopback1: 172.16.1.1 /24
Loopback2: 172.16.2.1 /24
Loopback3: 172.16.3.1 /24 - Make sure router Huey only sees 172.16.0.0/22 in it's routing table, you are only allowed to make changes to router Dewey.
IOS:
c3640-jk9s-mz.124-16.bin
Topology:
Video Solution:
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Comments (11)
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ReneMolenaar 2011-03-14 15:29:39Hi Praveen,
Did you see our forum? Some other people had trouble with this. Did you fix it?
Rene
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router_rugby 2011-05-14 18:35:10Richard Bowman
I had the same problem when I used the uncompressed ios.image file. I switched to the compressed ios.bin file and it loaded fine. Troubleshooting is all great fun.
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lp5 2011-06-07 21:32:24I just spent 1 hour trying to configure the summerization NOT from router dewey !! i thought the question said NOT allowed , but it was totally worth it
try it
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ReneMolenaar 2011-06-07 23:13:56
hehe well at least you learned a valuable lesson there! ;D
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Kaage 2011-06-21 09:57:04Hi, if you want more challenge configure MD5 authentication for Virtual link in addition. Not big task but good to know.
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adosztal 2011-10-23 23:38:31The virtual link addresses are different in the video and in the final configs. In the video it's between 1.1.1.1 and 192.168.12.2, in the final configs it's between 1.1.1.1 and 192.168.23.2.
I "passed" this lab using the second solution (I didn't peak, I swear
), then I changed the virtual links when I verified my work by watching the video, and received this error:Quote:&#xOS;PF-4-ERRRCV: Received invalid packet: mismatch area ID, from backbone area must be virtual-link but not found from 192.168.12.2, FastEthernet0/0
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ReneMolenaar 2011-10-24 15:31:18
Hello Andras,
It depends on the router ID of your OSPF router. OSPF will create a router ID by looking at the highest IP address on a loopback interface. If you don't have a loopback interface it will use the highest IP address on an active interface. Router ID is not preemptive which means it will keep the same router ID unless you reset the OSPF process.
If you configure a Virtual Link you need to configure it between the OSPF ROUTER ID. Not the IP addresses on the interface. That's why it might be different for my or your config. I think I uploaded the final configuration at another day then recording the video which is why the router ID might be different.
Good luck!
Rene
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Sodki 2011-11-07 21:53:24I tried to advertise those loopback addresses via the redistribute connected subnets command in router Louise but for some reason router Huey will not receive the summarized /22 network. You need to specifically advertize the loopbacks via the network command for the summarization to work!! Interesting
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Imortel 2011-11-30 11:05:21Dewey will only generate a summary(the /22) if there is at least one of the subordinate routes in the routing table.
It should not matter in any way what you did on Louie. You just need to advertise those loopbacks in area 2 and do the sumarization on Dewey then.
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ReneMolenaar 2011-12-09 21:09:05
OSPF can be fun to play with
Keep in mind what Alexandru said, you need at least one route in your routing table in order for OSPF to advertise the summary. This applies to all routing protocols.