OSPF / PacketTracer issue

Radiant9

Hello all.

I'm having an issue with an OSPF lab I'm doing in Packet Tracer 5.3 and I'm hoping some of you can help. The simple question is I have 12 routers in my network. 1 of these routers is not updating it's ospf routing table. I added a default route to the next router and now my network is fully pingable, but this one router wont update. Any ideas?

More detailed: I have designed my own network to play with and learn on. The basic design is as follows (to download my saved packet tracer 5.3 lab from dropbox go to Dropbox - 6CityNet.pkt - Simplify your life ):

Simulated company network spanning 6 cities. San Fran, Chicago, NY, Atlanta, Denver and LA. They connect in a ring topology via serial (SF connects to Chi and LA. Chi connects to NY and SF. NY connects to Atl and Chi. Atl = Den + NY. Den = LA + Atl. LA = SF + Den. Alright, still with me? OK. These routers are the core. Each city's core router connects to another router (each city's office if you will)which connects to the city's LAN. The core 6 routers and the network between the core routers and the office routers are all in OSPF Area 0. The networks in each city office's LAN represent separate OSPF Areas. The router giving me fits is the "office" router in San Fran. It's routing table is only the directly connected networks. It can ping the SF Core router because its directly connected, but couldn't hit any other routers until I added a gateway of last resort going to the SF core router (which has a full routing table).

Any help is MUCH appreciated. Like I said, using that gateway of LR, I was able to incorporate a work-around but I'd like to learn WHY it's not functioning properly and HOW to fix it.

Thanks in advance. And sorry if my description makes little sense. Hard to know what's too much info and what's not enough. And if you have packet tracer and are interested, please feel free to download my save file.

Radiant9

Sorry all. Put the wrong link for the file in last post. here is the correct link. File is 31KB

http://dl.dropbox.com/u/20614848/6CityNet.pkt
or
HyperLink

martell1000

so the router gving you issues is the SF-Int device?

I you provide the router password i will take a look at the config.

Radiant9

Sorry, forgot.

All passwords are simply "cisco".

and yes, SF-Int is the router not updating.

Radiant9

While you guys are in there, please don't hesitate to offer any/all observations and critiques. My skin is not thin and my desire to FULLY understand all of this is unquenchable.

And, of course, thank you very much for any time you are willing to put into this.

martell1000

i did some testing but i cant see any problems with ospf updates.

i took the core router atlanta down

O IA 10.3.20.0 [110/131] via 192.168.1.1, 00:08:50, FastEthernet0/0
O IA 10.5.1.0 [110/131] via 192.168.1.1, 00:08:50, FastEthernet0/0
O IA 10.5.10.0 [110/131] via 192.168.1.1, 00:08:50, FastEthernet0/0


as you can see the whole 10.4 network is gone so ospf updated the routing table

to verify i switched the router back on

O IA 10.3.20.0 [110/131] via 192.168.1.1, 00:09:11, FastEthernet0/0
O IA 10.4.1.0 [110/195] via 192.168.1.1, 00:00:14, FastEthernet0/0
O IA 10.4.10.0 [110/195] via 192.168.1.1, 00:00:14, FastEthernet0/0
O IA 10.4.20.0 [110/195] via 192.168.1.1, 00:00:14, FastEthernet0/0
O IA 10.5.1.0 [110/131] via 192.168.1.1, 00:09:11, FastEthernet0/0

and back it is

did a traceroute to a PC on the other end of the network from the SF router also:

SF-Int#traceroute 10.4.20.1
Type escape sequence to abort.
Tracing the route to 10.4.20.1

1 192.168.1.1 4 msec 4 msec 5 msec
2 200.1.1.21 7 msec 6 msec 10 msec
3 200.1.1.6 9 msec 14 msec 10 msec
4 200.1.1.13 12 msec 15 msec 11 msec
5 192.168.1.14 21 msec 24 msec 19 msec


for me ospf seems up and running.

note that in a large network like that updates may take a while in PT to take place...

anyway: nice lab you build there. if you are in the mood and its on your schedule it would be a nice to add some frame relay stuff on the routers with serial connection, some subinterface point to point magic and multipoint configs, but if you decide to do so notice that ospf can be real bitchy over NBMA networks...

alan2308

martell1000 wrote: »

so the router gving you issues is the SF-Int device?

I you provide the router password i will take a look at the config.

A little tip here. Go to the config tab, click on any interface, you don't even need to change anything, and look down at the "Equivalent IOS Commands" box and you're in global config. So if you go back to the CLI tab, you're in, bypassing the password prompt.

Radiant9

Martell,

Are you saying the SF-Int router had a FULL routing table? If so, what version of Packet Tracer are you running? I have had that lab up for hours so time for convergence wasn't the issue.

Also, thx for your time. Glad you like it. I will definitely be doing some WAN labs. I'm a hands-on type. I can study books and videos for hours and retain quite a bit, but using the commands, using the theory, having things fail and figuring out why is how I cement all this information.

martell1000

i dont know if it is full, since there are a lot of networks and i didnt count them all.

just verified that ospf updates are put in the routing table..

since you build that thing and are familiar with the number of networks here is the routing table from the SF-Int router:

10.0.0.0/24 is subnetted, 18 subnets
C 10.1.1.0 is directly connected, FastEthernet0/1.1
C 10.1.10.0 is directly connected, FastEthernet0/1.10
C 10.1.20.0 is directly connected, FastEthernet0/1.20
O IA 10.2.1.0 [110/67] via 192.168.1.1, 00:01:26, FastEthernet0/0
O IA 10.2.10.0 [110/67] via 192.168.1.1, 00:01:26, FastEthernet0/0
O IA 10.2.20.0 [110/67] via 192.168.1.1, 00:01:26, FastEthernet0/0
O IA 10.3.1.0 [110/131] via 192.168.1.1, 00:01:26, FastEthernet0/0
O IA 10.3.10.0 [110/131] via 192.168.1.1, 00:01:26, FastEthernet0/0
O IA 10.3.20.0 [110/131] via 192.168.1.1, 00:01:26, FastEthernet0/0
O IA 10.4.1.0 [110/195] via 192.168.1.1, 00:01:36, FastEthernet0/0
O IA 10.4.10.0 [110/195] via 192.168.1.1, 00:01:36, FastEthernet0/0
O IA 10.4.20.0 [110/195] via 192.168.1.1, 00:01:36, FastEthernet0/0
O IA 10.5.1.0 [110/131] via 192.168.1.1, 00:01:26, FastEthernet0/0
O IA 10.5.10.0 [110/131] via 192.168.1.1, 00:01:26, FastEthernet0/0
O IA 10.5.20.0 [110/131] via 192.168.1.1, 00:01:26, FastEthernet0/0
O IA 10.6.1.0 [110/67] via 192.168.1.1, 00:01:26, FastEthernet0/0
O IA 10.6.10.0 [110/67] via 192.168.1.1, 00:01:26, FastEthernet0/0
O IA 10.6.20.0 [110/67] via 192.168.1.1, 00:01:26, FastEthernet0/0
192.168.1.0/30 is subnetted, 6 subnets
C 192.168.1.0 is directly connected, FastEthernet0/0
O 192.168.1.4 [110/66] via 192.168.1.1, 00:01:36, FastEthernet0/0
O 192.168.1.8 [110/130] via 192.168.1.1, 00:01:36, FastEthernet0/0
O 192.168.1.12 [110/194] via 192.168.1.1, 00:01:36, FastEthernet0/0
O 192.168.1.16 [110/130] via 192.168.1.1, 00:01:36, FastEthernet0/0
O 192.168.1.20 [110/66] via 192.168.1.1, 00:01:36, FastEthernet0/0
200.1.1.0/30 is subnetted, 6 subnets
O 200.1.1.0 [110/65] via 192.168.1.1, 00:01:36, FastEthernet0/0
O 200.1.1.4 [110/129] via 192.168.1.1, 00:01:36, FastEthernet0/0
O 200.1.1.8 [110/193] via 192.168.1.1, 00:01:36, FastEthernet0/0
O 200.1.1.12 [110/193] via 192.168.1.1, 00:01:36, FastEthernet0/0
O 200.1.1.16 [110/129] via 192.168.1.1, 00:01:36, FastEthernet0/0
O 200.1.1.20 [110/65] via 192.168.1.1, 00:01:36, FastEthernet0/0
S* 0.0.0.0/0 [1/0] via 192.168.1.1

i am using PT version 5.3.2

descender421

I got the exact same thing Martell got.