[OSPF] Not working Properly

[jeremydaix]

Hello everyone,

i'm trying to make 3 router communicate with OSPF and i don't understand why one of my router (RN) isn't update properly and doesn't have all the network i want him to have (network 192.168.11.0 / 192.168.12.0 / 192.168.21.0 / 192.168.22.0)

 I want to be able to ping from any lan the server and the laptop

Here is my code for the router :

• routerFR

router ospf 1
        network 172.16.123.0 0.0.0.7 area 123  
        network 172.16.102.0 0.0.0.3 area 123  
        network 192.168.11.0 0.0.0.255 area 123
        network 192.168.12.0 0.0.0.255 area 123

• RouterNL

router ospf 1
        network 172.16.123.0 0.0.0.7 area 123  
        network 172.16.102.0 0.0.0.3 area 123  
        network 192.168.21.0 0.0.0.255 area 123
        network 192.168.22.0 0.0.0.255 area 123

• Router Neutre (RN)

router ospf 1
      network 192.168.31.0 0.0.0.255 area 123
      network 172.16.123.0 0.0.0.7 area 123

I join my packetTracer File

Thank you

[Giuseppe Larosa]

Hello @jeremydaix ,

if you can provide a network diagram it would be an aid not everyone runs packet tracer.

the three routers share a common IP subnet is this a LAN or you are using serial interfaces in NBMA?

Because OSPF is easy and immediate on LAN segments it is not so easy on serial interfaces with Frame Relay encapsulation.

Hope to help

Giuseppe

[jeremydaix]

Thank you for the reply.

Here is a capture of the network diagram from pkt.

I'm indeed using serial interface but i don't know if it's a NBMA (it's the first time that i heard that word)

[Georg Pauwen]

Hello,

not sure if this has already been answered, but if you remove RIP from both routers, the FR router will get all the OSPF routes. Packet Tracer can be a bit quirky, so I am not sure that this is normal behavior, as usually, OSPF has a lower administrative distance (110) than RIP (120).

[jeremydaix · Accepted solution]

i can't run rip and ospf together? I thought ospf had priority over rip
My problem is that RN isn't update by the FR router and so the Fr Lan can't access to the server and i don't understand why it's like that while the RN server has the update from the NL router that has rip too

I found the mistake. I configured 2 sub-interface on each router (fr and nl) that was the same (g0/0.99) and when ospf update RN i had

00:00:45: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.99.254 on GigabitEthernet0/1 from LOADING to FULL, Loading Done

for each router

And now that i disable that interface it works perfectly

Thank you everyone for your help