Flapping Link in OSPF

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I have 4 routers in media-shared topology (R1,R2,R3,R4).
I use OSPFv2 protocol (IPv4)

"04:59:40: %OSPF-5 ADJCHG: Process 1, Nbr 10.2.0.1 on Fa0/1 FROM EXHANGE to FULL, Exchange Done"
is repeated in R1,R2,R3.

I use Packet Tracer 5, and when I use the timers throttle spf spf-start spf-hold spf-max-wait command (R4(config-router)# timers throttle spf 5 20000 20000)**, OSI finds an error ( Invalid input detected at '^' marker.) in "timers".


I have 2 queries:

1. Does Packet Tracer support that command and if it supports it, what is the mistake?

2. Do I need to apply this command on every router?

** I used this command on every router with the same results.

Thank you.

 

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jovanis,

Can you describe the physical topology between R1, R2, R3, and R4?

 

I don't know if packet tracer supports the command, but you syntax is correct. For the flapping link error, can you give more information? Is it a specific route that is flapping, or an adjacency?

Spice_Weasel

 

jovanis,

Is this a Packet Tracer "Troubleshooting" Activity?

 

No it isn't. I just wanted to work out with different scenarios and i faced that problem. I can give you the original file in order to check what is going on.

However, i am afraid that the routers, i used(1841), dont support the timers throttle spf command, so
I will try the same topology with different routers propably tonight.

Do you have any other idea about that problem?

 

jovanis,

How did you determine that a link is flapping? Which router(s) have what output indicating a flapping link?

 

Sorry for the delay.

R1, R2, R3 display "04:59:40: %OSPF-5 ADJCHG: Process 1, Nbr 10.2.0.1 on Fa0/1 FROM EXHANGE to FULL, Exchange Done" and R4 doesn't "see" any OSPF route in its route table. I consider it as flapping on R4 (plz correct me if I am wrong).

When I disconnect R4 from the network, R1,R2,R3 function perfectly, but when I reconnect it, the problem starts again.

All of the routers are 1841.

I would like to thank you for your support.

 

jovanis,

What is the requirement(s) for two OSPF routers to form an adjacency?