OSPF Process

[vishalpatil86]

Dear All,

What is the significance of ospf process in ospf routing?                  

[Subeh Sharma]

Hi Vishal,

Can you elaborate more on what you're asking?

Thanks,

Subeh

[vishalpatil86]

what if we use different process IDs for ospf routing?

suppose we have two rputes to advertise, 10.3.3.0/24 and 192.168.13.0/24.

for the first route we use process 1 and for second route, process 2

r1(config)#router ospf process 1

r1(config-ospf)#network 10.3.3.0 0.0.0.255 are 1

r1(config)#router ospf process 2

r1(config-ospf)#network 192.168.13.0 0.0.0.255 are 1

does this make any difference if take two different process IDs?

[Rolf Fischer]

Hi,

an OSPF interface can only apply to one of the processes and without a redistribution between the 2 processes the neighbor router will only learn about the links of that single process.

Hope that helps

Rolf

[Subeh Sharma]

Vishal,

You can run multiple processes on a router for OSPF but if you expect running one process on the neighbor and learning the routes from both the processes, then that will not happen. One OSPF process can learn routes from only one OSPF process.

Regards,

Subeh

[vishalpatil86]

ok.

you mean if i configure two process IDs on one router and 1 process ID on the other, they won't communicate?

[Subeh Sharma]

Vishal,

What i mean is that the remote router with one OSPF instance will be forming neighborship with only one of the OSPF process of your router.

Regards,

Subeh

[paul driver]

Hello

Not unless you redistribute between the two

Process ids are locally significant

res

Paul

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Thanks.

[paul driver]

Hello again!

Please see this CSC post

https://learningnetwork.cisco.com/thread/6248

res

Paul

Please don't forget to rate any posts that have been helpful.

Thanks.