How to process OSPF in FW?

[KiCheon.Lee]

Hello,

I heard from someone in the past that control plane send ospf hello packet and data plane has routing table.

Is it correct??

OSPF issue occurred in my custom site. So I wonder it.

And what is the different between routing table and FIB?

Thanks.

[cchristiansen · Accepted solution]

Hello cheon.

The hello packets are generated on the management plane and sent out the data plane. The routing table is managed by the mangment plane, and "frequently used, or best match" routes are sent to the FIB.

The FIB(forwarding information base) is a software copy of the routes which are programmed to the TCAM for packet forwarding.  This is a simple explanation, but I hope it answers your questions.

-chadd.

[KiCheon.Lee]

Thank you very much, chadd.

I got very helpful from you answer.

[stewart]

Hi cheon,

What was the issue you had? We have run into OSPF issues that have a lower than default hello interval. Like 2 seconds.

[KiCheon.Lee]

Hi stewart,

I had ospf issue that failed ospf hello negotiation with neighbor L3 device when FW was attacked ddos.