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Rahul Chauhan
Beginner

Help in Understanding of cisco express forwarding

Hi greetings, I am having trouble in understanding the FIB table. Please help me out on this. Below is the image of that table. Thanks

1 ACCEPTED SOLUTION

Accepted Solutions
Spooster IT Services
Rising star

Hi Rahul,

 

CEF uses a FIB to make IP destination prefix-based switching decisions. The FIB is conceptually similar to a routing table or information base. It maintains a mirror image of the forwarding information contained in the IP routing table.

drop means that any packet that match the destination ip address or subnet in that entry will be dropped.
receive means that any packet that match the destination ip address or subnet in that entry will be forwarded to the CPU for processing.
attached means simply that the ip address or subnet in that entry is locally connected.

Sr Network Engineer
Freelancer

View solution in original post

3 REPLIES 3
Peter Paluch
Hall of Fame Cisco Employee

Hello Rahul,

What is it exactly you would like to ask about? The FIB table shown in your snapshot is a classic one from a multilayer switch - nothing unexpected there. Is there anything specific you are looking at?

Best regards,
Peter

Hi Peter,

I would like to know what it is, what does it represents every detail about that snapshot like which IP is droping and received and attached and interface what does all this means, in short understanding FIB table. Help me on this.

 

thanks

Spooster IT Services
Rising star

Hi Rahul,

 

CEF uses a FIB to make IP destination prefix-based switching decisions. The FIB is conceptually similar to a routing table or information base. It maintains a mirror image of the forwarding information contained in the IP routing table.

drop means that any packet that match the destination ip address or subnet in that entry will be dropped.
receive means that any packet that match the destination ip address or subnet in that entry will be forwarded to the CPU for processing.
attached means simply that the ip address or subnet in that entry is locally connected.

Sr Network Engineer
Freelancer

View solution in original post