rib + fib & process switching ,cef


Just question in regard to the rib and fib & process swithching and cef. For example say we have ospf and eigrp on same router nothing else no statics. Does all routes i.e the topology table in eigrp and the link state table in ospf (i.e all routes best and worst of both protocol routes) populate the routers rib table. Then the routers fib table is made up of face off between routes in the ospf forwarding table vs routes eigrp routing table(i.e the best routes in both). With eigrp winning in default config because of the lowest admin distance and populating the fib tbale.  

Then difference between process switching and cef. Is that process switching ques and searches the rib table for the best route taking more time + processing. While cef works of the scaled down fib table speeding up the switching speed of the router??

Can someone confirm this is correct or explain?

BarepAssetsSys AdminAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Otto_NCommented:
The way I see it, the RIB is the combined routing table of both routing protocols (with AD already accounted for), while the FIB table is the specific forwarding table for the specific hardware configuration (containing the MAC rewrite info).

For a comparison between Process switching and CEF, look at http://www.cisco.com/en/US/tech/tk827/tk831/technologies_white_paper09186a00800a62d9.shtml.  It is a bit technical, but should help you with your questions.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Nayyar HH (CCIE RS)Network ArchitectCommented:
Yes, I think I agree with you to an extent.
My understanding of the RIB is that it is seperate from the Routing Table and the RIB contains all *best* routes from individual routing sources. The best routes from the RIB populate the Routing Table with *best* routes. The FIB as you mentioned is a scaled down version of the RT which off-course is the overall best routes from all.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Routers

From novice to tech pro — start learning today.