Understanding Cisco Express forwarding

Cisco Express Forwarding (CEF) is advanced, Layer 3 IP switching technology. CEF optimizes network performance and scalability for networks with large and dynamic traffic patterns, such as the Internet, on networks characterized by intensive Web-based applications, or interactive sessions.

[@bisiadeyiga6353]

Been reading a lot of complicated nonsense online for hours but your video just nailed it. Straight to the point and really simple to grasp. Thanks

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[@stylz1]

This whole networking technology engineering thing is like building more simple protocols on top of more primitive and more complex protocols, and at the other end this new technology seems like more complicated stuff. Duality of this is astonishing.

[@cosigi]

Thank you so much!! I reread the same section in my book multiple times but this just cleared it up!!

[@Slavey]

It's very simple and nice explanation, thank you

[@ticossauro]

Congrats! Thanks for sharing! Best regards from Brazil!

[@sam3980]

your explanation is great, simple and concise, but please try to talk more slowly, it'll be much better.. thank you very much for your efforts (y)

[@SIKANDARshaik]

thanks for inputs. i will surely look in to it and ensure that from my next recordings

[@davejr.4711]

Thank you so much! This video was extremely helpful!

[@TuanTran-jn5gs]

Thanks for sharing ! Best regards from Vietnam !

[@ashishwali3436]

Great explanation. It was really helpful. Thanks

[@gbhupenmail]

Good one and very simple way .. Thanks

[@firozsahib]

Thank you sir... Now i understood how cef is working... Thanks lot.

[@gastongasquet3594]

great explanation. Thanks a lot.

[@Hariprasad-rt3fu]

Thank u very much, it was confusing for me after watching this video i got clear idea of cef process

[@RicardoDiaz21129]

Very well explained. Thank you

[@josebarbosa51]

Dude this was an awesome video. Thanks.

[@shaikarshad9670]

it was lovely and clear understanding teaching... thanks.....

[@BonelessEar]

and this is why "debug ip packet" does not show all traffic but only CPU switched one... for CEF traffic is needed "debug ip cef ..."

[@anandsingh2236]

I like the way of expressing topics.

[@justinwalsh5040]

excellent thanks very concise

[@hermanagida6025]

Thanks now i know this and understand much better.

[@madaraekouta8058]

This video is helpfull and very well explained

[@suggriv7926]

Superb sir😍😍😍😍👍🏼👍🏼🔥

[@abhirajput3818]

Its simply Awosmeeee ..

[@AnandNarine]

thank you sir. can you do a video on vrf? your speaking is perfect. i understood everything!

[@derricksmith2002]

Great Video, thanks for putting this together. I thought your English was fine.

[@razore9122]

thnk u it was very helpful

[@saipoojitha5206]

thank u..good explanation

[@afzalkhan9868]

superb.....sir ...
...clearity in explanation.
..
baaki sab confuse karte...

[@keithsmith2272]

Good explanation. Easier to understand comparing to CCNP official book.

[@waseemshahzad4055]

very well explained

[@bijubalan7819]

Great Video. But, I think, we need some clarification on Adjacency table. Because, I believe that Adj: Table is something that used for the Layer 2 information that we need in order to forward the packet and it is not at all related to the Routing table. Like something that maintains layer 2 Next hop address.
Again thank you so much for the upload :)

[@chriscraddock743]

Biju,
Yes the Adjacency table is used for the next hop L2 interface information. After the route lookup is performed in the FIB, the router still needs to encapsulate the L3 packet into a frame and it needs the L2 info to accomplish this. The Adjacency table is build from the ARP table that is constructed by the L3 engine. The Adjacency Table is part of the FIB but not directly related to the L3 RT. If no next hop info exists in the Adj table then the packet is punted to the RP for a "CEF Glean" lookup, which means its asking the Control Plane to perform an ARP to find the L2 info. I HTH.

[@SuraskaSanjaya]

thanks nice explain

[@nitinahuja2472]

great explanation

[@hikgerguy1234]

For those of you saying he's hard to understand or hard to follow, just use the controls on CZcams and slow the speed to .75. I admittedly had trouble understanding him at full speed, but at .75 it was no problem.

[@ram-tv5701]

Settings>Speed>0.75

[@saylimanss2190]

Try the speed of 1.25 ^^

[@PB-og9ec]

THANKS SIR FOR SHARING VERY USEFUL VIDEOS. SIR I REQUEST YOU CAN YOU PLEASE SHARE CCIE R & S INTERVIEW QUESTIONS?

[@motiondesign2501]

thnsk bro

[@Its_me_Abdul]

i am not a native english speaker but i understand his speech very easily, maybe the pronunciation is a bit difficult for you guys to understand.

[@journeyman138]

I would have also addressed Per-Destination vs. Per-Packet.

[@chawnduback9701]

Some great information, but I found it a little hard to follow.

[@globaleducationnetworklear6000]

so cute

[@dinesh-xf8ij]

Nicky explained

[@sudiptoecebhaduri]

cef table has next hop info. adjacency tabe has next hop l2 mac address info by that router can reach next hop.
explaining cef overview is unclear.

[@delnomad]

Ahmed Ahmed Ahmed Ahmed Mohamed

[@tamoorali9065]

must be slow

[@arthurwatts1680]

Even after changing the playback speed to 0.75, you sound like you're hurrying through this. Complex topics, and networking is definitely in that group, require less speed not more. There is absolutely nothing wrong with your English and you clearly know your stuff, but your delivery lets everything down.

[@cabecitavides]

Obviously, you know what you are talking about .... However, i stop listen to it because you are talking too fast, and some words are hard to understand. Hopefully, you can re-record it in a much slower pace.
Cheers

[@moondoggspicoli1583]

I agree with most of the other comments... VERY hard to understand your speech AND also read your writing... You obviously know what you're talking about, but if you can't communicate effectively then what's the point?

[@marcooconnor]

Found it easy, and I am Scottish

[@evermore7212]

I'm able to understand about half of what you're saying. You seem to know your stuff but you really need to work on that accent.

[@jjenko6366]

Your ignorance is unreal. Learn another language and speak it without accent. This guy was amazing in his explanation. only simple minded folk get caught in something as simple as an accent. Thanks to the tutor, I learned a great deal.

[@bisiadeyiga6353]

Cant believe there are still people like you. That he can speak your language but you dont understand his language and dont appreciate his accent tells how inteligent the guy is and how lazy you. He's made the effort to learn english; if you are not lazy, you'll make the effort to understand him. No wonder, you could only understand ABOUT half of what he said.

[@sergiofaik78]

you should've just do a txt interaction instead of talking... I gave up halfway, take it constructively

[@mu1990adse]

learn how to speak English before teaching, take it step by step... PLEASE

[@madaraekouta8058]

Idiot