Introduction to OpenFlow

Great explanation, thanks David

Question - when h1 sent a ARP BROADCAST to ff:ff:ff:ff:ff:ff there was no flow_mod packet. Why is there no flow modification for ARP broadcasts?

Is it possible to modify the timeout and the priority?? If it's yes how to do it??

Great explanation. Thank you very much.

Very useful video for the beginners... thank you.

Thanks for these videos. But can u please explain how to understand the packet flow path followed like h1->S1->S2->h2 in a tree topology without s3 used up to send packets. How to understand the dump-flows result if using controller.java to set switch flows.

I m undergraduate student and new to sdn.
I hav a question
How to do port mirroring functionality in openflow? As you said about group table.Will it be helpful in doing port mirroring?

every thing in this video is great except the accent .. it was really difficult to understand , i had to repeat it many times and decrease the speed .. but still excellent .

I wonder how controller know that h4 is connected to switcH ON PORT 4, since that are no packet out of h4 yet in the first place?

I cant thank you enough for this very informative video! Helped me out a lot

What fields does the open flow table have ? only inport and out port or anything else ?

Very informative tuto as an introduction I highly encourge you !

for the first time i got the feel of openflow.... if i will write my blog the first link about how to learn openflow will be this.... thanks again

Hey David, great video.

such worthful videos to watch,thank you so much for sharing them

so what message does the controller actually send to the switch??
whether it is a packet out message or flow modification message??

sir how to change host ip address

Best of Best lecture .thank you sir.....
sir, my FLOW modification packet does not show out port number .it is showing 0.what is the problem

out port : 0

Hello how can I use bitmask to match only the appropriate bits on eth_src?

Openflow concept well explained. It is about controlling the switches by utilizing flow tables and their entries. If no entry is matched in the switch, controller is then utilized to make new entry. Also, some wireshark example how to understand the openflow 'packets'

Great video, very helpful! please, how to create diagrams like in the video ? thanks

thank you so much, it' help me a lot to explain my presentation well tomorrow

Excellent video!! Thanks!!

Can i create a sdn topology without using mininet (i have a reason for that) ? Perhaps there is a way to add openflow protocol to a switch or a linux machine? Can you help?

thanks

I know this was 6 years ago, but something doesn't make sense. Back in the early days of networking, we had bridges which performed frame switching via software. This was a bit slow so frame switching was performed via the ASIC (ASIC - application-specific intergraded circuit). This allows frames to be processed at wire speed. Now we're back to a software implementation of switching. Don't get me wrong I fully understand the benefits, but how has switching via software improved with respect to speed vs switching via ASIC

nice video thanks!

Thanks for a splendid video on OpenFlow.

I've tried this but there were no OpenFlow packets being captured why ??

it's 2020 and you still have the best tutorials about this topic in the web. thank you so much David Mahler!

could you please make a tutorial about interacting with ovs without the command line?(I mean like adding and removing flow entries without using ovs-ofctl)

Is OpenFlow still worth learning in 2020? I heard it is dead

thank you

These videos are great. Thank you for making them!

Thank you so much this is resourceful

Really clear. Thanks.

Thanks David

Thanks for the Amazing Video.

Honestly, it is indeed painful for not having more videos from you on SDN. So many years have passed and I am still waiting if you come up with a new video on networking 😪😪

This is wonderful. I thank you very much this explanation.
🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏

please help me

Very good quality videos. I like the compact style, no waste of time and packed w/ well constructed content. Thank you very much.

Loved the explanation ! Just to the point

Very helpful

hi, I want to know if the buffer ID in the video has a value, but when OVS creates the bridge, n_buffer=0, which means the buffer is turned off. I would like to ask how it is turned on here.

you draw very well

you come where the week that is to come