Question please - I don't get it multicast signal is sent to multiple destinations, when the stream is live, does the traffic go all over the internet trying to find hosts/routers listening to the port/IP of the service? sounds like alot of traffic - this is most likely sacrilige question, but I come from CCNA, trying to understand Class D Addressing, and am deffo missing something. thank you.
Wow.. thank you! I am encountering multicast at work and this crash course helped me so much. Separating multicast into the L2 and L3 parts made it so much easier to digest. Also, now I understand how IGMP snooping plays into multicast.
How do L2 switches know to replicate packets to ports? Do L2 switches need to be upgraded for them to handle 33-33-xx-xx-xx-xx frames correctly? Does IPv6 MC membership operate on a voluntary membership basis or do routers and switches need to maintain membership states to know where to send subscribed streams?
Hi i need to learn how to do a multicast and what i need to do It i have a TV Station can you please show us a step by step guide of how to set It up and what is needed?
I'm battling to keep Apple Airplay connected to any device for longer than 15 mins, any advise? between 8-15 mins our stream dies and we have to try reconnect, sometimes warm rebooting the devices works , sometimes we have to remove the power and then connect. I have enabled IP Helper and mDNS and done the relevant WLAN to WLAN rules to get connection.
Thanks for the good explanation. May I ask you a question? I have a streamer running on my router OS embedded. The stream is coming over the udp to the multicast address. When I route the stream to my internal router interface (where PC is connected) VLC is successfully connecting and playing video. But I need to stream outside and when I rout the stream to the external interface I see the multicast traffic running (with tcpdump), but my VLC on my local PC doesn't connect anymore. My provider told me they have IGMP and PIM set and running. Unfortunately I cant check the stream as I have no other available PC. And the VLC on the smartphone doesn't support udp routing. What I misunderstood? What am I doing wrong?
How about queriers, that check if a client is still subscribed to that multicast? Otherwise it'll just keep sending data down that port. How I explain it, the highest level possible explanation: it's like a radio station. When you want to listen to a station, you just tune into that frequency. In any case that's missing a lot of points of course.
Can I make static routes of the multicast group addresses to narrow down the overlay path or will the routing table conflict with the igmp routes? Or will igmp override the routes and ignore them?
Just wanted to say that this is very well made and even a relative beginner like myself understood the more complex parts very well thanks to your wonderful explanation :)
Finally, somebody addressed L2 problem in "multicast introduction" Seriously, my first question when I heard "multicast is a transmission from one source to selected clients" was "cute, but how the hell Switch knows that this is multicast and does not flood it as unknown unicast?"
I LITERALLY came to youtube for your learning explaination ( YEP YEP *watches the video* ) 1.) get a high level overview of the topic first 2.) go in depth 3.) do examples/labs if there are any to do
I remember back in April when i was going through multicast and how good it felt when i finally could say "ok, i'm ready, next topic". Two VMs with VLC would do great for a GNS3 multicast lab. However i had some trouble with running both the sender and the receiver using the same hypervisor, but using two hypervisors (vmware player and virtualbox) will work just fine. This exam is not that hard. You'll have no trouble passing it. After checking the blueprints and watching reviews, i think the ENAUTO and ENARSI will be much harder exams than ENCOR. Your journey is an inspiration and i hope it will end in success. Good luck man!
This is perfect Knox. Knowing an overview of a topic makes it easier when facing the subject in detail later. I’m wondering if cbtnuggets should have this style nugget for each subject in a given course / certification. Thanks 👍🏻
Awesome explanation of multicast Knox! Funny my study methods are flipped a bit from yours, I always read books first, and then get a second easier to comprehend explanation from an expert via video!
explanation begins @1:53
yeah, could of been explained in 3 minutes not 5
@DaveThomson totally agree
Explanation starts at 1:54.
Why is the video 9 minutes
Viewers please cut to the chase and jump to 1:52 to start with multicast :-)
My understanding is that IGMP is a layer 3 protocol (network layer) not a layer 2 protocol, unlike IGMP snooping.
IGMP Layer 2
For many years i am looking for this one. So short n sweet. Thanks a lot and all the best for your ccie
Skip to 1:53 to save time.
The switch flood and how snooping works is good to know. Thanks.
It takes you 2 minutes to explain that you’re about to cover Multicast in 5 minutes? See the problem?
almost 2 mins to get to the point... nice!
IGMP is layer 3. Why are you saying it's layer 2? Did you mean IGMP snooping which is layer 2?
Good call out
Question please - I don't get it multicast signal is sent to multiple destinations, when the stream is live, does the traffic go all over the internet trying to find hosts/routers listening to the port/IP of the service? sounds like alot of traffic - this is most likely sacrilige question, but I come from CCNA, trying to understand Class D Addressing, and am deffo missing something. thank you.
Wow.. thank you! I am encountering multicast at work and this crash course helped me so much. Separating multicast into the L2 and L3 parts made it so much easier to digest. Also, now I understand how IGMP snooping plays into multicast.
How do L2 switches know to replicate packets to ports? Do L2 switches need to be upgraded for them to handle 33-33-xx-xx-xx-xx frames correctly?
Does IPv6 MC membership operate on a voluntary membership basis or do routers and switches need to maintain membership states to know where to send subscribed streams?
Hi i need to learn how to do a multicast and what i need to do It i have a TV Station can you please show us a step by step guide of how to set It up and what is needed?
start at 1:55
I'm battling to keep Apple Airplay connected to any device for longer than 15 mins, any advise? between 8-15 mins our stream dies and we have to try reconnect, sometimes warm rebooting the devices works , sometimes we have to remove the power and then connect. I have enabled IP Helper and mDNS and done the relevant WLAN to WLAN rules to get connection.
Thanks for the good explanation.
May I ask you a question?
I have a streamer running on my router OS embedded. The stream is coming over the udp to the multicast address.
When I route the stream to my internal router interface (where PC is connected) VLC is successfully connecting and playing video.
But I need to stream outside and when I rout the stream to the external interface I see the multicast traffic running (with tcpdump), but my VLC on my local PC doesn't connect anymore.
My provider told me they have IGMP and PIM set and running.
Unfortunately I cant check the stream as I have no other available PC. And the VLC on the smartphone doesn't support udp routing.
What I misunderstood? What am I doing wrong?
Why does the router not use the destination mac adres of the guy in his network who wants to have the stream? Is it because that is unicast-like?
Why are CCNP and CCIE topics showing-up on my CCNA Boson practice exam?????? Very frustrating.
I do exactly the same thing, nugget, book, practice exams, & labs. I use boson for practice exams and labs!
Hi Knox, Great explanation on Multicast in 5 minutes. Good job! I hope your child is doing much better. Stay safe, Gus.
5 minutes? the video is over 9 mins long
Hi Knox, is there some LABS about Multicast? thanks
Broadcast wouldn't work in this scenario right? Due to the recipients being in a different broadcast domain?
How about queriers, that check if a client is still subscribed to that multicast? Otherwise it'll just keep sending data down that port.
How I explain it, the highest level possible explanation: it's like a radio station. When you want to listen to a station, you just tune into that frequency. In any case that's missing a lot of points of course.
Which PIM mode uses a shared tree only?
Isn't igmp layer 3?
Anyone know what he's using for a whiteboard here?
4:10 umm, why is 224.1.2.3 being routed to 10.0.1.10????? the IPs do not match
Video starts at 1:54
need this for ndi digital signage
Can I make static routes of the multicast group addresses to narrow down the overlay path or will the routing table conflict with the igmp routes? Or will igmp override the routes and ignore them?
im a nerd and now want to understand multicast IGMP snooping within a VLAN
Sure buddy
@@bartomiejpotaman6973 welp just configured a stacked switch for it so yeah. Doing pretty good.
Latitude on your camera is great. Which model are you using?
You can find my gear at Amazon.com/shop/dataknox
so what is the best multicast rate for gaming??
Just wanted to say that this is very well made and even a relative beginner like myself understood the more complex parts very well thanks to your wonderful explanation :)
Finally, somebody addressed L2 problem in "multicast introduction"
Seriously, my first question when I heard "multicast is a transmission from one source to selected clients" was "cute, but how the hell Switch knows that this is multicast and does not flood it as unknown unicast?"
That's exactly why I wanted to spend some extra time on it! I was stuck there, too
Exactly! This is the key that should always be taught, but isn’t... Great video.
Thank you and best of luck with your studies and exam
Wow…short, sweet and to the point!
good video, content starts at 1:55
I thought IGMP is layer 3. IGMP Snopping is Layer 2 I believe
I LITERALLY came to youtube for your learning explaination ( YEP YEP *watches the video* )
1.) get a high level overview of the topic first
2.) go in depth
3.) do examples/labs if there are any to do
I remember back in April when i was going through multicast and how good it felt when i finally could say "ok, i'm ready, next topic". Two VMs with VLC would do great for a GNS3 multicast lab. However i had some trouble with running both the sender and the receiver using the same hypervisor, but using two hypervisors (vmware player and virtualbox) will work just fine.
This exam is not that hard. You'll have no trouble passing it. After checking the blueprints and watching reviews, i think the ENAUTO and ENARSI will be much harder exams than ENCOR.
Your journey is an inspiration and i hope it will end in success.
Good luck man!
ENAUTO was challenging, but nowhere near as hard as DEVCOR. With the right study plan and practice, ENAUTO is definitely passable
This is perfect Knox. Knowing an overview of a topic makes it easier when facing the subject in detail later. I’m wondering if cbtnuggets should have this style nugget for each subject in a given course / certification. Thanks 👍🏻
Excellent explanation, I also started studying for the ENCOR exam, how do you recommend lab MST?
EVE-NG, or buy some switches off eBay!
Good video short and precise
3882 Verla Ridges
Thanks a thousand! It explained all my basic questions, especially the second part with the switch layer!
Bravo. This is great explanation.
Awesome explanation of multicast Knox! Funny my study methods are flipped a bit from yours, I always read books first, and then get a second easier to comprehend explanation from an expert via video!
This was awesome! thank you!
Love it Knox, Thanks.!
Brilliant explanation
I hope your child is well by now. Thank you for the video, I was able to have a better a idea about multicast now
You did it , I think this is how zoom and WebEx work in the cloud ..., Aren't they ?
Nice shot 👌
Wooow....really nicely explained
This was brilliant. Very well done sir!
Didnt you mean explained in 9minutes and 13 seconds?
Thanks for the simple explanation!
Great Job!
Moses?
I should’ve watched this video before I lost my hair.
Awesome. Great overview
did u say FAMILY? that right don
Nice job 👌
Omfg, you nailed it!!! Thanks!
Thank you! At least, I hope I learn.
You are a savior!
Really nice explanation. Thanks.
Subscribed (:
If you close your eyes it sounds like micky mouse is doing the voiceover 😂, great video tho
Great video! Simple and easy to follow!
Nice beard brother!
It’s getting there!
Great
great
is this how college librarys send messages "5 minutes before this computer turns off"???????
blud this first minute or so ur simply yappin get to the point
The background music is very distracting. I can't focus on what you're saying...
halfway through on the text book wooow
IGMP is layer 3
2 minutes of a 9 minute video spent not explaining the thing in the title, nice job
That vibrating death star is really annoying :(
The CCNA R&S didn't go into multicast a whole lot. I've kind of been wondering how it works in full detail.
Video starts at 1:55