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- เผยแพร่เมื่อ 6 ก.ย. 2024
- Multicast is a little different from the unicast routing that we know and love. So how does a multicast routing table really work? IGMP and PIM are the secret sauces that make multicast routing work, so I'm going to try to break down IGMP, PIM, and multicast routing in under 5 minutes! Plus, we'll talk about how my CCIE journey is coming along as I prepare for the ENCOR exam using the certification guide and CBT Nuggets training.
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explanation begins @1:53
Why is the video 9 minutes
Hi Knox, Great explanation on Multicast in 5 minutes. Good job! I hope your child is doing much better. Stay safe, Gus.
My understanding is that IGMP is a layer 3 protocol (network layer) not a layer 2 protocol, unlike IGMP snooping.
IGMP Layer 2
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.
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 :)
Explanation starts at 1:54.
For many years i am looking for this one. So short n sweet. Thanks a lot and all the best for your ccie
I do exactly the same thing, nugget, book, practice exams, & labs. I use boson for practice exams and labs!
Skip to 1:53 to save time.
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.
Didn't catch it. IGMP should be on L3, but IGMP snooping...
Viewers please cut to the chase and jump to 1:52 to start with multicast :-)
im a nerd and now want to understand multicast IGMP snooping within a VLAN
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!
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
start at 1:55
Thanks a thousand! It explained all my basic questions, especially the second part with the switch layer!
The switch flood and how snooping works is good to know. Thanks.
Wow…short, sweet and to the point!
Video starts at 1:54
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 hope your child is well by now. Thank you for the video, I was able to have a better a idea about multicast now
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?
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.
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.
Why are CCNP and CCIE topics showing-up on my CCNA Boson practice exam?????? Very frustrating.
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?
Thank you and best of luck with your studies and exam
Broadcast wouldn't work in this scenario right? Due to the recipients being in a different broadcast domain?
The CCNA R&S didn't go into multicast a whole lot. I've kind of been wondering how it works in full detail.
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?
Isn't igmp layer 3?
I thought IGMP is layer 3. IGMP Snopping is Layer 2 I believe
This was brilliant. Very well done sir!
Which PIM mode uses a shared tree only?
almost 2 mins to get to the point... nice!
good video, content starts at 1:55
Bravo. This is great explanation.
Hi Knox, is there some LABS about Multicast? thanks
IGMP is layer 3. Why are you saying it's layer 2? Did you mean IGMP snooping which is layer 2?
Good call out
4:10 umm, why is 224.1.2.3 being routed to 10.0.1.10????? the IPs do not match
Anyone know what he's using for a whiteboard here?
Good video short and precise
You did it , I think this is how zoom and WebEx work in the cloud ..., Aren't they ?
Brilliant explanation
This was awesome! thank you!
Thanks for the simple explanation!
Omfg, you nailed it!!! Thanks!
Nice shot 👌
Love it Knox, Thanks.!
so what is the best multicast rate for gaming??
Excellent explanation, I also started studying for the ENCOR exam, how do you recommend lab MST?
EVE-NG, or buy some switches off eBay!
Latitude on your camera is great. Which model are you using?
You can find my gear at Amazon.com/shop/dataknox
Wooow....really nicely explained
You are a savior!
I should’ve watched this video before I lost my hair.
Awesome. Great overview
Great Job!
Really nice explanation. Thanks.
Subscribed (:
Nice job 👌
Great video! Simple and easy to follow!
Didnt you mean explained in 9minutes and 13 seconds?
Thank you! At least, I hope I learn.
Great
It takes you 2 minutes to explain that you’re about to cover Multicast in 5 minutes? See the problem?
did u say FAMILY? that right don
great
Moses?
The background music is very distracting. I can't focus on what you're saying...
If you close your eyes it sounds like micky mouse is doing the voiceover 😂, great video tho
Nice beard brother!
It’s getting there!
is this how college librarys send messages "5 minutes before this computer turns off"???????
halfway through on the text book wooow
IGMP is layer 3
That vibrating death star is really annoying :(
blud this first minute or so ur simply yappin get to the point
2 minutes of a 9 minute video spent not explaining the thing in the title, nice job
Video starts at 1:55