Multicast Explained in 5 Minutes | CCIE Journey for Week 6-12-2020

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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[chandruonmuzic]

For many years i am looking for this one. So short n sweet. Thanks a lot and all the best for your ccie

[HollowGrey]

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.

[Gus_Leon]

Hi Knox, Great explanation on Multicast in 5 minutes. Good job! I hope your child is doing much better. Stay safe, Gus.

[joeford]

My understanding is that IGMP is a layer 3 protocol (network layer) not a layer 2 protocol, unlike IGMP snooping.

[SamuelGermain]

I do exactly the same thing, nugget, book, practice exams, & labs. I use boson for practice exams and labs!

[blatchie]

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 :)

[taokichavez]

almost 2 mins to get to the point... nice!

[anachronic-vibes]

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!

[parheliaa]

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?"

[sidefmovies]

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 👍🏻

[vasilybortnikov]

Didn't catch it. IGMP should be on L3, but IGMP snooping...

[chansetwo]

Why are CCNP and CCIE topics showing-up on my CCNA Boson practice Very frustrating.

[dkoxperiakoziukov]

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?

[gregorysmith]

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.

[tdragon]

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.

[TehObLiVioUs]

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

[mmccrackn]

The switch flood and how snooping works is good to know. Thanks.

[davidjohnson]

IGMP is layer 3. Why are you saying it's layer 2? Did you mean IGMP snooping which is layer 2?

[lohphat]

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?

[MegaFiredon]

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?