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Joining a device to an Auto-RP multicast group

nwekechampion
Level 3
Level 3

Hi All,

If I wanted to get my device (listener) to

igmp-join

a specific group say 224.2.2.2, will

auto-rp

automatically detect it ?

From what I understand

Auto-RP

sends info about its RPs on 224.0.0.39-40.

How do I actually get my video client to listen on a specific multicast address in an

auto-rp

config?

Do I still need to configure the

 igmp join

request on the closest router to the device?

1 Accepted Solution

Accepted Solutions

M02@rt37
VIP
VIP

Hello @nwekechampion,

Auto-RP

uses specific multicast groups for RP mapping announcements and candidate RP advertisements. It does not directly handle

IGMP join

requests or control multicast group membership.

To get your video client to listen on a specific multicast address (such as 224.2.2.2) in an

Auto-RP

configuration, you still need to configure the

IGMP join

request on the closest router to the device.

 

 

Best regards
.ı|ı.ı|ı. If This Helps, Please Rate .ı|ı.ı|ı.

View solution in original post

8 Replies 8

M02@rt37
VIP
VIP

Hello @nwekechampion,

Auto-RP

uses specific multicast groups for RP mapping announcements and candidate RP advertisements. It does not directly handle

IGMP join

requests or control multicast group membership.

To get your video client to listen on a specific multicast address (such as 224.2.2.2) in an

Auto-RP

configuration, you still need to configure the

IGMP join

request on the closest router to the device.

 

 

Best regards
.ı|ı.ı|ı. If This Helps, Please Rate .ı|ı.ı|ı.

Thank you!!

Just labbed it and it worked!

 

HOwever, I have got a quick question.. Can I join different devices to different multicast groups on the same interface?

 

nwekechampion_0-1686548504740.png

nwekechampion_1-1686548596831.png

 Thanks

 

Hello @nwekechampion,

Yes, it is possible for different devices to join different multicast groups on the same interface. Each device can independently join the multicast groups it is interested in, and the network will deliver the corresponding multicast traffic to the appropriate devices.

Each device would send

IGMP join

messages specifying the multicast groups it wants to join. The network infrastructure, such as routers and switches, will use

IGMP

snooping to keep track of the multicast group memberships for each interface. When multicast traffic is sent to a specific group, the network will forward the traffic only to the interfaces where devices have joined that particular group.

So, if you have multiple devices connected to the same interface and each device wants to receive multicast traffic for different multicast groups, you can configure each device to join its desired multicast groups using

IGMP

 

Best regards
.ı|ı.ı|ı. If This Helps, Please Rate .ı|ı.ı|ı.

Thanks!!

I will try lab this case tonight with details 

MHM

How did you go with the labs?

My todo list is full, 
this lab I config LO 3.3.3.3 and it can server both multicast 229.5.5.1 229.6.6.1 in same time 
the LAB is using OSPF to connect all three routers in middle 

Screenshot (821).pngScreenshot (822).png

Many thanks @MHM Cisco World ..

I eventually figured this out whilst labbing it as well.
Apologies for my lare reply.. just have multiple projects coming out through my ears..

Appreciate the effort and the assistance.