Multicasting via VLAN interfaces

[mitchbutter1210]

How would one implement multicasting on a network where there is a L3 core switch routing multiple VLANs and several access switches connected to the core? I am a complete newbie to multicasting but the issue is that there are a couple hundred video devices that are streaming to about 4 clients (all on seperate VLANs) and there is a definite video lag on these clients when viewing video. I would presume that this is caused by the cameras being overwhelmed by all the clients streaming at the same time. It is my understanding that multicasting could solve this problem. As a newbie, what would the easiest and most efficient way to implement multicasting be?

[johnd2310]

Hi,

Will need more details on your network.   What model switches are you using for  access and core?

Thanks

John

[mitchbutter1210]

The core is a 4507 and the access switches are 3850s.

[Giuseppe Larosa]

Hello Mitch,

you need to enable IP multicast routing on the core switch

ip multicast-routing

+

interface Vlan X

ip pim sparse-dense mode

for all the Vlans of interest ( including video sources and possible receivers)

On Cat3850 access switches verify that IGMP snooping is enabled.

Note: the clients need to send IGMP reports to get the desired stream. If they do not join the stream they will not receive anything (because of IGMP snooping on access switches)

Hope to help

Giuseppe

[mitchbutter1210]

Thank you for the quick reply! I have followed your instructions and after a few minutes it seems I lose the ability to ping across my network (perhaps due to a flood?). It seems as if it could be some kind of network flood as I slowly lose connectivity to my devices. Is there another command I am perhaps missing?