Multicasting Help

[oneirishpollack]

I have been trying to understand the technical steps to setting up multicasting and I am just not getting it. I would appreciate any help I could get.

I have a multicast source (server 10.4.93.10).

I have two multicast receivers (10.4.93.100 and 10.4.94.100).

I enabled multicast on my core router using ip multicast routing

The VLAN is setup as follows:

interface Vlan93

description movies

ip address 10.4.93.1 255.255.255.0

no ip redirects

ip pim sparse-dense-mode

I would like the multicast address to be 239.239.239.239

How do I setup this network for my clients (10.4.93.100 and 10.4.94.100) to join the multicast group (239.239.239.239) so they will be sent the video feed?

[Reza Sharifi]

under interface vlan93 configure igmp join group

ip igmp join-group 239.239.239.239

[Luc De Ghein]

Hi,

I'd guess you have more than one router. If so, please look at some multicast docs on www.cisco.com.

Basically, you'll need to:

-enable multicast routing on the routers

-enable PIM (on the interfaces)

-choose PIM mode:

     PIM sparse mode

     PIM BiDir

     PIM source specific mode  (SSM) (receiver needs to support IGMPv3)

(do not use dense mode, it's getting old )

For the first 2, you'll need a mechanism to have all the PIM routers know which router is the rendez-vous point. For SSM, you'll need to configure an SSM range command.

Do not use the join-group command, unless you'll want the routers to be receivers themselves, which is a bad idea.

Use igmp static-group interface command to have the routers statically forward the multicast group.

Thanks,

Luc