Multicast configuration

[dianawinskymartin]

Hi, I'm new to multicast configuration. I have a core switch (C9300) and an access switch (C1200). The requirement is to enable multicast in only one VLAN (for IPTV), while another VLAN (the IT VLAN) should be able to communicate with it. Could you guide me on how to configure this?

[chrihussey]

Hello, 

If you are only going to have multicast present and confined to one VLAN and don't have to route a multicast across VLANs or from another location there really isn't much you need to do other than perhaps configure "ip igmp snooping querier" on one switch, probably the 9300. This will make that switch take the role of the multicast router and then based on that multicasts will only be sent to the receivers that want to get it. Admittedly, I'm not familiar with the C1200 switches, but if they are CLI and like the 9300 you should be OK.

Hope this helps.

[Cristian Matei]

Hi,

  Multicast configuration means IGMP, PIM and possibly RP (unless you're using static RP or SSM); for your case, it means you'll configure PIM across all your upstream links (between sender and receiver), and on the edge switch only on the VLAN (SVI / layer 3 interface) where multicast needs to work (this way all other VLAN's will not run or be influenced by multicast).

   Of course, a lot of details go along with it, but high-level, this is it.

Best,

Cristian.