Multicast within a VLAN

[monkp]

I am setting up a multicast application within a particular VLAN. What commands if any are necessary for this to work.

IGMP snooping is anabled by default...Does IGMP need to be enabled on the VLAN interface for this to work?

Is there a way to view the IGMP snooping tables?

[Prashanth Krishnappa · Accepted solution]

What platform are you using? IGMP snooping is enabled by default. Configure a router in the VLAN to act as IGMP querier by configuring multicast routing and PIM. The following page should help.

http://www.cisco.com/warp/public/473/cat_multicast_prob.html

[monkp]

prkrishn ... I failed to mention that this is all within the same 6513 switch. This document looks like it applies to VLAN spanning multiple switches.

Does IGMP need to be enable on that VLAN Interface?

[Prashanth Krishnappa]

If you have a 6513, IGMP snooping is enabled by default. It is still a good idea to enable multicast routing and PIM on the VLAN interface to constrain multicast traffic. Or you can enabled IGMP querier if you are running newer software.

http://www.cisco.com/warp/public/473/38.html

[monkp]

Which would be the preferred method if IGMP querier is availble?

Also, You say this is a good idea ...Would multicasting within the VLAN "NOT" work without enabling one of the two methods?

Do I need to enable IGMP on the VLAN interface?

[Prashanth Krishnappa]

I said its a good idea because it constrains Multicast traffic. If everything is in one VLAN it should work but you could see flooding and unexpected behavior. IGMP is not a VLAN interface command.

[monkp]

The Following command worked ... it enabled IGMP and Multicast on the VLAN Interface and the applcation works.

Router-1(config-if)#ip pim sparse-dense-mode

Thanks for your help