Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

IGMP Configuration in Real World

Do we need to configure IGMP on Host, Switch or Router.

VIP Purple

It does help if you have a

It does help if you have a lot of multicast traffic on same vlan IGMP helps , if between layer 3 vlans pim will help , it just makes sure traffic is set to multicast instead of flooding a broadcast

New Member

Let me make my question more

Let me make my question more clear using typical setup:

We have a host connected to the LAN-->Switch-->Router.

Host is the receiver, router sends Membership Query and host responds using Membership Report, PIM is configured on the router's interface towards another router and not towards the host.

There is a switch in between them (Router & Host), we can configure IGMP snooping in the switch, now the question is:

What do we need to configure on the host and the router's interface towards the host that will enable router to send Membership Query and Host to responds using Membership Report.


  1. Nothing on the router's interface towards the host.
  2. The multicast client application installed in the host will empower it to send Membership/IGMP Report.


if nothing on the router, then how router will send Membership Queries towards the Hosts?

New Member

You need to configure PIM on

You need to configure PIM on the inside router interface , toward host , . Your snooping switch need general queries to be able to snooop , it will flood otherwise 



On the switch

1) ip igmp snooping querier
2 )ip igmp snooping vlan xxx mrouter interface x/x (facing the router)
3) Enable pim on the switch L3 interface ( if applicable)


Please don't forget to rate any posts that have been helpful. Thanks.