n.nandrekar Fri, 05/30/2008 - 00:52
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hi!

For a multicast network, you need both Igmp as well as a multicast routing protocol ( PIM/DVMRP etc.)

The routing protocol works between the routers to send the multicast stream from the source router to the end router. This is the work of PIM ( note that PIM requires any unicast igp for its working).

Igmp comes into play for the leafs where it actually conducts the information of the host's intntions to join a multicast stream to the end router.

So in summary, PIM works in the core while igmp at the leafs.

The following link will give you more details on the matter :

www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.1/19ew/configuration/guide/mcastmls.pdf


Cheers!

Niranjan.

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