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From the Doc DVD:

•Before performing the tasks in this module, you should be familiar with the concepts described in “IP Multicast Technology Overview” module.

•You must have enabled multicast routing and performed at least one basic multicast configuration task. Refer to the “Configuring Basic IP Multicast” module for more information.

How to Verify IP Multicast Operation

This section contains the following procedures:

•Starting to Use IP Multicast (required)

•Locating a Faulty Hop (optional)

Starting to Use IP Multicast

Perform this task to start using IP multicast in your network.

If all the multicast-capable routers and access servers that you administer are members of a multicast group, pinging that group causes all routers to respond, which can be a useful administrative and debugging tool.

Another reason to have a router join a multicast group is when other hosts on the network have an Interior Gateway Routing Protocol (IGRP) configuration that prevents them from correctly answering IGMP queries. Having the router join the multicast group causes upstream routers to maintain multicast routing table information for that group and keep the paths for that group active.

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