
Configuring IP Multicasting and Multimedia Services
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Starting IGMP
IGMP is required for all types of multicasting. If you want the router to receive
and forward multicast packets (that is, packets with destination addresses from
224.0.0.255 through 239.255.255.255), IGMP must be running on the slot and
circuit -- even if the circuit is a point-to-point circuit that will not be involved in
IGMP group queries and join messages.
You can start IGMP using the BCC or Site Manager.
Using the BCC
To start IGMP on an interface with default values, navigate to the IP interface
prompt (for example,
box; ethernet/2/2; ip/1.2.3.4/255.255.255.0
) and enter
igmp
:
ip/1.2.3.4/255.255.255.0#
igmp
igmp/1.2.3.4#
Using Site Manager
When you configure any multicast protocol described in this guide (DVMRP,
MOSPF, or PIM), Site Manager automatically configures IGMP on the slot and
circuit.
To start IGMP on a router interface that does not have another multicast protocol
configured:
1.
Configure a circuit on a slot and connector.
2.
Configure an IP interface on the circuit.
3.
Add IGMP to the interface.
For information and instructions on using Site Manager to configure a circuit on a
slot and connector, see Configuring WAN Line Services or Configuring Ethernet,
FDDI, and Token Ring Services.
Note:
If you plan to start DVMRP, MOSPF, or PIM using Site Manager, go to
the appropriate section in this chapter. Site Manager automatically enables
IGMP when you configure DVMRP, MOSPF, or PIM.
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