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Configuring IP Multicasting
7-11
Types of Multicast Support
Using Site Manager, the network administrator can specify various types of
multicast support for a circuit. (The first two and the last three are mutually
exclusive.)
IGMP host membership queries enabled. For a circuit that connects the router
to a network with a host that may become a member of one or more
multicasting groups. The network administrator configures IGMP on the
circuit and enables host queries by setting the Interface Query Rate parameter
to a nonzero value.
IGMP host membership queries disabled. For a circuit that connects the router
to a network that has no multicasting hosts. The network administrator
configures IGMP on the circuit but disables queries by setting the Interface
Query Parameter to zero.
IGMP/DVMRP support with circuit-routing support. For a circuit that
connects the router to a network that requires the propagation of multicast
datagrams. The network configures IGMP (as described above) and DVMRP
on the circuit and enables the circuit for routing.
IGMP/DVMRP support for tunnels with circuit-routing support. For a circuit
that links the router to one or more remote multicasting routers via tunnels
and that also propagates multicast datagrams. The network administrator
configures IGMP (as above) and DVMRP on the circuit and uses the DVMRP
Tunnel Parameters window (Figure 7-4) to configure one or more tunnels on
the circuit.
IGMP/DVMRP support for tunnels without circuit-routing support. For a
circuit that links the router to one or more remote multicasting routers via
tunnels but that should not be allowed to propagate multicast datagrams. The
network configures IGMP and DVMRP on the circuit, uses the DVMRP
Tunnel Parameters window to configure one or more tunnels on the circuit,
and sets the Route Enable parameter in the circuit entry to Disabled.
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