
Configuring and Customizing IGMP
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3-35
In Figure 3-2, multicast traffic is forwarded from a nonmulticast network to a
nonmulticast interface on the router and is sent out through multicast interfaces on
the same router. To create an IGMP static forwarding policy for this type of
scenario:
• Set the forwarding mode to “static to dynamic.”
• Specify the in circuit (in this example, IGMP interface 1).
• Set the inbound IGMP circuit’s static forward cache lifetime to a value
appropriate for the multicast protocol that will be transferring the traffic out of
the router. For instructions, see “Specifying the Static Forward Cache
Lifetime” on page 3-27.
Figure 3-2. Forwarding Multicast Traffic from a Static Network to a
Dynamic Network
Unicast network
Multicast traffic
Multicast network
Multicast receivers
Router with
DVMRP or MOSPF
multicast protocols
on outgoing interfaces
Configure IGMP static
forwarding policy as follows:
Forwarding Mode: Static to Dynamic
In Circuit: Specify interface 1
1 IGMP
HostHost
Traffic forwarded
per multicast
protocol rules
IP0103A
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