Enabling Igmp Proxy; Enabling Multicast Forwarding - HP 7102dl - ProCurve Secure Router Configuration Manual

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Enabling IGMP Proxy

If you want a stub network to receive multicast messages from a remote
network, you must enable IGMP proxy on the interface connecting to the stub
network.
The following command enables the downstream interface to forward IGMP
reports to the multicast server at the helper address:
ProCurve(config-eth 0/1)# ip mcast-stub helper-enable
You must set the actual helper address globally. (See "Setting the Multicast
Helper Address" on page 12-12.)
If you do not enter this command, the upstream interface send joins towards
the multicast source; the router will not forward multicasts to local hosts
because it will not itself receive the multicast traffic.
Even though you have enabled the router to act as a multicast host to a remote
router, the downstream interface still acts as a multicast agent for directly
connected local hosts.

Enabling Multicast Forwarding

Entering ip mcast-stub downstream automatically enables multicast for-
warding through the interface. When the interface, acting as a multicast agent,
determines that the connected network contains hosts for a specific multicast
address, the router adds that address to its multicast routing table. The entry
includes the downstream interface as the "outgoing" interface. When the
router receives a packet destined to the multicast address, it forwards it out
the outgoing interfaces listed in the multicast table.
You must enable IP multicast routing globally in order for an interface to
forward multicast messages. (See "Enabling IP Multicast Routing" on page
12-12. Multicast routing is disabled by default.) If IP multicast routing is
disabled, the interface will only run IGMP.
Configuring Multicast Support for a Stub Network
Configuring IGMP Proxy for Multicast Stub Routing Support
12-15