Igmp Proxy - ZyXEL Communications ZyWall USG20-VPN User Manual

Chapter 9 Interfaces
Set the priority used to identify the DR or BDR if one does not exist.

IGMP Proxy

USG
Internet Group Management Protocol (IGMP) proxy is used for multicast routing. IGMP proxy enables the
USG
to issue IGMP host messages on behalf of hosts that the discovered on its IGMP-enabled interfaces. The
USG
acts as a proxy for its hosts. Refer to the following figure.
• DS: Downstream traffic
• US: Upstream traffic
• R: Router
• MS: Multicast Server
• Enable IGMP Upstream (US) on the USG interface that connects to a router (R) running IGMP
that is closer to the multicast server (MS).
• Enable IGMP Downstream on the USG interface which connects to the multicast hosts.
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