2.2.a Implement and troubleshoot IGMP

  • 2.2.a [v] IGMP proxy

An IGMP proxy enables hosts in a unidirectional link routing (UDLR) environment that are not directly connected to a downstream router to join a multicast group sourced from an upstream network.

Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 2077-2078).  . Kindle Edition.

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_igmp/configuration/xe-3se/5700/imc-igmp-xe-3se-5700-book/imc_igmp_proxy.html#GUID-FB6934DC-DEEA-4629-B517-3158C0EB2FC2