Multicast IGMP Proxy - NetworkLessons.com
networklessons.com › multicast-igmp-proxyIGMP Proxy allows hosts in a UDLR (Unidirectional Link Routing) topology that are not directly connected to a downstream router to join a multicast group from an upstream router by using a back channel. To understand IGMP proxy, let’s first look at what a UDL (Unidirectional Link) is. A UDL is a link where traffic only goes one way.