The concept of Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) snooping requires the ability to identify the location of multicast routers. Since snooping is not standardized@ there are many mechanisms in use to identify the multicast routers. However@ this can lead to interoperability issues between multicast routers and snooping switches from different vendors. This document introduces a general mechanism that allows for the discovery of multicast routers. This new mechanism@ Multicast Router Discovery (MRD)@ introduces a standardized means of identifying multicast routers without a dependency on particular multicast routing protocols.