Cisco Systems 78-11741-02 manual Rgmp Overview, IPC-528

Configuring Router-Port Group Management Protocol

RGMP Overview

Figure 88 shows where these protocols operate within the IP multicast environment.

Figure 88 IP Multicast Routing Protocols

Catalyst 5000 switch

Host

CGMP

Host

PIM

IGMP

Internet

MBONE

DVMRP

43274

Note CGMP and RGMP cannot interoperate on the same switched network. If RGMP is enabled on a switch or router interface, CGMP is automatically disabled on that switch or router interface; if CGMP is enabled on a switch or router interface, RGMP is automatically disabled on that switch or router interface.

RGMP Overview

RGMP enables a router to communicate to a switch the IP multicast group for which the router would like to receive or forward traffic. RGMP is designed for switched Ethernet backbone networks running PIM sparse mode (PIM-SM) or sparse-dense mode.

Note RGMP-enabled switches and router interfaces in a switched network support directly connected, multicast-enabled hosts that receive multicast traffic. RGMP-enabled switches and router interfaces in a switched network do not support directly connected, multicast-enabled hosts that source multicast traffic. A multicast-enabled host can be a PC, a workstation, or a multicast application running in a router.

Figure 89 shows a switched Ethernet backbone network running PIM in sparse mode, RGMP, and IGMP snooping.

Cisco IOS IP Configuration Guide

IPC-528