Cisco Field Manual. Catalyst Switch Configuration

9-4. RGMP

  • RGMP is a dynamic protocol that controls multicast traffic to multicast routers.

  • With RGMP, a switch must still use IGMP snooping to constrain multicast traffic to interested hosts.

  • RGMP can communicate only with routers that also run RGMP. Routers periodically send RGMP hello messages to switches.

  • Routers that are interested in receiving traffic for a multicast group send an RGMP join request to the switch. Otherwise, the switch will not forward multicast traffic to the router.

  • RGMP supports the use of PIM sparse mode only on multicast routers.

Configuration

1.

Enable IGMP snooping on the switch. See section "9-1: IGMP Snooping" for the necessary switch configuration steps.

2.

Enable PIM sparse mode multicast routing on a router.

Refer to Cisco Field Manual: Router Configuration (ISBN 1-58705-024-2), section "7-7: IP Multicast Routing" for the router configuration steps.

3.

(Router only) Enable RGMP on the router:

IOS

(interface) ip rgmp

RGMP must be enabled on the router interfaces that connect to RGMP-capable switches.

4.

Enable RGMP on the switch:

COS

set rgmp {enable | disable}

IOS

N/A

By default, RGMP is disabled.

Displaying Information About RGMP

Table 9-5 lists some switch commands that you can use to display helpful information about RGMP.

Table 9-5. Switch Commands to Display RGMP Information

Display Function

Switch OS

Command

RGMP statistics

COS

show rgmp statistics [vlan]

IOS

N/A

Multicast groups requested by RGMP router

COS

show rgmp group [mac-addr] [vlan-id]

IOS

N/A

Number of multicast groups requested by RGMP router

COS

show rgmp group count [vlan-id]

IOS

N/A

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