Clearing Multicast Router Ports; Clearing Multicast Group Entries; Understanding How Rgmp Works - Cisco WS-C6506 Software Manual

Chapter 51 Configuring Multicast Services

Clearing Multicast Router Ports

To clear the manually configured multicast router ports, perform one of these tasks in privileged mode:
Task
Clear the specific, manually configured multicast
router ports.
Clear all manually configured multicast router
ports.
This example shows how to clear a manually configured multicast router port:
Console> (enable) clear multicast router 2/12
Port 2/12 cleared from multicast router port list.
Console> (enable)

Clearing Multicast Group Entries

To clear the manually configured multicast group entries from the CAM table, perform this task in
privileged mode:
Task
Clear a multicast group entry from the CAM
table.
This example shows how to clear a multicast group entry from the CAM table:
Console> (enable) clear cam 01-11-22-33-44-55 1
CAM entry cleared.
Console> (enable)

Understanding How RGMP Works

RGMP constrains the multicast traffic that exits the switch through the ports to which only the
disinterested multicast routers are connected. Catalyst 6500 series switches support RGMP, which
enables a switch to reduce network congestion by forwarding the multicast data traffic to only those
routers that are configured to receive it.
Note To use RGMP, you must enable IGMP snooping on the switch. IGMP snooping constrains the multicast
traffic that exits through the switch ports to which the hosts are connected. IGMP snooping does not
constrain the traffic that exits through the ports to which one or more multicast routers are connected.
You must enable PIM on all routers and switches for RGMP to work. Currently, only PIM sparse mode
Note
is supported.
OL-8978-04
Command
clear multicast router mod/port
clear multicast router all
Command
clear cam mac_addr [vlan]
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Understanding How RGMP Works
51-29