IP Multicast Monitoring and Troubleshooting

Table 37 summarizes the command-line interface (CLI) commands you can use to monitor IP multicast. In the table, the commands are grouped by functionality. In the remainder of this chapter, they are explained alphabetically.

Table 37: Commands for Monitoring IP Multicast

Task Category	Task or Information to Monitor	Command
Generic IP Multicast Information	Entries in the multicast forwarding cache	`show multicast route`
	Entries in the multicast next-hop table	`show multicast nexthops`
	Multicast reverse-path-forwarding calculations	`show multicast rpf`
	Administratively scoped addresses	`show multicast scope`
	Announced multicast sessions	`show multicast sessions`
	Multicast statistics	`show multicast statistics`
	Clear multicast statistics	`clear multicast statistics`
	Most active multicast groups	`show multicast usage`
	Trace information about a multicast path	`mtrace` `mtrace from-source` `mtrace monitor` `mtrace to-gateway`
	Multicast network configuration information.	`show multicast mrinfo`
DVMRP	DVMRP and PIM tunnels	`show multicast tunnels`
	DVMRP neighbors	`show dvmrp neighbors`
	DVMRP prefixes	`show dvmrp prefix`
	DVMRP prunes	`show dvmrp prunes`
	Status of interfaces on which DVMRP is configured	`show dvmrp interfaces`
	Most active DVMRP groups	`show multicast usage`
MLD	Clear MLD group members	`clear mld membership`
	Clear MLD statistics	`clear mld statistics`
	Members of MLD groups	`show mld group`
	Members of MLD groups by interface	`show mld interface`
	MLD statistics	`show mld statistics`
MSDP	MSDP peers	`show msdp`
	Clear MSDP source active cache	`clear msdp cache`
	MSDP statistics	`show msdp statistics`
	Clear MSDP statistics	`clear msdp statistics`
	Test MSDP peers	`test msdp`
PIM	Bootstrap routers	`show pim bootstrap`
	PIM groups	`show pim join`
	Clear the PIM join and prune states	`clear pim join`
	Status of interfaces on which PIM is configured	`show pim interfaces`
	PIM neighbors	`show pim neighbors`
	Rendezvous points	`show pim rps`
	PIM source RPF state	`show pim source`
	PIM (,,RP) join and prune states	`show sap listen`
	PIM statistics	`show pim statistics`
	Clear PIM statistics	`clear pim statistics`
	Most active PIM groups	`show multicast usage`
IGMP	Members of IGMP groups	`show igmp group`
	Members of IGMP groups by interface	`show igmp interface`
	Clear IGMP group members	`clear igmp membership`
	IGMP statistics	`show igmp statistics`
	Clear IGMP statistics	`clear igmp statistics`
SAP/SDP	Session announcement addresses	`show sap listen`