Cisco Systems 78-11741-02 manual IPC-446

Configuring IP Multicast Routing

Monitoring and Maintaining IP Multicast Routing Configuration Task List

Clearing Caches, Tables, and Databases

You can remove all contents of a particular cache, table, or database. Clearing a cache, table, or database can become necessary when the contents of the particular structure have become, or are suspected to be, invalid.

To clear IP multicast caches, tables, and databases, use the following commands in EXEC mode as needed:

Command	Purpose
Router# clear ip cgmp	Clears all group entries the Catalyst switches have cached.
Router# clear ip igmp group [group-name	Deletes entries from the IGMP cache.
group-address type number]
Router# clear ip mroute {* group-name	Deletes entries from the IP multicast routing table.
[source-name source-address] group-address
[source-name source-address]}
Router# clear ip pim auto-rp rp-address	Clears the Auto-RP cache.
Router# clear ip rtp header-compression [type	Clears RTP header compression structures and statistics.
number]
Router# clear ip sap [group-address	Deletes the SAP cache or a SAP cache entry. The session name
“session-name”]	is enclosed in quotation marks (“ ”) that the user must enter.

Displaying System and Network Statistics

You can display specific statistics such as the contents of IP routing tables, caches, and databases. Information provided can be used to determine resource utilization and solve network problems. You can also display information about node reachability and discover the routing path the packets of your device are taking through the network.

To display various routing statistics, use the following commands in EXEC mode, as needed:

Command			Purpose
Router# ping [group-name group-address]			Sends an ICMP echo request message to a multicast group
			address.
Router# show frame-relay ip rtp header-compression			Displays Frame Relay RTP header compression statistics.
[interface type number]
Router# show ip igmp groups [group-name			Displays the multicast groups that are directly connected to
group-address		type number] [detail]	the router and that were learned via IGMP.
Router# show ip		igmp interface [type number]	Displays multicast-related information about an interface.
Router# show ip		mcache [group-address group-name]	Displays the contents of the IP fast-switching cache.
[source-address		source-name]
Router# show ip		mpacket [group-address group-name]	Displays the contents of the circular cache header buffer.
[source-address		source-name] [detail]
Router# show ip		mroute [group-address group-name]	Displays the contents of the IP multicast routing table.
[source-address source-name] [type number] [summary]
[count] [active kbps]
Router# show ip pim interface [type number] [df			Displays information about interfaces configured for PIM.
count] [rp-address] [detail]
	Cisco IOS IP Configuration Guide

IPC-446