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Configuring IP Multicast Routing
Monitoring and Maintaining IP Multicast Routing Configuration Task List
IPC-446
Cisco IOS IP Configuration Guide
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:
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# clear ip cgmp
Clears all group entries the Catalyst switches have cached.
Router# clear ip igmp group [group-name |
group-address | type number]
Deletes entries from the IGMP cache.
Router# clear ip mroute {* | group-name
[source-name | source-address] | group-address
[source-name | source-address]}
Deletes entries from the IP multicast routing table.
Router# clear ip pim auto-rp rp-address
Clears the Auto-RP cache.
Router# clear ip rtp header-compression [type
number]
Clears RTP header compression structures and statistics.
Router# clear ip sap [group-address |
“session-name”]
Deletes the SAP cache or a SAP cache entry. The session name
is enclosed in quotation marks (“ ”) that the user must enter.
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
[interface
type number]
Displays Frame Relay RTP header compression statistics.
Router# show ip igmp groups [group-name |
group-address | type number] [detail]
Displays the multicast groups that are directly connected to
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]
[source-address | source-name]
Displays the contents of the IP fast-switching cache.
Router# show ip mpacket [group-address | group-name]
[source-address | source-name] [detail]
Displays the contents of the circular cache header buffer.
Router# show ip mroute [group-address | group-name]
[source-address | source-name] [type number] [summary]
[count] [active
kbps]
Displays the contents of the IP multicast routing table.
Router# show ip pim interface [type number] [df |
count] [rp-address] [detail]
Displays information about interfaces configured for PIM.