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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter24 Configuring IP Multicast Routing
Monitoring and Maintaining IP Multicas t Routing
Clearing Caches, Tables, and Databases
You can remove all contents of a particular cache, table, or database. Clearing a cache, table, or database
might be necessary when the contents of the particula r struc tur e are or susp ect ed t o be i n valid.
You can use any of the privileged EXEC commands in Table 24-3 to clear IP multicast caches, tables,
and databases:
Displaying System and Network Statistics
You can display specific statistics such as the contents of IP routing tables, caches, and databases. You
can display information to determine resource utilization and solve network problems. You can also
display information about node reachability and discover the routing path your device’s packets are
taking through the network.
You can use any of the privileged EXEC commands in Table 24-4 to display various routing statistic s:
Table24-3 Commands for Clearing Caches, Tables, and Databases
Command Purpose
clear ip cgmp Clear all group entries the Catalyst switches have
cached.
clear ip dvmrp route {* | route} Delete routes from the DVMRP routing table.
clear ip igmp group [group-name |
group-address | interface] Delete entries from the IGMP cache.
clear ip mroute {* | group [source]} Delete entries from the IP multicast routing table.
clear ip pim auto-rp rp-address Clear the Auto-RP cache.
clear ip sdr [group-address | “session-name”] Delete the Session Directory Protocol Version 2
cache or an sdr cache entry.
Table24-4 Commands for Displaying System and Network Statistics
Command Purpose
ping [group-name | group-address] Send an ICMP Echo Request to a multicast group
address.
show ip dvmrp route [ip-address] Display the entries in the DVMRP routing table.
show ip igmp groups [group-name |
group-address | type number] Display the multicast groups that are directly
connected to the multilayer switch and that were
learned through IGMP.
show ip igmp interface [type number] Display multicast-related information about an
interface.
show ip mcache [group [source]] Display the contents of the IP fast-switching
cache.switching, displaying
show ip mpacket [source-address | name]
[group-address | name] [detail]Display the contents of the circular cache-header
buffer.
show ip mroute [group-name | group-address]
[source] [summary] [count] [active kbps] Display the contents of the IP multicast routing
table.