Monitoring And Maintaining Ip Addressing - Cisco Catalyst 3120 Software Manual

Configuring IP Addressing
Beginning in privileged EXEC mode, follow these steps to use the bridging spanning-tree database to
flood UDP datagrams:
Command
Step 1 configure terminal
Step 2
ip forward-protocol spanning-tree
Step 3
end
Step 4 show running-config
Step 5
copy running-config startup-config
Use the no ip forward-protocol spanning-tree global configuration command to disable the flooding
of IP broadcasts.
In the switch, the majority of packets are forwarded in hardware; most packets do not go through the
switch CPU. For those packets that do go to the CPU, you can speed up spanning tree-based UDP
flooding by a factor of about four to five times by using turbo-flooding. This feature is supported over
Ethernet interfaces configured for ARP encapsulation.
Beginning in privileged EXEC mode, follow these steps to increase spanning-tree-based flooding:
Command
Step 1 configure terminal
Step 2
ip forward-protocol turbo-flood
Step 3
end
Step 4
show running-config
Step 5 copy running-config startup-config
To disable this feature, use the no ip forward-protocol turbo-flood global configuration command.

Monitoring and Maintaining IP Addressing

When the contents of a particular cache, table, or database have become or are suspected to be invalid,
you can remove all its contents by using the clear privileged EXEC commands.
commands for clearing contents.
Table 38-2 Commands to Clear Caches, Tables, and Databases
Command
clear arp-cache
clear host {name | *}
clear ip route {network [mask] |*}
You can display specific statistics, such as the contents of IP routing tables, caches, and databases; the
reachability of nodes; and the routing path that packets are taking through the network.
the privileged EXEC commands for displaying IP statistics.
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
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Purpose
Enter global configuration mode.
Use the bridging spanning-tree database to flood UDP datagrams.
Return to privileged EXEC mode.
Verify your entry.
(Optional) Save your entry in the configuration file.
Purpose
Enter global configuration mode
Use the spanning-tree database to speed up flooding of UDP datagrams.
Return to privileged EXEC mode.
Verify your entry.
(Optional) Save your entry in the configuration file.
Purpose
Clear the IP ARP cache and the fast-switching cache.
Remove one or all entries from the hostname and the address cache.
Remove one or more routes from the IP routing table.
Chapter 38 Configuring IP Unicast Routing
Table 38-2 lists the
Table 38-3
OL-12247-01
lists