Monitoring And Maintaining Ip Addressing - Cisco Catalyst 3750 Software Configuration Manual
Metro switch
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Also See for Catalyst 3750:
- Command reference manual (1154 pages) ,
- Hardware installation manual (231 pages) ,
- Message manual (120 pages)
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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 a Catalyst 3750 Metro 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 28-2 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.
Catalyst 3750 Metro Switch Software Configuration Guide
28-16
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 host name and the address cache.
Remove one or more routes from the IP routing table.
Chapter 28
Configuring IP Unicast Routing
Table 28-2
lists the
Table 28-3
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Table of Contents
Troubleshooting
