9-20
Catalyst 3750 Metro Switch Software Configuration Guide
78-15870-01
Chapter 9 Configuring Interface Characteristics
Monitoring and Maintaining the Interfaces
Beginning in privileged EXEC mode, follow these steps to change MTU size for all 10/100 or Gigabit
Ethernet interfaces:
If you enter a value that is outside the allowed range for the specific type of interface, the value is not
accepted.
Once the switch reloads, you can verify your settings by entering the show system mtu privileged EXEC
command.
This example shows how to set the maximum packet size for Gigabit Ethernet interfaces to 1800 bytes:
Switch(config)# system jumbo mtu 1800
Switch(config)# exit
Switch# reload
This example shows the response when you try to set Gigabit Ethernet interfaces to an out-of-range
number:
Switch(config)# system mtu jumbo 2500
^
% Invalid input detected at '^' marker.
Monitoring and Maintaining the Interfaces
You can perform the tasks in these sections to monitor and maintain interfaces:
• Monitoring Interface Status, page 9-20
• Clearing and Resetting Interfaces and Counters, page 9-21
• Shutting Down and Restarting the Interface, page 9-22
Monitoring Interface Status
Commands entered at the privileged EXEC prompt display information about the interface, including
the versions of the software and the hardware, the configuration, and statistics about the interfaces.
Table 9-3 lists some of these interface monitoring commands. (You can display the full list of show
commands by using the show ? command at the privileged EXEC prompt.) These commands are fully
described in the Cisco IOS Interface Command Reference for Release 12.1.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
system mtu bytes (Optional) Change the MTU size for all interfaces on
the switch that are operating at 10 or 100 Mbps. The
range is from 1500 to 1546 bytes; the default is 1500
bytes.
Step 3
system mtu jumbo bytes (Optional) Change the MTU size for all Gigabit
Ethernet interfaces on the switch. The range is from
1500 to 9000 bytes; the default is 1500 bytes.
Step 4
end Return to privileged EXEC mode.
Step 5
copy running-config startup-config Save your entries in the configuration file.
Step 6
reload Reload the operating system.
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