Specifications

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Cisco ME 2400 Ethernet Access Switch Command Reference
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Chapter 2 Cisco ME 2400 Ethernet Access Switch Cisco IOS Commands
system mtu
system mtu
Use the system mtu global configuration command to set the maximum packet size or maximum
transmission unit (MTU) size for Gigabit Ethernet ports or for Fast Ethernet (10/100) ports. Use the no
form of this command to restore the global MTU value to its default value.
system mtu {bytes | jumbo bytes | routing bytes}
no system mtu
Note Though visible in the command line help, the routing keyword is not supported.
Syntax Description
Defaults The default MTU size for all ports is 1500 bytes.
Command Modes Global configuration
Command History
Usage Guidelines
Note When you use this command to change the system MTU or jumbo MTU size, you must reset the switch
before the new configuration takes effect.The system MTU setting is saved in the switch environmental
variable in NVRAM and becomes effective when the switch reloads. The MTU settings you enter with
the system mtu and system mtu jumbo commands are not saved in the switch IOS configuration file,
even if you enter the copy running-config startup-config privileged EXEC command. Therefore, if you
use TFTP to configure a new switch by using a backup configuration file and want the system MTU to
be other than the default, you must explicitly configure the system mtu and system mtu jumbo settings
on the new switch and then reload the switch.
Gigabit Ethernet ports operating at 1000 Mbps are not affected by the system mtu command, and
10/100-Mbps ports are not affected by the system mtu jumbo command.
If you enter a value that is outside the range for the specific type of switch, the value is not accepted.
bytes Set the system MTU for ports that are set to 10 or 100 Mbps. The range is
1500 to 1998 bytes. This is the maximum MTU received at 10/100-Mbps
Ethernet switch ports.
jumbo bytes Set the system jumbo frame size (MTU) for Gigabit Ethernet ports. The
range is 1500 to 9000 bytes. This is the maximum MTU received at the
physical port for Gigabit Ethernet ports.
Release Modification
12.2(25)EX This command was introduced.
12.2(25)SEG The system mtu
bytes range was changed to 1500 to 1998.