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Catalyst 2350 Switch Command Reference
OL-19055-01
Chapter 2 Catalyst 2350 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 (10/100/1000) ports, or for 10-Gigabit ports, or for
routed ports. Use the
no
form of this command to restore the global MTU value to its default value
system mtu
{
bytes |
jumbo
bytes
}
no system mtu
[
jumbo
]
Syntax Description
Defaults
The default MTU size for all ports is 1500 bytes.
The default value for the system routing MTU is the system MTU value.
Command Modes
Global configuration
Command History
Usage Guidelines
The switch does not support the MTU on a per-interface basis.
If you enter the
system
mtu
bytes
global configuration command or the
system mtu routing
command
on the switch, the commands have no effect.
When you use the
system
mtu jumbo
bytes
command to change the system 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 that you enter with the
system mtu jumbo
command are not saved in the switch Cisco 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 jumbo
settings on the new switch and then reload the
switch.
bytes
Change the MTU size for all Fast Ethernet interfaces.
Note
This value does not apply to the Catalyst 2350 switch.
jumbo
bytes
Set the system MTU for Gigabit Ethernet ports and 10-Gigabit Ethernet
ports. The system jumbo MTU is the maximum MTU received at the Gigabit
Ethernet and 10-Gigabit Ethernet ports.
The range is from 1500 to 9198 bytes.
Release
Modification
12.2(46)EY
This command was introduced.
