System Mtu - Cisco Catalyst 3750 Command Reference Manual

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system mtu

Use the system global configuration command on the switch stack or on a standalone switch 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

Syntax Description

The default MTU size for all ports is 1500 bytes.

Command Modes

Global configuration

Command History

Usage Guidelines

When you use this command to change the MTU size, you must reset the switch before the new

configuration takes effect.

Gigabit Ethernet ports are not affected by the system mtu command; Fast Ethernet 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.

The switch does not support setting the MTU on a per-interface basis.

The size of frames that can be received by the switch CPU is limited to 1500 bytes, no matter what value

was entered with the system mtu command. Although frames that are forwarded or routed typically are

not received by the CPU, in some cases packets are sent to the CPU, such as traffic sent to control traffic,

SNMP, Telnet, or routing protocols.

Catalyst 3750 Switch Command Reference

system mtu {bytes | jumbo bytes}

no system mtu

Set the system MTU for Fast Ethernet (10/100) ports. The range is 1500 to

Set the system jumbo frame size (MTU) for Gigabit Ethernet ports. The

range is 1500 to 9000 bytes.

Modification

This command was introduced.

Chapter 2 Catalyst 3750 Switch Cisco IOS Commands

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