Specifications

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Cisco ME 3400 Ethernet Access Switch Command Reference

OL-9640-07

Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands

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 supported only when the switch is

running the metro IP access image.

Syntax Description

Defaults The default MTU size for all ports is 1500 bytes. However, if you configure a different value for the

system MTU, that configured value becomes the default MTU size for routed ports when it is applied

following a switch reset.

Command Modes Global configuration

Command History

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.

routing bytes Set the maximum MTU for routed packets. You can also set the maximum

MTU to be advertised by the routing protocols that support the configured

MTU size. The range is 1500 bytes to the system MTU value. The system

routing MTU is the maximum MTU for routed packets and is also the

maximum MTU that the switch advertises in routing updates for protocols

such as OSPF.

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. The routing

bytes keywords were added.