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Cisco ME 3400 Ethernet Access Switch Command Reference
OL-9640-10
Chapter 2 Cisco ME 3400 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 or to set an
alternate MTU for specific ports. Use the no form of this command to restore the global MTU value to
its default value.
system mtu {bytes | alternate {bytes | interface interface-id} | 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 Mb/s. The range is
1500 to 1998 bytes. The default is 1500 bytes. This is the maximum MTU
received at 10/100-Mb/s Ethernet switch ports.
alternate bytes Define an alternate frame size (MTU) to be applied to specific interfaces.
The range is between the configured system MTU and the configured jumbo
MTU size (1500 to 9000 bytes). The default is 1500 bytes.
alternate interface
{interface-id | range
interface-range}
Apply the alternate MTU to the specified interface or range of interfaces.
jumbo bytes Set the system jumbo frame size (MTU) for Gigabit Ethernet ports. The
range is 1500 to 9000 bytes. The default is 1500 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.
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