Cisco WS-C3560E-48PD-SF Command Reference - Page 685
system mtu, Mbps or greater. The range is 1500 to 9000 bytes. This is the maximum MTU
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Chapter 2 Catalyst 3560 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, for routed 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 Syntax Description bytes jumbo bytes routing 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. Set the system jumbo MTU for Gigabit Ethernet ports operating at 1000 Mbps or greater. The range is 1500 to 9000 bytes. This is the maximum MTU received at the physical port for Gigabit Ethernet ports. 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. 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 Release 12.1(19)EA1 12.2(25)SEC 12.2(25)SED Modification This command was introduced. The bytes range is now 1500 to 1998. The routing bytes keywords were added. Usage Guidelines 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 routing command does not require a switch reset to take effect. 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. You can use the system mtu routing command to configure the MTU size on routed ports. 78-16405-05 Catalyst 3560 Switch Command Reference 2-653