Cisco ME 3400 Command Reference Manual page 725

Ethernet access switch

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Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands

For example, if the system mtu value is 1998 bytes and the system mtu jumbo value is 5000 bytes,

packets up to 5000 bytes can be received on interfaces operating at 1000 Mb/s. However, although a

packet larger than 1998 bytes can be received on an interface operating at 1000 Mb/s, if its destination

interface is operating at 10 or 100 Mb/s, the packet is dropped.

This example shows how to set the maximum packet size for Gigabit Ethernet ports to 1800 bytes:

Switch(config)# system mtu jumbo 1800

Switch(config)# exit

Switch# reload

This example shows how to set the maximum packet size for Gigabit Ethernet ports to 1800 bytes, to

define an alternate MTU size of 1700 bytes and apply it to Gigabit Ethernet port 0/8. Changes are not

applied until you reload the switch:

Switch(config)# system mtu jumbo 1800

Switch(config)# system mtu alternate 1700

Changes to the Alternate MTU will not take effect until the next reload is done

Switch(config)# system mtu alternate interface gigabitethernet 0/8

Changes to the Alternate MTU on interface will not take effect until the next re

load is done

Switch(config)# exit

Switch# reload

This example shows how to apply the alternate MTU to Gigabit Ethernet interfaces 1 to 10. Changes are

not applied until you reload the switch:

Switch(config)# system mtu alternate interface range gigabitethernet 0/1-10

Changes to the Alternate MTU on interface(s) will not take effect until the next reload is done

Switch(config)# exit

You can verify your setting by entering the show system mtu or show interface interface-id mtu

privileged EXEC command.

Related Commands

show interface interface-id mtu

show system mtu

Displays the MTU setting on the specified interface.

Displays the packet size set for Fast Ethernet and Gigabit

Ethernet ports.

Cisco ME 3400 Ethernet Access Switch Command Reference