Cisco Catalyst 3750 Metro Command Reference Manual page 764

system mtu
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 Command
mpls mtu
show interface interface-id
mtu
show system mtu
Catalyst 3750 Metro Switch Command Reference
2-736
Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
Description
Sets the MTU for MPLS labeled packets. The range is from 64 to 65536
bytes.
Displays the MTU setting on the specified interface.
Displays the maximum packet size set for Fast Ethernet ports, Gigabit
Ethernet ports, and routed ports.
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