Cisco Catalyst 2960 Series, Configuration Manual

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Purpose Command or Action
(Optional) Changes the MTU size for all Gigabit Ethernet
interfaces on the switch or the switch stack. system mtu jumbo bytes
Example:
Switch(config)# system mtu jumbo 7500
Step 3
The range is 1500 to 9198 bytes; the default is 1500 bytes.
Returns to privileged EXEC mode. end
Example:
Switch(config)# end
Step 4
Saves your entries in the configuration file. copy running-config startup-config
Example:
Switch# copy running-config startup-config
Step 5
Reloads the operating system. reload
Example:
Switch# reload
Step 6
Verifies your settings. show system mtu
Example:
Switch# show system mtu
Step 7
Configuration Examples for System MTU
This example shows how to set the maximum packet size for a Gigabit Ethernet port to 7500 bytes:
Switch(config)#
system mtu 1900
Switch(config)# system mtu jumbo 7500
Switch(config)# exit
If you enter a value that is outside the allowed range for the specific type of interface, the value is not accepted.
This example shows the response when you try to set Gigabit Ethernet interfaces to an out-of-range number:
Switch(config)# system mtu jumbo 25000
^
% Invalid input detected at '^' marker.
This is an example of output from the show system mtu command:
Switch#
show system mtu
Global Ethernet MTU is 1500 bytes.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
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Configuration Examples for System MTU