System MTU Guidelines
When configuring the system MTU values, follow these guidelines:
•
The default maximum transmission unit (MTU) size for frames received and transmitted on all interfaces
is 1500 bytes. You can increase the MTU size for all interfaces operating at 10 or 100 Mb/s by using
the system mtu global configuration command. You can increase the MTU size to support jumbo frames
on all Gigabit Ethernet interfaces by using the system mtu jumbo global configuration command.
•
Gigabit Ethernet ports are not affected by the system mtu command; 10/100 ports are not affected by
the system mtu jumbo command. If you do not configure the system mtu jumbo command, the setting
of the system mtu command applies to all Gigabit Ethernet interfaces.
How to Configure MTU
Configuring the System MTU
Beginning in privileged EXEC mode, follow these steps to change the MTU size for all 10/100 or Gigabit
Ethernet interfaces:
SUMMARY STEPS
1.
configure terminal
2.
system mtu bytes
3.
system mtu jumbo bytes
4.
end
5.
copy running-config startup-config
6.
reload
7.
show system mtu
DETAILED STEPS
PurposeCommand or Action
Enters global configuration mode.configure terminal
Example:
Switch# configure terminal
Step 1
(Optional) Change the MTU size for all interfaces on the
switch stack that are operating at 10 or 100 Mb/s.
system mtu bytes
Example:
Switch(config)# system mtu 2500
Step 2
The range is 1500 to 1998 bytes; the default is 1500 bytes.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
78
How to Configure MTU
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