Information About the MTU
The default maximum transmission unit (MTU) size for frames received and sent on all switch interfaces is 1500 bytes.
You can change the MTU size to support switched jumbo frames on all Gigabit Ethernet and 10-Gigabit Ethernet interfaces and to support routed frames on all routed ports.
Restrictions for System MTU
When configuring the system MTU values, follow these guidelines:
The switch does not support the MTU on a per-interface basis.
If you enter the system mtu bytes global configuration command, the command does not take effect on the switch. This command only affects the system MTU size on Fast Ethernet switch ports.