Configuring a layer 2 interface

Procedure
  1. Change to the interface configuration context for the interface with the command interface.
  2. Set the interface MTU (maximum transmission unit) with the command mtu.
  3. Review interface configuration settings with the command show interface.

Example

On the 6300 switch series: 
switch(config)# interface 1/1/1
switch(config-if)# mtu 1900
On the 6400 switch series: 
switch(config)# interface 1/3/1
switch(config-if)# mtu 1900