mtu <VALUE>

no mtu


Sets the MTU (maximum transmission unit) for an interface. This defines the maximum size of a layer 2 (Ethernet) frame. Frames larger than the MTU (1500 bytes by default) are dropped and cause an ICMP fragmentation-needed message to be sent back to the originator.

To support jumbo frames (frames larger than 1522 bytes), increase the MTU as required by your network. A frame size of up to 9198 bytes is supported.

The largest possible layer 1 frame will be 18 bytes larger than the MTU value to allow for link layer headers and trailers.

The no form of this command sets the MTU to the default value 1500.

Command context




Specifies the MTU in bytes. Range: 46 to 9198. Default: 1500.


Administrators or local user group members with execution rights for this command.


On the 6400 Switch Series, interface identification differs.

Setting the MTU on interface 1/1/1 to 1000 bytes:

Setting the MTU on interface 1/1/1 to the default value: