mtu

This command configures the interface Maximum Transmission Unit (MTU) on the specified tunnel interface.

Syntax

mtu auto
mtu <mtu value> 

Command	Description
auto	Sets MTU automatically.
mtu value	Sets MTU value. Range is between 68 and 1500.

Default

By default, MTU is set to auto (usually 1476).

Command Mode

Privileged User

Example

This example sets the MTU value to 770 bytes on GRE 6.

# configure data
(config-data)# interface gre 6
(conf-if-GRE 6)# mtu 770