Default Ethernet MTU

The Maximum Transmission Unit (MTU) can be set on interfaces individually, and a common default value can be set in the dataplane as well. Setting the default value allows interfaces to use the proper MTU for the environment without using a manually configured value on every interface.

The dataplane ethernet default-mtu <size> command sets the default MTU for Ethernet interfaces, in bytes. Valid values are from 64 to 9000.

Warning

Any interface that will contain an IPv6 address must have an MTU of 1280 or higher. This includes both the default MTU and MTU values set on interfaces directly.

See also

See Interface Configuration Options for information on setting the MTU on an interface directly.