Configuring the Media MTU on SONET/SDH Interfaces

The default media MTU size used on a physical interface depends on the encapsulation being used on that interface. For a listing of MTU sizes for each encapsulation type, see Configuring the Media MTU. For information about configuring the encapsulation on an interface, see Configuring Interface Encapsulation on SONET/SDH Interfaces.

To modify the default media MTU size for a physical interface, include the mtu statement at the [edit interfaces interface-name] hierarchy level:

If you change the size of the media MTU, you must ensure that the size is equal to or greater than the sum of the protocol MTU and the encapsulation overhead. You configure the protocol MTU by including the mtu statement at the following hierarchy levels:

• [edit interfaces interface-name unit logical-unit-number family family]
• [edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number family family]

For more information, see Setting the Protocol MTU.