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Configuring the Media MTU on Frame Relay Interfaces
For Frame Relay interfaces, the default media maximum transmission unit (MTU) is 4482 bytes. (For a complete list of MTU values, see Configuring the Media MTU.)
To modify the default media MTU size for a physical interface, include the mtu statement at the [edit interfaces interface-name] hierarchy level:
[edit interfaces interface-name]mtu bytes;
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 can include 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 with Frame Relay Encapsulation.
