Configure Aggregated SONET Link Speed
On aggregated SONET interfaces, you can set the required link speed for all interfaces included in the bundle. All interfaces that make up a bundle must be the same speed. If you include in the aggregated SONET interface an individual link that has a speed different from the speed you specify in the link-speed parameter, an error message will be logged.
To set the required link speed, include the link-speed statement at the [edit interfaces interface-name aggregated-sonet-options] hierarchy level:
[edit interfaces interface-name aggregated-sonet-options]
link-speed speed;