Understanding Interface Sets
Although the interface set is applied at the [edit interfaces] hierarchy level, the CoS parameters for the interface set are defined
at the [edit class-of-service interfaces] hierarchy level,
usually with the output-traffic-control-profile profile-name statement.
This example applies a traffic control profile called tcp-set1 to an interface set called set-ge-0:
[edit class-of-service interfaces]
interface-set set-ge-0 {
output-traffic-control-profile tcp-set1;
}