VCs having the same terminals (PE devices) can be
combined in an OC when passing through optical networks.
Traffic grooming techniques [7,8] can be used in this case.
There are many forms of traffic grooming, such as planning of
VCs into an OC [9] or switching of a VC between OCs [10].
The objectives are to reduce the network using cost, to
optimize the used bandwidth and to ensure the QoS.