Defines the traffic priority level of all the
incoming packets on this VC.
FRSW_VCPRIORITY_DEFAULT - Set all incoming user
traffic packets to the default priority used by the port.
FRSW_VCPRIORITY_ONE - Set all incoming packets to priority 1.
FRSW_VCPRIORITY_TWO - Set all incoming packets to priority 2.
FRSW_VCPRIORITY_THREE - Set all incoming packets to priority 3.
Priority 0 is reserved for network critical packets like
OSPF, FR LMI and SMDS heartbeat and is not available for
user traffic.