The role of the VC in this interface. primary - the state of this VC determines the operStatus of the interface. For point to point interfaces, the agent will not permit more than one primary to exist. A sub interface for which no primary is defined will be down. priority6to7 - This VC handles high priority (forwarding class 6 to 7)traffic. If this VC does not exists, the sub interface will send all traffic through the primary VC (no priority-dlci-group) In point to point interfaces, only one such VC can be configured. priority4to5 - This VC handles Medium priority (forwarding class 4 to 5)traffic. If this VC does not exists, the sub interface will send all traffic through the primary VC (no priority-dlci-group) In point to point interfaces, only one such VC can be configured. priority2to3 - This VC handles Normal priority (forwarding class 2 to 3)traffic. If this VC does not exists, the sub interface will send all traffic through the primary VC (no priority-dlci-group) In point to point interfaces, only one such VC can be configured. priority0to1 - This VC handles Low priority (forwarding class 0 to 1)traffic. If this VC does not exists, the sub interface will send all traffic through the primary VC (no priority-dlci-group) In point to point interfaces, only one such VC can be configured.