This object defines the groups of user PRI mapped into
this VC. Each bit set indicates that this user priority
is assigned to this VC.
The value 'untagged' is used to indicate that untagged
frames are also associated to this VC.
This object allow the use of different PSN COS based on
user marking of PRI bits in MPLS PSN with L-LSP or
E-LSP without multiple COS support. In all other cases,
the default value MUST be used.
It is REQUIRED that there is no overlap on this object
between rows serving the same service (port+ PW VLAN).
In case of missing BIT configuration between rows to
the same service, incoming packets with PRI marking not
configured should be handled by the VC with the lowest
COS.