When PfgType is pfg-groups the forwarding policies between the groups can be
configured. Each PFG Group A,B,C or D can define the set of PFG-groups that
it can forward to (including itself). If a forward-to-x bit is not set for a
PFG-group, the PFG-group cannot forward to any interface e.g. flow-point) in
that PFG-group. Each interface defines which PFG-group it belongs to.
pfg-profile-ref
leafref
This type is used by the data models that need to reference
configured Private Forwarding Group Profiles.