The LLC2 entity represents the LLC2 protocol on the Peer Server
   and its accessibility by client applications. The LLC2 module
   controls the operation of the LLC Type 2 data link protocol for local
   area networks (LANs). The Peer Server supports a single instance of
   the LLC2 entity. The subordinate entities of the LLC2 entity are the
   Port and the SAP (service access point). The Port subentity exists
   when an LLC2 connection is established to an adjacent link station.
   Ports are dynamically created and deleted as connections are made and
   broken. An instance of the SAP subentity must exist for each LLC2 port.
   The SAP subentity is the access point to the underlying LAN station.
   There is one SAP for each protocol on the LAN adapter. The SAP entity
   has the Link subentity, which represents a remote LAN station and its
   associated SAP.