MULTIDROP_PRIMARY_SERVER

Required? Yes
Keyword Type Boolean
Default 0
Multiples Allowed? No, only one for each PORT_SDLC_SPECIFIC_DATA parameter
   MULTIDROP_PRIMARY_SERVER = (
      @TYPE = BOOLEANKEYWORD
      @REQUIRED = 1
      @DEFAULT = 0
    )
The MULTIDROP_PRIMARY_SERVER parameter specifies whether this server is a multidrop primary server. Valid values are:
0
This server is not a multidrop primary server.
1
This server is a multidrop primary server.

This parameter is required. The default is 0.

A multidrop primary server allows an SNA node (Gateway, Network and HPR node) to support multiple SDLC secondary PUs with one physical leased line. This support helps to minimize operating costs by reducing the number of lines and hardware required to connect to downstream PUs. The support requires the use of multidrop modems with a configuration of one main and multiple contextual. The primary must be set to use constant RTS while the secondaries must use switched RTS. A modified round robin polling algorithm is used. The polling algorithm consists of an active list (stations which responded to a poll) and an inactive list. Stations from the active list are polled round robin a user-specified number of times before a station is polled from the inactive list. Stations are rotated on the inactive list after each unsuccessful poll.