Introduction to DLPI
DLPI Services
DL_PROMISCOFF_REQ requests the DLS provider to disable promiscuous mode on a per stream basis, either at the physical level of at the SAP level. The provider indicates success with a DL_OK_ACK message and failure with a DL_ERROR_ACK message.
The normal message sequence is illustrated in Figure
Figure 1-11 Message Flow: Disabling Promiscuous Mode on a Stream
DL_PROMISCOFF request 
DL_OK acknowledge
Connection-mode Services
The
Connection Establishment Service
The connection establishment service establishes a data link connection between a local DLS user and a remote DLS user for the purpose of sending data. Only one data link connection is allowed on each stream.
Normal Connection Establishment. In the connection establishment model, the calling DLS user initiates connection establishment, while the called DLS user waits for incoming requests. DL_CONNECT_REQ requests that the DLS provider establish a connection. DL_CONNECT_IND informs the called DLS user of the request, which may be accepted using DL_CONNECT_RES. DL_CONNECT_CON informs the calling DLS user that the connection has been established.
The normal sequence of messages is illustrated in Figure
Chapter 1 | 35 |