HP 800 HP DLPI Programmer's Guide - Page 48

Introduction to DLPI DLPI Services Figure 1-25 Figure 1-26 Figure 1-25 illustrates the message flow for a reset invoked by the DLS provider. Message Flow: DLS Provider-Invoked Connection Reset DL_RESET indication DL_RESET response DL_OK acknowledge DL_RESET indication DL_RESET response DL_OK acknowledge Figure 1-26 illustrates the message flow for a reset invoked simultaneously by one DLS user and the DLS provider. Message Flow: Simultaneous DLS User & DLS Provider-Invoked Connection Reset DL_RESET request DL_RESET indication DL_RESET confirm DL_RESET response DL_OK acknowledge Connectionless-mode Services The connectionless-mode services enable a DLS user to transfer units of data to peer DLS users without incurring the overhead of establishing and releasing a connection. The connectionless service does not, however, guarantee reliable delivery of data units between peer DLS users (for example, lack of flow control may cause buffer resource shortages that result in data being discarded). Once a stream has been initialized via the local management services, it may be used to send and retrieve connectionless data units. 48 Chapter 1