HP 800 HP DLPI Programmer's Guide - Page 45

Figure 1-20 Figure 1-21 Figure 1-22 Introduction to DLPI DLPI Services DL_DISCONNECT_REQ requests that a connection be released. DL_DISCONNECT_IND informs the DLS user that a connection has been released. Normally, one DLS user requests disconnection and the DLS provider issues an indication of the ensuing release to the other DLS user, as illustrated by the message flow in Figure 1-20. Message Flow: DLS User-Invoked Connection Release DL_DISCONNECT request DL_OK acknowledge DL_DISCONNECT indication Figure 1-21 illustrates that when two DLS users independently invoke the connection release service, neither of them receives a DL_DISCONNECT_IND. Message Flow: Simultaneous DLS User Invoked Connection Release DL_DISCONNECT request DL_OK acknowledge DL_DISCONNECT request DL_OK acknowledge Figure 1-22 illustrates that when the DLS provider and the local DLS user simultaneously invoke the connection release service, the remote DLS user receives a DL_DISCONNECT_IND. Message Flow: Simultaneous DLS User & DLS Provider Invoked Connection Release DL_DISCONNECT request DL_OK acknowledge DL_DISCONNECT indication Chapter 1 45