H.1.4.1.4 Interaction Diagram

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Figure H.1-4 Select LDAP Server

The DNS client shall request a list of all the LDAP servers available. It will use the priority, capacity, and location information provided by DNS to select a server. (RFC-2782 recommends the proper use of these parameters.) It is possible that there is no LDAP server, or that the DNS server does not support the SRV RR request.

Notes: 1. Multiple LDAP servers providing access to a common replicated LDAP database is a commonly supported configuration. This permits LDAP servers to be located where appropriate for best performance and fault tolerance. The DNS server response information provides guidance for selecting the most appropriate server.

2. There may also be multiple LDAP servers providing different databases. In this situation the client may have to examine several servers to find the one that supports the DICOM configuration database. Similarly a single LDAP server may support multiple base DNs, and the client will need to check each of these DNs to determine which is the DICOM supporting tree.