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X.500 1993 implementations have been put through their paces in a series of interoperability tests run by DANTE as part of the preparation for its upcoming transition to 1993. The conclusion of these tests were that the various systems were still not ready for service deployment. Some of these problems were due to bugs in some of the new implementations. Some came about as a result of deficiencies in the standard itself. The most notable of these is the issue of management of the root context. The root context is the root entry plus the set of subordinate references to the first level entries, i.e. national master DSAs, countries and other global entities. At present the standard stipulates that each first level DSA gains a copy of the root naming context by setting up individual bilateral agreements with each DSA that masters data at the first level. This is problematic as the method results in too great a number of agreements to maintain. A proposal currently being considered is to set up a DSA that holds agreements with each DSA at the first level and keeps a copy of the entire root context. All other DSAs can then maintain copies of the root context by making a single agreement with this DSA. The exact details of the mechanism have yet to be pushed through the ISO and ITU standards bodies. Until this, and other problems, are fully resolved it will not be possible to build a fully X.500 1993 compliant international directory service. EuroView is co-operating with DANTE and other directory service providers to resolve the issue. As an interim measure, EuroView will use X.500 1988 Quipu DSAs to service the higher levels of the DIT.
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Title: EuroView Service Design
Issue: 1.1
Date: 17