Network Working Group S. Kille Request for Comments: 1801 ISODE Consortium Category: Experimental June 1995 X.400-MHS use of the X.500 Directory to support X.400-MHS Routing Status of this Memo This memo defines an Experimental Protocol for the Internet community. This memo does not specify an Internet standard of any kind. Discussion and suggestions for improvement are requested. Distribution of this memo is unlimited. Table of Contents 1 Introduction 3 2 Goals 3 3 Approach 5 4 Direct vs Indirect Connection 6 5 X.400 and RFC 822 8 6 Objects 9 7 Communities 10 8 Routing Trees 11 8.1 Routing Tree Definition . . . . . . . 12 8.2 The Open Community Routing Tree . . . . . 12 8.3 Routing Tree Location . . . . . . . 13 8.4 Example Routing Trees . . . . . . . 13 8.5 Use of Routing Trees to look up Information . . 13 9 Routing Tree Selection 14 9.1 Routing Tree Order . . . . . . . . 14 9.2 Example use of Routing Trees . . . . . . 15 9.2.1 Fully Open Organisation . . . . . 15 9.2.2 Open Organisation with Fallback . . . 15 9.2.3 Minimal-routing MTA . . . . . . 16 9.2.4 Organisation with Firewall . . . . . 16 9.2.5 Well Known Entry Points . . . . . 16 9.2.6 ADMD using the Open Community for Advertising 16 9.2.7 ADMD/PRMD gateway . . . . . . . 17 10 Routing Information 17 10.1 Multiple routing trees . . . . . . . 20 10.2 MTA Choice . . . . . . . . . . 22 10.3 Routing Filters . . . . . . . . . 25 10.4 Indirect Connectivity . . . . . . . 26 11 Local Addresses (UAs) 27 11.1 Searching for Local Users . . . . . . 30 12 Direct Lookup 30 13 Alternate Routes 30 Kille Experimental