RFC 995 December 1986 Contents 1 Introduction 5 2 Scope and Field of Application 6 3 References 7 SECTION ONE. GENERAL 9 4 Definitions 9 4.1 Reference Model Definitions . . . . . . . . . . . . . . . . . 9 4.2 Network Layer Architecture Definitions . . . . . . . . . . . 9 4.3 Network Layer Addressing Definitions . . . . . . . . . . . . 9 4.4 Local Area Network Definitions . . . . . . . . . . . . . . . 10 4.5 Additional Definitions . . . . . . . . . . . . . . . . . . . . 10 5 Symbols and Abbreviations 10 5.1 Data Units . . . . . . . . . . . . . . . . . . . . . . . . . 10 5.2 Protocol Data Units . . . . . . . . . . . . . . . . . . . . . 10 5.3 Protocol Data Unit Fields . . . . . . . . . . . . . . . . . . 10 5.4 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.5 Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . 11 6 Overview of the Protocol 11 6.1 Information Provided by the Protocol . . . . . . . . . . . . . 11 6.2 Subsets of the Protocol. . . . . . . . . . . . . . . . . . . . 12 6.3 Addressing . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.4 Underlying Service Assumed by the Protocol . . . . . . . . . 12 6.4.1 Subnetwork Addresses . . . . . . . . . . . . . . . . . 12 6.4.2 Subnetwork User Data . . . . . . . . . . . . . . . . . 13 6.5 Service Assumed from Local Environment . . . . . . . . . . . . 13 6.6 Subnetwork Types . . . . . . . . . . . . . . . . . . . . . . . 14 6.6.1 Point-to-Point Subnetworks . . . . . . . . . . . . . . 15 6.6.2 Broadcast Subnetworks . . . . . . . . . . . . . . . . 15 6.6.3 General Topology Subnetworks . . . . . . . . . . . . . 16 SECTION TWO. SPECIFICATION OF THE PROTOCOL 18 7 Protocol Functions 18 7.1 Protocol Timers . . . . . . . . . . . . . . . . . . . . . . . 18 7.1.1 Configuration Timer . . . . . . . . . . . . . . . . . 18 7.1.2 Holding Timer . . . . . . . . . . . . . . . . . . . . 18 7.2 Report Configuration Function . . . . . . . . . . . . . . . . 18 7.2.1 Report Configuration by End Systems . . . . . . . . . 19 7.2.2 Report Configuration by Intermediate Systems . . . . . 19 7.3 Record Configuration Function . . . . . . . . . . . . . . . . 20 7.4 Flush Old Configuration Function . . . . . . . . . . . . . . 20 7.5 Query Configuration Function . . . . . . . . . . . . . . . . . 20 ISO N4053