Network Working Group R. Ullmann Request for Comments: 1476 Process Software Corporation June 1993 RAP: Internet Route Access Protocol Status of this Memo This memo defines an Experimental Protocol for the Internet community. It does not specify an Internet standard. Discussion and suggestions for improvement are requested. Please refer to the current edition of the "IAB Official Protocol Standards" for the standardization state and status of this protocol. Distribution of this memo is unlimited. Abstract This RFC describes an open distance vector routing protocol for use at all levels of the internet, from isolated LANs to the major routers of an international commercial network provider. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . 2 1.1 Link-State and Distance-Vector . . . . . . . . . . 3 1.2 Terminology . . . . . . . . . . . . . . . . . . . 3 1.3 Philosophy . . . . . . . . . . . . . . . . . . . . 3 2. RAP Protocol . . . . . . . . . . . . . . . . . . . 4 2.1 Command Header Format . . . . . . . . . . . . . . 4 2.1.1 Length field . . . . . . . . . . . . . . . . . . . 4 2.1.2 RAP version . . . . . . . . . . . . . . . . . . . 5 2.2 RAP Commands . . . . . . . . . . . . . . . . . . . 5 2.2.1 No operation . . . . . . . . . . . . . . . . . . . 5 2.2.2 Poll . . . . . . . . . . . . . . . . . . . . . . . 6 2.2.3 Error . . . . . . . . . . . . . . . . . . . . . . 7 2.2.4 Add Route . . . . . . . . . . . . . . . . . . . . 8 2.2.5 Purge Route . . . . . . . . . . . . . . . . . . . 9 3. Attributes of Routes . . . . . . . . . . . . . . . 9 3.1 Metric and Option Format . . . . . . . . . . . . .10 3.1.1 Option Class . . . . . . . . . . . . . . . . . . 10 3.1.2 Type . . . . . . . . . . . . . . . . . . . . . . 10 3.1.3 Format . . . . . . . . . . . . . . . . . . . . . 11 3.2 Metrics and Options . . . . . . . . . . . . . . 11 3.2.1 Distance . . . . . . . . . . . . . . . . . . . . 12 3.2.2 Delay . . . . . . . . . . . . . . . . . . . . . 12 3.2.3 MTU . . . . . . . . . . . . . . . . . . . . . . 12 3.2.4 Bandwidth . . . . . . . . . . . . . . . . . . . 12 Ullmann