RFC 1992 (rfc1992) - Page 2 of 27

The Nimrod Routing Architecture

RFC 1992              Nimrod Routing Architecture            August 1996


       3.5.4 Inbound Connectivity . . . . . . . . . . . . . . . . . . 12
       3.5.5 Outbound Connectivity  . . . . . . . . . . . . . . . . . 12
   4. Physical Realization  . . . . . . . . . . . . . . . . . . . . . 13
     4.1 Contiguity   . . . . . . . . . . . . . . . . . . . . . . . . 13
     4.2 An Example . . . . . . . . . . . . . . . . . . . . . . . . . 14
     4.3 Multiple Locator Assignment  . . . . . . . . . . . . . . . . 15
   5. Forwarding  . . . . . . . . . . . . . . . . . . . . . . . . . . 20
     5.1 Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
     5.2 Trust  . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
     5.3 Connectivity Specification (CSC) Mode  . . . . . . . . . . . 24
     5.4 Flow Mode  . . . . . . . . . . . . . . . . . . . . . . . . . 25
     5.5 Datagram Mode  . . . . . . . . . . . . . . . . . . . . . . . 25
     5.6 Connectivity Specification Sequence Mode . . . . . . . . . . 26
   6. Security Considerations . . . . . . . . . . . . . . . . . . . . 26
   7. References  . . . . . . . . . . . . . . . . . . . . . . . . . . 26
   7. Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . 27

1. Introduction

   Nimrod is a scalable routing architecture designed to accommodate a
   continually expanding and diversifying internetwork.  First suggested
   by Noel Chiappa, the Nimrod architecture has undergone revision and
   refinement through the efforts of the Nimrod working group of the
   IETF. In this document, we present a detailed description of this
   architecture.

   The goals of Nimrod are as follows:

   1. To support a dynamic internetwork of arbitrary size by
      providing mechanisms to control the amount of routing information
      that must be known throughout an internetwork.

   2. To provide service-specific routing in the presence of multiple
      constraints imposed by service providers and users.

   3. To admit incremental deployment throughout an internetwork.

   We have designed the Nimrod architecture to meet these goals.  The
   key features of this architecture include:

   1. Representation of internetwork connectivity and services in the
      form of maps at multiple levels of abstraction.

   2. User-controlled route generation and selection based on maps and
      traffic service requirements.

   3. User-directed packet forwarding along established paths.




Castineyra, et. al.          Informational