RFC 1668 (rfc1668) - Page 1 of 3

Unified Routing Requirements for IPng

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Network Working Group                                          D. Estrin
Request for Comments: 1668                                           USC
Category: Informational                                            T. Li
                                                           Cisco Systems
                                                              Y. Rekhter
                                  T.J. Watson Research Center, IBM Corp.
                                                             August 1994


                 Unified Routing Requirements for IPng

Status of this Memo

   This memo provides information for the Internet community.  This memo
   does not specify an Internet standard of any kind.  Distribution of
   this memo is unlimited.

Abstract

   This document was submitted to the IETF IPng area in response to RFC
   1550.  Publication of this document does not imply acceptance by the
   IPng area of any ideas expressed within.  Comments should be
   submitted to the  mailing list.

1. IPng Requirements

   The following list provides requirements on the IPng from the
   perspective of the Unified Routing Architecture, as describe in RFC
   1322.

   1. To provide scalable routing, IPng addressing must provide support
      for topologically significant address assignment.

   2. Since it is hard to predict how routing information will be
      aggregated, the IPng addressing structure should impose as few
      preconditions as possible on the number of levels in the hierarchy.
      Specifically, the number of levels must be allowed to be different
      at different parts in the hierarchy. Further, the levels must not
      be statically tied to particular parts (fields) in the addressing
      information.

   3. Hop-by-hop forwarding algorithm requires IPng to carry enough
      information in the Network Layer header to unambiguously determine
      a particular next hop. Unless mechanisms to compute
      context-sensitive forwarding tables and provide consistent
      forwarding are defined, the requirement assumes the presence of
      full hierarchical addresses.  Therefore, IPng packet format must
      provide efficient determination of the full hierarchical



Estrin, Li & Rekhter
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