Challenges for the Internet Routing Infrastructure Introduced by Changes in Address Semantics
draft-king-irtf-challenges-in-routing-01

Document Type Active Internet-Draft (individual)
Authors Daniel King  , Joanna Dang  , Adrian Farrel 
Last updated 2021-02-22
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IRTF                                                             D. King
Internet-Draft                                      Lancaster University
Intended status: Informational                                   J. Dang
Expires: August 26, 2021                             Huawei Technologies
                                                               A. Farrel
                                                      Old Dog Consulting
                                                       February 22, 2021

Challenges for the Internet Routing Infrastructure Introduced by Changes
                          in Address Semantics
                draft-king-irtf-challenges-in-routing-01

Abstract

   Historically, the meaning of an IP address has been to identify an
   interface on a network device.  Routing protocols have been developed
   based on the assumption that a destination address has this semantic.

   Many proposals have been made to add semantics to IP addresses.
   These proposals may set the meaning of an address within the scope of
   a limited domain, or suggest an address semantic that is meaningful
   at specific points in the network (such as the source and
   destination), and ideally can continue to be used without special
   interpretation at transit points.

   This document presents a brief survey of technologies related to IP
   address semantic proposals and describes the challenges to the
   existing routing system that they present.  It then summarizes the
   opportunities for research into new or modified routing protocols to
   make use of new address semantics.  It does not pass comment on the
   advisability or practicality of any of the solutions.

   This document is presented as study to support further research into
   clarifying and understanding the issues without directly proposing
   technical solutions that are ready for productization, deployment, or
   standardization.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

King, et al.             Expires August 26, 2021                [Page 1]
Internet-Draft             Routing Challenges              February 2021

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
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   This Internet-Draft will expire on August 26, 2021.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Current Challenges to Internet Routing  . . . . . . . . . . .   5
   3.  Network Path Selection  . . . . . . . . . . . . . . . . . . .   6
     3.1.  Path Aware Routing  . . . . . . . . . . . . . . . . . . .   7
   4.  What is Semantic Routing? . . . . . . . . . . . . . . . . . .   8
     4.1.  Architectural Considerations  . . . . . . . . . . . . . .  11
       4.1.1.  Semantic Prefix Domains . . . . . . . . . . . . . . .  11
   5.  Existing Approaches for Routing Based on Additional Semantics  12
     5.1.  Non-Address-Based Routing . . . . . . . . . . . . . . . .  12
       5.1.1.  Deep Packet Inspection  . . . . . . . . . . . . . . .  13
       5.1.2.  Differentiated Services . . . . . . . . . . . . . . .  13
       5.1.3.  IPv6 Extension Headers  . . . . . . . . . . . . . . .  13
     5.2.  Semantic Overlays . . . . . . . . . . . . . . . . . . . .  14
       5.2.1.  Application-Layer Traffic Optimization  . . . . . . .  14
       5.2.2.  Multipath TCP . . . . . . . . . . . . . . . . . . . .  14
       5.2.3.  Service Function Chaining . . . . . . . . . . . . . .  15
       5.2.4.  Path Computation Element  . . . . . . . . . . . . . .  15
     5.3.  Semantic Addressing . . . . . . . . . . . . . . . . . . .  15
       5.3.1.  Locator/ID Separation Protocol (LISP) . . . . . . . .  15
       5.3.2.  Identifier-Locator Network Protocol . . . . . . . . .  16
       5.3.3.  Segment Routing . . . . . . . . . . . . . . . . . . .  16
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