Providing Instance Affinity in Dyncast
draft-bormann-dyncast-affinity-00

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dyncast                                                       C. Bormann
Internet-Draft                                    Universität Bremen TZI
Intended status: Informational                          22 February 2021
Expires: 26 August 2021

                 Providing Instance Affinity in Dyncast
                   draft-bormann-dyncast-affinity-00

Abstract

   Dyncast support in the network provides a client with a fresh optimal
   path to a service provider instance, where optimality includes both
   path and service provider characteristics.  As a service invocation
   usually takes more than one packet, dyncast needs to provide instance
   affinity for each service invocation.  Naive implementations of
   instance affinity require per-application, per service-invocation
   state in the network.

   The present short document defines a way to provide instance affinity
   that does not require, but also does not rule out per-application
   state.

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
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   This Internet-Draft will expire on 26 August 2021.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.

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   Please review these documents carefully, as they describe your rights
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   extracted from this document must include Simplified BSD License text
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   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Assumptions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Objectives  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Approach  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   6.  Discussion  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   7.  Details . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   8.  Legacy IP Considerations  . . . . . . . . . . . . . . . . . .   6
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   6
     11.2.  Informative References . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   Dyncast support in the network provides a client with a fresh optimal
   path to a service provider instance, where optimality includes both
   path and service provider characteristics.  As a service invocation
   usually takes more than one packet, dyncast needs to provide instance
   affinity for each service invocation.  Naive implementations of
   instance affinity require per-application, per service-invocation
   state in the network.

   The present short document defines a way to provide instance affinity
   that does not require, but also does not rule out per-application
   state.

   [I-D.liu-dyncast-ps-usecases] lists use cases of dyncast.  The
   present document does not discuss the specifics of how the network
   provides dyncast, such as the way service instance metrics enter path
   computations.

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2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

   This document uses the terminology of [I-D.liu-dyncast-ps-usecases],
   in particular _Service_ and _Service Instance_ (the latter often