Techniques to Improve the Scalability of RSVP-TE Deployments
RFC 8370

Document Type RFC - Proposed Standard (May 2018; No errata)
Last updated 2018-05-11
Replaces draft-beeram-teas-rsvp-te-scaling-rec
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Document shepherd Lou Berger
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Send notices to Lou Berger <lberger@labn.net>
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Internet Engineering Task Force (IETF)                    V. Beeram, Ed.
Request for Comments: 8370                              Juniper Networks
Category: Standards Track                                       I. Minei
ISSN: 2070-1721                                                R. Shakir
                                                             Google, Inc
                                                              D. Pacella
                                                                 Verizon
                                                                 T. Saad
                                                           Cisco Systems
                                                                May 2018

      Techniques to Improve the Scalability of RSVP-TE Deployments

Abstract

   Networks that utilize RSVP-TE LSPs are encountering implementations
   that have a limited ability to support the growth in the number of
   LSPs deployed.

   This document defines two techniques, Refresh-Interval Independent
   RSVP (RI-RSVP) and Per-Peer Flow Control, that reduce the number of
   processing cycles required to maintain RSVP-TE LSP state in Label
   Switching Routers (LSRs) and hence allow implementations to support
   larger scale deployments.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8370.

Beeram, et al.               Standards Track                    [Page 1]
RFC 8370              RSVP-TE Scaling - Techniques              May 2018

Copyright Notice

   Copyright (c) 2018 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.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Required Support for RFC 2961 . . . . . . . . . . . . . . . .   4
     2.1.  Required Functionality from RFC 2961  . . . . . . . . . .   4
     2.2.  Making Acknowledgements Mandatory . . . . . . . . . . . .   4
   3.  Refresh-Interval Independent RSVP (RI-RSVP) . . . . . . . . .   5
     3.1.  Capability Advertisement  . . . . . . . . . . . . . . . .   6
     3.2.  Compatibility . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Per-Peer Flow Control . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Capability Advertisement  . . . . . . . . . . . . . . . .   7
     4.2.  Compatibility . . . . . . . . . . . . . . . . . . . . . .   7
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  Capability Object Values  . . . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Appendix A.  Recommended Defaults . . . . . . . . . . . . . . . .  10
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  10
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

Beeram, et al.               Standards Track                    [Page 2]
RFC 8370              RSVP-TE Scaling - Techniques              May 2018

1.  Introduction

   Networks that utilize RSVP-TE [RFC3209] LSPs are encountering
   implementations that have a limited ability to support the growth in
   the number of LSPs deployed.

   The set of RSVP Refresh Overhead Reduction procedures [RFC2961]
   serves as a powerful toolkit for RSVP-TE implementations to help
   cover a majority of the concerns about soft-state scaling.  However,
   even with these tools in the toolkit, analysis of existing
   implementations [RFC5439] indicates that the processing required
   beyond a certain scale may still cause significant disruption to a
   Label Switching Router (LSR).

   This document builds on existing scaling work and analysis and
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