Signaling Entropy Label Capability and Entropy Readable Label-stack Depth Using OSPF
draft-ietf-ospf-mpls-elc-12

Document Type Active Internet-Draft (lsr WG)
Last updated 2019-10-25
Replaces draft-xu-ospf-mpls-elc
Stream IETF
Intended RFC status Proposed Standard
Formats plain text pdf htmlized bibtex
Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Acee Lindem
Shepherd write-up Show (last changed 2019-10-24)
IESG IESG state Publication Requested
Consensus Boilerplate Yes
Telechat date
Responsible AD Alvaro Retana
Send notices to Acee Lindem <acee@cisco.com>
OSPF Working Group                                                 X. Xu
Internet-Draft                                               Alibaba Inc
Intended status: Standards Track                                 S. Kini
Expires: April 27, 2020
                                                               P. Psenak
                                                             C. Filsfils
                                                            S. Litkowski
                                                     Cisco Systems, Inc.
                                                                M. Bocci
                                                                   Nokia
                                                        October 25, 2019

  Signaling Entropy Label Capability and Entropy Readable Label-stack
                            Depth Using OSPF
                      draft-ietf-ospf-mpls-elc-12

Abstract

   Multiprotocol Label Switching (MPLS) has defined a mechanism to load-
   balance traffic flows using Entropy Labels (EL).  An ingress Label
   Switching Router (LSR) cannot insert ELs for packets going into a
   given tunnel unless an egress LSR has indicated via signaling that it
   has the capability to process ELs, referred to as Entropy Label
   Capability (ELC), on that tunnel.  In addition, it would be useful
   for ingress LSRs to know each LSR's capability of reading the maximum
   label stack depth and performing EL-based load-balancing, referred to
   as Entropy Readable Label Depth (ERLD).  This document defines a
   mechanism to signal these two capabilities using OSPF and OSPFv3.
   These mechanism is particularly useful in the environment where
   Segment Routing (SR) is used, where label advertisements are done via
   protocols like OSPF and OSPFv3.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

Xu, et al.               Expires April 27, 2020                 [Page 1]
Internet-Draft      Signaling ELC and ERLD using OSPF       October 2019

   This Internet-Draft will expire on April 27, 2020.

Copyright Notice

   Copyright (c) 2019 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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Advertising ELC Using OSPF  . . . . . . . . . . . . . . . . .   3
     3.1.  Advertising ELC Using OSPFv2  . . . . . . . . . . . . . .   4
     3.2.  Advertising ELC Using OSPFv3  . . . . . . . . . . . . . .   4
   4.  Advertising ERLD Using OSPF . . . . . . . . . . . . . . . . .   4
   5.  Signaling ELC and ERLD in BGP-LS  . . . . . . . . . . . . . .   4
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   9.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   5
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   6
     10.2.  Informative References . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   [RFC6790] describes a method to load-balance Multiprotocol Label
   Switching (MPLS) traffic flows using Entropy Labels (EL).  It also
   introduces the concept of Entropy Label Capability (ELC) and defines
   the signaling of this capability via MPLS signaling protocols.
   Recently, mechanisms have been defined to signal labels via link-
   state Interior Gateway Protocols (IGP) such as OSPF
   [I-D.ietf-ospf-segment-routing-extensions].  In such scenarios, the
   signaling mechanisms defined in [RFC6790] are inadequate.  This draft
Show full document text