Signaling Entropy Label Capability Using OSPF
draft-ietf-ospf-mpls-elc-03

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Last updated 2016-10-18
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OSPF Working Group                                                 X. Xu
Internet-Draft                                                    Huawei
Intended status: Standards Track                                 S. Kini
Expires: April 21, 2017
                                                            S. Sivabalan
                                                             C. Filsfils
                                                                   Cisco
                                                            S. Litkowski
                                                                  Orange
                                                        October 18, 2016

             Signaling Entropy Label Capability Using OSPF
                      draft-ietf-ospf-mpls-elc-03

Abstract

   Multi Protocol Label Switching (MPLS) has defined a mechanism to load
   balance traffic flows using Entropy Labels (EL).  An ingress LSR
   cannot insert ELs for packets going into a given tunnel unless an
   egress LSR has indicated via signaling that it can process ELs on
   that tunnel.  This draft defines a mechanism to signal that
   capability using OSPF.  This mechanism is useful when the label
   advertisement is also done via OSPF.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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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   This Internet-Draft will expire on April 21, 2017.

Xu, et al.               Expires April 21, 2017                 [Page 1]
Internet-Draft          Signalling ELC using OSPF           October 2016

Copyright Notice

   Copyright (c) 2016 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Non-OSPF Functional Capabilities TLV  . . . . . . . . . . . .   3
   4.  Advertising ELC Using OSPF  . . . . . . . . . . . . . . . . .   4
   5.  Advertising RLDC Using OSPF . . . . . . . . . . . . . . . . .   4
   6.  Usage and Applicability . . . . . . . . . . . . . . . . . . .   4
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   5
     10.2.  Informative References . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   Multi Protocol Label Switching (MPLS) has defined a method in
   [RFC6790] to load balance traffic flows using Entropy Labels (EL).
   An ingress LSR cannot insert ELs for packets going into a given
   tunnel unless an egress LSR has indicated that it can process ELs on
   that tunnel.  [RFC6790] defines the signaling of this capability
   (a.k.a., Entropy Label Capability - ELC) via signaling protocols.
   Recently, mechanisms are being defined to signal labels via link
   state Interior Gateway Protocols (IGP) such as OSPF
   [I-D.ietf-ospf-segment-routing-extensions] . In such scenario the
   signaling mechanisms defined in [RFC6790] are inadequate.  This draft
   defines a mechanism to signal the ELC using OSPF.  This mechanism is
   useful when the label advertisement is also done via OSPF.  In
   addition, in the cases where stacked LSPs are used for whatever
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