IS-IS TE Attributes per application
draft-ietf-isis-te-app-13

Document Type Active Internet-Draft (lsr WG)
Last updated 2020-05-29 (latest revision 2020-05-18)
Replaces draft-ginsberg-isis-te-app
Stream IETF
Intended RFC status Proposed Standard
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Document shepherd Acee Lindem
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Send notices to Acee Lindem <acee@cisco.com>, aretana.ietf@gmail.com
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Networking Working Group                                     L. Ginsberg
Internet-Draft                                                 P. Psenak
Intended status: Standards Track                           Cisco Systems
Expires: November 19, 2020                                    S. Previdi
                                                                  Huawei
                                                           W. Henderickx
                                                                   Nokia
                                                                J. Drake
                                                        Juniper Networks
                                                            May 18, 2020

                  IS-IS TE Attributes per application
                       draft-ietf-isis-te-app-13

Abstract

   Existing traffic engineering related link attribute advertisements
   have been defined and are used in RSVP-TE deployments.  Since the
   original RSVP-TE use case was defined, additional applications (e.g.,
   Segment Routing Traffic Engineering, Loop Free Alternate) have been
   defined which also make use of the link attribute advertisements.  In
   cases where multiple applications wish to make use of these link
   attributes the current advertisements do not support application
   specific values for a given attribute nor do they support indication
   of which applications are using the advertised value for a given
   link.  This document introduces new link attribute advertisements
   which address both of these shortcomings.

Requirements Language

   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.

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/.

Ginsberg, et al.        Expires November 19, 2020               [Page 1]
Internet-Draft           draft-ietf-isis-te-app                 May 2020

   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."

   This Internet-Draft will expire on November 19, 2020.

Copyright Notice

   Copyright (c) 2020 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements Discussion . . . . . . . . . . . . . . . . . . .   4
   3.  Legacy Advertisements . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Legacy sub-TLVs . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Legacy SRLG Advertisements  . . . . . . . . . . . . . . .   5
   4.  Advertising Application Specific Link Attributes  . . . . . .   6
     4.1.  Application Identifier Bit Mask . . . . . . . . . . . . .   6
     4.2.  Application Specific Link Attributes sub-TLV  . . . . . .   8
       4.2.1.  Special Considerations for Maximum Link Bandwidth . .   9
       4.2.2.  Special Considerations for Reservable/Unreserved
               Bandwidth . . . . . . . . . . . . . . . . . . . . . .  10
       4.2.3.  Considerations for Extended TE Metrics  . . . . . . .  10
     4.3.  Application Specific SRLG TLV . . . . . . . . . . . . . .  10
   5.  Attribute Advertisements and Enablement . . . . . . . . . . .  11
   6.  Deployment Considerations . . . . . . . . . . . . . . . . . .  12
     6.1.  Use of Legacy Advertisements  . . . . . . . . . . . . . .  12
     6.2.  Use of Zero Length Application Identifier Bit Masks . . .  13
     6.3.  Interoperability, Backwards Compatibility and Migration
           Concerns  . . . . . . . . . . . . . . . . . . . . . . . .  14
       6.3.1.  Multiple Applications: Common Attributes with  RSVP-
               TE  . . . . . . . . . . . . . . . . . . . . . . . . .  14
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