OSPF Link Traffic Engineering Attribute Reuse
draft-ietf-ospf-te-link-attr-reuse-12

Document Type Active Internet-Draft (lsr WG)
Last updated 2020-05-29 (latest revision 2020-05-19)
Replaces draft-ppsenak-ospf-te-link-attr-reuse
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication
Document shepherd Yingzhen Qu
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IESG IESG state Waiting for Writeup
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Responsible AD Alvaro Retana
Send notices to Acee Lindem <acee@cisco.com>, Yingzhen Qu <yingzhen.qu@futurewei.com>, aretana.ietf@gmail.com
IANA IANA review state IANA OK - Actions Needed
LSR Working Group                                         P. Psenak, Ed.
Internet-Draft                                               L. Ginsberg
Intended status: Standards Track                           Cisco Systems
Expires: November 20, 2020                                 W. Henderickx
                                                                   Nokia
                                                             J. Tantsura
                                                                  Apstra
                                                                J. Drake
                                                        Juniper Networks
                                                            May 19, 2020

             OSPF Link Traffic Engineering Attribute Reuse
               draft-ietf-ospf-te-link-attr-reuse-12.txt

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 in
   OSPFv2 and OSPFv3 which address both of these shortcomings.

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 November 20, 2020.

Psenak, et al.          Expires November 20, 2020               [Page 1]
Internet-Draft        OSPF Link TE Attributes Reuse             May 2020

Copyright Notice

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   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  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   4
   3.  Existing Advertisement of Link Attributes . . . . . . . . . .   4
   4.  Advertisement of Link Attributes  . . . . . . . . . . . . . .   4
     4.1.  OSPFv2 Extended Link Opaque LSA and OSPFv3 E-Router-LSA .   4
   5.  Advertisement of Application Specific Values  . . . . . . . .   5
   6.  Reused TE link attributes . . . . . . . . . . . . . . . . . .   8
     6.1.  Shared Risk Link Group (SRLG) . . . . . . . . . . . . . .   8
     6.2.  Extended Metrics  . . . . . . . . . . . . . . . . . . . .   8
     6.3.  Administrative Group  . . . . . . . . . . . . . . . . . .   9
     6.4.  Traffic Engineering Metric  . . . . . . . . . . . . . . .  10
   7.  Maximum Link Bandwidth  . . . . . . . . . . . . . . . . . . .  10
   8.  Considerations for Extended TE Metrics  . . . . . . . . . . .  10
   9.  Local Interface IPv6 Address Sub-TLV  . . . . . . . . . . . .  11
   10. Remote Interface IPv6 Address Sub-TLV . . . . . . . . . . . .  11
   11. Attribute Advertisements and Enablement . . . . . . . . . . .  11
   12. Deployment Considerations . . . . . . . . . . . . . . . . . .  12
     12.1.  Use of Legacy RSVP-TE LSA Advertisements . . . . . . . .  12
     12.2.  Use of Zero Length Application Identifier Bit Masks  . .  13
     12.3.  Interoperability, Backwards Compatibility and Migration
            Concerns . . . . . . . . . . . . . . . . . . . . . . . .  13
       12.3.1.  Multiple Applications: Common Attributes with  RSVP-
                TE . . . . . . . . . . . . . . . . . . . . . . . . .  13
       12.3.2.  Multiple Applications: Some Attributes Not Shared
                with RSVP-TE . . . . . . . . . . . . . . . . . . . .  14
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