Extensions to IS-IS to Associate TE Attributes with TE Attribute Sets and SRLGs with SRLG Sets
draft-bowers-isis-te-attribute-set-00

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ISIS Working Group                                             C. Bowers
Internet-Draft                                                  S. Hegde
Intended status: Standards Track                        Juniper Networks
Expires: January 4, 2018                                    July 3, 2017

 Extensions to IS-IS to Associate TE Attributes with TE Attribute Sets
                        and SRLGs with SRLG Sets
                 draft-bowers-isis-te-attribute-set-00

Abstract

   This document specifies encodings that allow traffic engineering
   attributes to be associated with different TE attribute set
   identifiers and SRLGs to be associated with SRLG set identifiers.

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Bowers & Hegde           Expires January 4, 2018                [Page 1]
Internet-Draft           ISIS TE Attribute Sets                July 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Basic assumptions . . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  Minimize disruption . . . . . . . . . . . . . . . . . . .   2
     2.2.  Maximize flexibilty . . . . . . . . . . . . . . . . . . .   3
   3.  TE Link Attributes that would benefit from this new
       functionality . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Link Attribute Set sub-TLV  . . . . . . . . . . . . . . . . .   4
   5.  TE Attribute Set usage  . . . . . . . . . . . . . . . . . . .   5
   6.  SRLG Set Scoped SRLG TLV  . . . . . . . . . . . . . . . . . .   6
   7.  SRLG Set usage  . . . . . . . . . . . . . . . . . . . . . . .   7
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   9.  Management Considerations . . . . . . . . . . . . . . . . . .   9
   10. Security Considerations . . . . . . . . . . . . . . . . . . .   9
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  10
     12.2.  Informative References . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   IS-IS encodings allow traffic engineering (TE) attributes, such as
   bandwidth-related parameters and administrative groups, as well as
   shared risk link groups (SRLGs) to be associated with different links
   in the network topology.  Different applications use these attributes
   to decide how traffic should be directed across the network.

   It can be useful for different applications to use different sets of
   TE attributes and SRLGs to decide how traffic is directed across the
   network.  Existing IS-IS encodings only allow for one set of TE
   attributes and SRLGs to be associated with a given link.  This
   document specifies encodings that allow different sets of TE
   attributes and SRLGs to be associated with a given link.

2.  Basic assumptions

   There are several different approaches that one could take to enable
   this functionality.  The approach taken by this document is based on
   the following assumptions about the use of this encoding.

2.1.  Minimize disruption

   The requirements of many current and future deployments of SR and
   RSVP can be satisfied using the existing encodings that support a
   single set of TE attributes and SRLGs.  The encodings described here
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