Advertising Node Administrative Tags in IS-IS
RFC 7917

Document Type RFC - Proposed Standard (July 2016; No errata)
Last updated 2016-07-11
Replaces draft-psarkar-isis-node-admin-tag
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Christian Hopps
Shepherd write-up Show (last changed 2016-02-24)
IESG IESG state RFC 7917 (Proposed Standard)
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Responsible AD Alia Atlas
Send notices to "Christian Hopps" <chopps@chopps.org>
IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                    P. Sarkar, Ed.
Request for Comments: 7917                        Individual Contributor
Category: Standards Track                                     H. Gredler
ISSN: 2070-1721                                             RtBrick Inc.
                                                                S. Hegde
                                                  Juniper Networks, Inc.
                                                            S. Litkowski
                                                             B. Decraene
                                                                  Orange
                                                               July 2016

             Advertising Node Administrative Tags in IS-IS

Abstract

   This document describes an extension to the IS-IS routing protocol to
   advertise node administrative tags.  This optional capability allows
   tagging and grouping of the nodes in an IS-IS domain.  The node
   administrative tags can be used to express and apply locally defined
   network policies, thereby providing a very useful operational
   capability.  Node administrative tags may be used by either IS-IS
   itself or other applications consuming information propagated via IS-
   IS.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7917.

Sarkar, et al.               Standards Track                    [Page 1]
RFC 7917            Node Administrative Tags in IS-IS          July 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
   Provisions Relating to IETF Documents
   (http://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 ....................................................3
      1.1. Requirements Language ......................................3
   2. Node Administrative Tags ........................................3
   3. Node Administrative Tag (Node-Admin-Tag) Sub-TLV ................3
      3.1. TLV Format .................................................4
   4. Elements of Procedure ...........................................5
      4.1. Interpretation of Node Administrative Tags .................5
      4.2. Use of Node Administrative Tags ............................5
      4.3. Processing Node Administrative Tag Changes .................6
   5. Applications ....................................................7
   6. Security Considerations .........................................7
   7. Operational Considerations ......................................8
   8. Manageability Considerations ....................................8
   9. IANA Considerations .............................................8
   10. References .....................................................9
      10.1. Normative References ......................................9
      10.2. Informative References ....................................9
   Acknowledgments ...................................................11
   Contributors ......................................................11
   Authors' Addresses ................................................11

Sarkar, et al.               Standards Track                    [Page 2]
RFC 7917            Node Administrative Tags in IS-IS          July 2016

1.  Introduction

   It is useful to assign a node administrative tag to a router in the
   IS-IS domain and use it as an attribute associated with the node.
   The node administrative tag can be used in variety of applications.
   For example:

   (a)  Traffic-engineering applications to provide different
        path-selection criteria.

   (b)  Preference for, or pruning of, certain paths in Loop-Free
        Alternate (LFA) [RFC5286] backup selection via local policies as
        defined in [RFC7916].

   This document provides mechanisms to advertise node administrative
   tags in IS-IS for various applications, including (but not limited
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