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ISIS Protocol Extensions for Boundary Node Discovery (BND)
draft-dhody-pce-bn-discovery-isis-09

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Last updated: 2014-09-15
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PCE Working Group                                               D. Dhody
Internet-Draft                                                  U. Palle
Intended status: Experimental          Huawei Technologies India Pvt Ltd
Expires: March 19, 2015                               September 15, 2014

       ISIS Protocol Extensions for Boundary Node Discovery (BND)
                  draft-dhody-pce-bn-discovery-isis-09

Abstract

   The Path Computation Element (PCE) may be used for computing multi-
   domain (Area or AS) Multiprotocol Label Switching (MPLS) and
   Generalized MPLS (GMPLS) Traffic Engineered (TE) Label Switch Path
   (LSP).

   In this circumstance, it is highly desirable to be able to
   dynamically and automatically discover a set of Boundary Nodes (BN)
   along with their domain information in a simple way.  For that
   purpose, this document defines extensions to the Intermediate System
   to Intermediate System(IS-IS) routing protocol for the advertisement
   of Boundary Node (BN)Discovery information within an IS-IS area or
   within the entire IS-IS routing domain.

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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   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 March 19, 2015.

Copyright Notice

   Copyright (c) 2014 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

Dhody & Palle            Expires March 19, 2015                 [Page 1]
Internet-Draft                  ISIS BND                  September 2014

   (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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Applications  . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Existing Mechanisms . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  ISIS  . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     4.2.  Inter-AS TE Link  . . . . . . . . . . . . . . . . . . . .   6
     4.3.  ISIS Area Topology  . . . . . . . . . . . . . . . . . . .   6
   5.  Other Considerations  . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Static Configurations . . . . . . . . . . . . . . . . . .   6
     5.2.  Importance of Domain Information along with BNs . . . . .   6
     5.3.  Relationship to Domain-Sequence . . . . . . . . . . . . .   7
   6.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Boundary Node (BN) Discovery Information  . . . . . . . .   7
     6.2.  Flooding Scope  . . . . . . . . . . . . . . . . . . . . .   7
   7.  The IS-IS BND Sub-TLV . . . . . . . . . . . . . . . . . . . .   7
     7.1.  BN-ADDRESS Sub-TLV  . . . . . . . . . . . . . . . . . . .   8
     7.2.  BN-DOMAIN Sub-TLV . . . . . . . . . . . . . . . . . . . .   9
   8.  Elements of Procedure . . . . . . . . . . . . . . . . . . . .   9
   9.  Backward Compatibility  . . . . . . . . . . . . . . . . . . .  10
   10. Impact on Network . . . . . . . . . . . . . . . . . . . . . .  10
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   12. Security Considerations . . . . . . . . . . . . . . . . . . .  11
   13. Manageability Considerations  . . . . . . . . . . . . . . . .  11
   14. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  11
   15. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     15.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     15.2.  Informative References . . . . . . . . . . . . . . . . .  12

1.  Introduction

   This document defines extensions to IS-IS [ISO10589] to allow a

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