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Preserving Topology Confidentiality in Inter-Domain Path Computation Using a Path-Key-Based Mechanism (RFC5520)

IP.com Disclosure Number: IPCOM000182391D
Original Publication Date: 2009-Apr-01
Included in the Prior Art Database: 2009-Apr-29
Document File: 38 page(s) / 43K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Bradford: AUTHOR [+4]

Abstract

Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) Traffic Engineering (TE) Label Switched Paths (LSPs) may be computed by Path Computation Elements (PCEs). Where the TE LSP crosses multiple domains, such as Autonomous Systems (ASes), the path may be computed by multiple PCEs that cooperate, with each responsible for computing a segment of the path. However, in some cases (e.g., when ASes are administered by separate Service Providers), it would break confidentiality rules for a PCE to supply a path segment to a PCE in another domain, thus disclosing AS-internal topology information. This issue may be circumvented by returning a loose hop and by invoking a new path computation from the domain boundary Label Switching Router (LSR) during TE LSP setup as the signaling message enters the second domain, but this technique has several issues including the problem of maintaining path diversity.

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Network Working Group                                   R. Bradford, Ed. Request for Comments: 5520                                   JP. Vasseur Category: Standards Track                            Cisco Systems, Inc.                                                                A. Farrel                                                       Old Dog Consulting                                                               April 2009

                 Preserving Topology Confidentiality in      Inter-Domain Path Computation Using a Path-Key-Based Mechanism

Status of This Memo

   This document specifies an Internet standards track protocol for the    Internet community, and requests discussion and suggestions for    improvements.  Please refer to the current edition of the "Internet    Official Protocol Standards" (STD 1) for the standardization state    and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (c) 2009 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 in effect on the date of    publication of this document (http://trustee.ietf.org/license-info).    Please review these documents carefully, as they describe your rights    and restrictions with respect to this document.

Abstract

   Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS)    Traffic Engineering (TE) Label Switched Paths (LSPs) may be computed    by Path Computation Elements (PCEs).  Where the TE LSP crosses    multiple domains, such as Autonomous Systems (ASes), the path may be    computed by multiple PCEs that cooperate, with each responsible for    computing a segment of the path.  However, in some cases (e.g., when    ASes are administered by separate Service Providers), it would break    confidentiality rules for a PCE to supply a path segment to a PCE in    another domain, thus disclosing AS-internal topology information.    This issue may be circumvented by returning a loose hop and by    invoking a new path computation from the domain boundary Label    Switching Router (LSR) during TE LSP setup as the signaling message    enters the second domain, but this technique has several issues    including the problem of maintaining path diversity.

Bradford, et al.            Standards Track                     [Page 1]
 RFC 5520          Preserving Topology Confidentiality         April 2009

    This docume...