[Pce] I-D Action:draft-ietf-pce-path-key-05.txt
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Subject: [Pce] I-D Action:draft-ietf-pce-path-key-05.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Path Computation Element Working Group of the IETF. Title : Preserving Topology Confidentiality in Inter-Domain Path Computation Using a Key-Based Mechanism Author(s) : R. Bradford, et al. Filename : draft-ietf-pce-path-key-05.txt Pages : 19 Date : 2008-11-17 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, Vasseur and Farrel [page 1] draft-ietf-pce-path-key-05.txt November 2008 This document defines a mechanism to hide the contents of a segment of a path, called the Confidential Path Segment (CPS). The CPS may be replaced by a path-key that can be conveyed in the PCE Communication Protocol (PCEP) and signaled within in a Resource Reservation Protocol TE (RSVP-TE) explicit route object. Conventions used in this document The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC-2119 [RFC2119]. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-pce-path-key-05.txt Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ Below is the data which will enable a MIME compliant mail reader implementation to automatically retrieve the ASCII version of the Internet-Draft.
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