I-D Action:draft-ietf-pce-path-key-02.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, J. Vasseur
	Filename        : draft-ietf-pce-path-key-02.txt
	Pages           : 21
	Date            : 2008-02-24

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. 
 
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.

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