I-D ACTION:draft-bradford-pce-path-key-02.txt

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	Title		: Preserving Topology Confidentiality in Inter-Domain Path Computation using a key based mechanism
	Author(s)	: R. Bradford, et al.
	Filename	: draft-bradford-pce-path-key-02.txt
	Pages		: 0
	Date		: 2007-1-5
	
Multiprotocol Label Switching (MPLS) 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 (ASs), 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 ASs 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 internal topology information. 
   This issue may be circumvented by returning a loose hop and by 
   invoking a new path computation from the domain boundary LSR 
   during TE LSP setup as the LSP 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 (RSVP) explicit route object.

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