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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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