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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-01.txt
Pages : 0
Date : 2007-9-12
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
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 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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