Resource Reservation Protocol (RSVP) Extensions for Path Key Support
RFC 5553
Network Working Group A. Farrel, Ed.
Request for Comments: 5553 Old Dog Consulting
Category: Standards Track R. Bradford
JP. Vasseur
Cisco Systems, Inc.
May 2009
Resource Reservation Protocol (RSVP) Extensions for Path Key Support
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
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Farrel, et al. Standards Track [Page 1]
RFC 5553 RSVP Extensions for Path Key Support May 2009
Abstract
The paths taken by 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.
To preserve confidentiality of topology within each AS, the PCEs
support a mechanism to hide the contents of a segment of a path (such
as the segment of the path that traverses an AS), called the
Confidential Path Segment (CPS), by encoding the contents as a Path
Key Subobject (PKS) and embedding this subobject within the result of
its path computation.
This document describes how to carry Path Key Subobjects in the
Resource Reservation Protocol (RSVP) Explicit Route Objects (EROs)
and Record Route Objects (RROs) so as to facilitate confidentiality
in the signaling of inter-domain TE LSPs.
1. Introduction
Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS)
Traffic Engineering (TE) Label Switched Paths (LSPs) are signaled
using the TE extensions to the Resource Reservation Protocol (RSVP-
TE) [RFC3209], [RFC3473]. The routes followed by MPLS and GMPLS TE
LSPs may be computed by Path Computation Elements (PCEs) [RFC4655].
Where the TE LSP crosses multiple domains [RFC4726], 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. To preserve confidentiality of topology with each AS, the PCE
Communications Protocol (PCEP) [RFC5440] supports a mechanism to hide
the contents of a segment of a path, called the Confidential Path
Segment (CPS), by encoding the contents as a Path Key Subobject (PKS)
[RFC5520].
This document defines RSVP-TE protocol extensions necessary to
support the use of Path Key Subobjects in MPLS and GMPLS signaling by
including them in Explicit Route Objects (EROs) and Record Route
Object (RROs) so as to facilitate confidentiality in the signaling of
inter-domain TE LSPs.
Farrel, et al. Standards Track [Page 2]
RFC 5553 RSVP Extensions for Path Key Support May 2009
1.1. 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].
1.2. Usage Scenario
Figure 1 shows a simple network constructed of two ASes. An LSP is
desired from the ingress in AS-1 to the egress in AS-2. As described
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