A Framework for MPLS in Transport Networks
RFC 5921
Internet Engineering Task Force (IETF) M. Bocci, Ed.
Request for Comments: 5921 Alcatel-Lucent
Category: Informational S. Bryant, Ed.
ISSN: 2070-1721 D. Frost, Ed.
Cisco Systems
L. Levrau
Alcatel-Lucent
L. Berger
LabN
July 2010
A Framework for MPLS in Transport Networks
Abstract
This document specifies an architectural framework for the
application of Multiprotocol Label Switching (MPLS) to the
construction of packet-switched transport networks. It describes a
common set of protocol functions -- the MPLS Transport Profile (MPLS-
TP) -- that supports the operational models and capabilities typical
of such networks, including signaled or explicitly provisioned
bidirectional connection-oriented paths, protection and restoration
mechanisms, comprehensive Operations, Administration, and Maintenance
(OAM) functions, and network operation in the absence of a dynamic
control plane or IP forwarding support. Some of these functions are
defined in existing MPLS specifications, while others require
extensions to existing specifications to meet the requirements of the
MPLS-TP.
This document defines the subset of the MPLS-TP applicable in general
and to point-to-point transport paths. The remaining subset,
applicable specifically to point-to-multipoint transport paths, is
outside the scope of this document.
This document is a product of a joint Internet Engineering Task Force
(IETF) / International Telecommunication Union Telecommunication
Standardization Sector (ITU-T) effort to include an MPLS Transport
Profile within the IETF MPLS and Pseudowire Emulation Edge-to-Edge
(PWE3) architectures to support the capabilities and functionalities
of a packet transport network as defined by the ITU-T.
Bocci, et al. Informational [Page 1]
RFC 5921 MPLS Transport Profile Framework July 2010
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc5921.
Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Bocci, et al. Informational [Page 2]
RFC 5921 MPLS Transport Profile Framework July 2010
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Motivation and Background . . . . . . . . . . . . . . . . 4
1.2. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3. Terminology . . . . . . . . . . . . . . . . . . . . . . . 5
1.3.1. Transport Network . . . . . . . . . . . . . . . . . . 7
1.3.2. MPLS Transport Profile . . . . . . . . . . . . . . . . 7
1.3.3. MPLS-TP Section . . . . . . . . . . . . . . . . . . . 7
1.3.4. MPLS-TP Label Switched Path . . . . . . . . . . . . . 7
1.3.5. MPLS-TP Label Switching Router . . . . . . . . . . . . 8
1.3.6. Customer Edge (CE) . . . . . . . . . . . . . . . . . . 10
1.3.7. Transport LSP . . . . . . . . . . . . . . . . . . . . 10
1.3.8. Service LSP . . . . . . . . . . . . . . . . . . . . . 10
1.3.9. Layer Network . . . . . . . . . . . . . . . . . . . . 10
1.3.10. Network Layer . . . . . . . . . . . . . . . . . . . . 10
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