draft-ietf-mpls-tp-rosetta-stone-10.txt   draft-ietf-mpls-tp-rosetta-stone-11.txt 
MPLS Working Group H. van Helvoort (Ed) MPLS Working Group H. van Helvoort (Ed)
Internet Draft Huawei Technologies Internet Draft Huawei Technologies
Intended status: Informational Intended status: Informational
Expires: August 2013 L. Andersson (Ed) Expires: January 2014 L. Andersson (Ed)
Huawei Technologies Huawei Technologies
N. Sprecher (Ed) N. Sprecher (Ed)
Nokia Siemens Networks Nokia Siemens Networks
February 12, 2013 July 13, 2013
A Thesaurus for the Terminology used in Multiprotocol Label A Thesaurus for the Terminology used in Multiprotocol Label
Switching Transport Profile (MPLS-TP) drafts/RFCs and ITU-T's Switching Transport Profile (MPLS-TP) drafts/RFCs and ITU-T's
Transport Network Recommendations. Transport Network Recommendations.
draft-ietf-mpls-tp-rosetta-stone-10 draft-ietf-mpls-tp-rosetta-stone-11
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with This Internet-Draft is submitted to IETF in full conformance with
the provisions of BCP 78 and BCP 79. the provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
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months and may be updated, replaced, or obsoleted by other documents months and may be updated, replaced, or obsoleted by other documents
at any time. It is inappropriate to use Internet-Drafts as reference at any time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt. http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html. http://www.ietf.org/shadow.html.
This Internet-Draft will expire in August 2013. This Internet-Draft will expire on January 13, 2014.
Copyright Notice Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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contexts than just Transport Networks. The definitions presented in contexts than just Transport Networks. The definitions presented in
this document do not provide exclusive nor complete interpretations this document do not provide exclusive nor complete interpretations
of MPLS-TP concepts. This document simply allows the MPLS-TP terms of MPLS-TP concepts. This document simply allows the MPLS-TP terms
to be applied within the Transport Network context. to be applied within the Transport Network context.
Table of Contents Table of Contents
1. Introduction 4 1. Introduction 4
1.1. Contributing Authors 4 1.1. Contributing Authors 4
1.2. Abbreviations 4 1.2. Abbreviations 4
SCC Signaling Communication Channel 5
2. Terminology 5 2. Terminology 5
2.1. MPLS-TP Terminology Sources 5 2.1. MPLS-TP Terminology Sources 5
2.2. ITU-T Transport Network Terminology Sources 5 2.2. ITU-T Transport Network Terminology Sources 5
2.3. Common Terminology Sources 6 2.3. Common Terminology Sources 6
3. Thesaurus 6 3. Thesaurus 6
3.1. Associated bidirectional path: 6 3.1. Associated bidirectional path: 6
3.2. Bidirectional path: 6 3.2. Bidirectional path: 6
3.3. Client layer network: 6 3.3. Client layer network: 6
3.4. Communication Channel (CC): 6 3.4. Communication Channel (CC): 6
3.5. Concatenated Segment: 7 3.5. Concatenated Segment: 7
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3.28. MPLS-TP Recovery: 12 3.28. MPLS-TP Recovery: 12
3.28.1. End-to-end recovery: 12 3.28.1. End-to-end recovery: 12
3.28.2. Link recovery: 12 3.28.2. Link recovery: 12
3.28.3. Segment recovery: 12 3.28.3. Segment recovery: 12
3.29. MPLS-TP Ring Topology: 13 3.29. MPLS-TP Ring Topology: 13
3.29.1. MPLS-TP Logical Ring: 13 3.29.1. MPLS-TP Logical Ring: 13
3.29.2. MPLS-TP Physical Ring: 13 3.29.2. MPLS-TP Physical Ring: 13
3.30. OAM flow: 13 3.30. OAM flow: 13
3.31. Operations System (OS): 13 3.31. Operations System (OS): 13
3.32. Path: 13 3.32. Path: 13
3.33. Section Layer Network: 13 3.33. Protection priority: 13
3.34. Segment: 14 3.34. Section Layer Network: 14
3.35. Server layer: 14 3.35. Segment: 14
3.36. Server MEPs: 14 3.36. Server layer: 14
3.37. Signaling Communication Channel (SCC): 15 3.37. Server MEPs: 14
3.38. Signaling Communication Network (SCN): 15 3.38. Signaling Communication Channel (SCC): 15
3.39. Span: 15 3.39. Signaling Communication Network (SCN): 15
3.40. Sublayer: 15 3.40. Span: 15
3.41. Transport Entity: 15 3.41. Sublayer: 15
3.41.1. Working Entity: 15 3.42. Transport Entity: 15
3.41.2. Protection Entity: 16 3.42.1. Working Entity: 16
3.41.3. Recovery entity: 16 3.42.2. Protection Entity: 16
3.42. Transmission media layer: 16 3.42.3. Recovery entity: 16
3.43. Transport Network: 16 3.43. Transmission media layer: 16
3.44. Transport path: 16 3.44. Transport Network: 16
3.45. Transport path layer: 16 3.45. Transport path: 16
3.46. Transport service layer: 17 3.46. Transport path layer: 16
3.47. Unidirectional path: 17 3.47. Transport service layer: 17
3.48. Unidirectional path: 17
4. Guidance on the Application of this Thesaurus 17 4. Guidance on the Application of this Thesaurus 17
5. Management Considerations 17 5. Management Considerations 17
6. Security Considerations 18 6. Security Considerations 18
7. IANA Considerations 18 7. IANA Considerations 18
8. Acknowledgments 18 8. Acknowledgments 18
9. References 18 9. References 18
9.1. Normative References 18 9.1. Normative References 18
9.2. Informative References 20 9.2. Informative References 20
1. Introduction 1. Introduction
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CC Communications Channel CC Communications Channel
CE Customer Edge CE Customer Edge
DCN Data Communication Network DCN Data Communication Network
ECC Embedded Communication Channel ECC Embedded Communication Channel
EMF Equipment Management Function EMF Equipment Management Function
MCC Management Communication Channel
MCC Management Communication Channel
MCN Management Communication Network MCN Management Communication Network
ME Maintenance Entity ME Maintenance Entity
MEG Maintenance Entity Group MEG Maintenance Entity Group
MEP Maintenance Entity Group End Point MEP Maintenance Entity Group End Point
MIP Maintenance Entity Group Intermediate Point MIP Maintenance Entity Group Intermediate Point
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A system that performs the functions that support processing of A system that performs the functions that support processing of
information related to operations, administration, maintenance, and information related to operations, administration, maintenance, and
provisioning (OAM&P) for the networks, including surveillance and provisioning (OAM&P) for the networks, including surveillance and
testing functions to support customer access maintenance. testing functions to support customer access maintenance.
3.32. Path: 3.32. Path:
See Transport path. See Transport path.
3.33. Section Layer Network: 3.33. Protection priority:
Fault conditions (e.g., signal failed), external commands (e.g,
forced switch, manual switch) and protection states (e.g., no
request) are defined to have a relative priority with respect to
each other. Priority is applied to these conditions/command/states
locally at each endpoint and between the two endpoints.
3.34. Section Layer Network:
A section layer is a server layer (which may be MPLS-TP or a A section layer is a server layer (which may be MPLS-TP or a
different technology) that provides for the transfer of the section- different technology) that provides for the transfer of the section-
layer client information between adjacent nodes in the transport- layer client information between adjacent nodes in the transport-
path layer or transport-service layer. A section layer may provide path layer or transport-service layer. A section layer may provide
for aggregation of multiple MPLS-TP clients. Note that [ITU- for aggregation of multiple MPLS-TP clients. Note that [ITU-
T_G.805] defines the section layer as one of the two layer networks T_G.805] defines the section layer as one of the two layer networks
in a transmission-media layer network. The other layer network is in a transmission-media layer network. The other layer network is
the physical-media layer network. the physical-media layer network.
Section layer networks are concerned with all the functions which Section layer networks are concerned with all the functions which
provide for the transfer of information between locations in path provide for the transfer of information between locations in path
layer networks. layer networks.
Physical media layer networks are concerned with the actual fibres, Physical media layer networks are concerned with the actual fibres,
metallic wires or radio frequency channels which support a section metallic wires or radio frequency channels which support a section
layer network. layer network.
3.34. Segment: 3.35. Segment:
A link connection as defined in [ITU-T_G.805]. A segment is the A link connection as defined in [ITU-T_G.805]. A segment is the
part of an LSP that traverses a single link or the part of a PW that part of an LSP that traverses a single link or the part of a PW that
traverses a single link (i.e., that connects a pair of adjacent traverses a single link (i.e., that connects a pair of adjacent
{Switching|Terminating} Provider Edges). See also "Concatenated {Switching|Terminating} Provider Edges). See also "Concatenated
Segment". Segment".
3.35. Server layer: 3.36. Server layer:
A service layer is a layer network in which transport paths are used A service layer is a layer network in which transport paths are used
to carry a customer's (individual or bundled) service (may be point- to carry a customer's (individual or bundled) service (may be point-
to-point, point-to-multipoint or multipoint-to-multipoint services). to-point, point-to-multipoint or multipoint-to-multipoint services).
In a client/server relationship (see [ITU-T_G.805]) the server layer In a client/server relationship (see [ITU-T_G.805]) the server layer
network provides a (transport) service to the higher client layer network provides a (transport) service to the higher client layer
network (usually the layer network under consideration). network (usually the layer network under consideration).
3.36. Server MEPs: 3.37. Server MEPs:
A server MEP is a MEP of an ME that is defined in a layer network A server MEP is a MEP of an ME that is defined in a layer network
below the MPLS-TP layer network being referenced. A server MEP below the MPLS-TP layer network being referenced. A server MEP
coincides with either a MIP or a MEP in the client (MPLS-TP) layer coincides with either a MIP or a MEP in the client (MPLS-TP) layer
network. See also [RFC6371] section 3.5 and [ITU-T G.8113.1] clause network. See also [RFC6371] section 3.5 and [ITU-T G.8113.1] clause
6.5. 6.5.
For example, a server MEP can be either: For example, a server MEP can be either:
. A termination point of a physical link (e.g. IEEE 802.3), an SDH . A termination point of a physical link (e.g. IEEE 802.3), an SDH
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. An MPLS-TP LSP MEP for MPLS-TP PWs, defined in [RFC6371] section . An MPLS-TP LSP MEP for MPLS-TP PWs, defined in [RFC6371] section
3.4.; 3.4.;
. An MPLS-TP TCM MEP for higher-level TCMs, defined in [RFC6371] . An MPLS-TP TCM MEP for higher-level TCMs, defined in [RFC6371]
sections 3.3. and 3.5. sections 3.3. and 3.5.
The server MEP can run appropriate OAM functions for fault The server MEP can run appropriate OAM functions for fault
detection, and notifies a fault indication to the MPLS-TP layer detection, and notifies a fault indication to the MPLS-TP layer
network. network.
3.37. Signaling Communication Channel (SCC): 3.38. Signaling Communication Channel (SCC):
A CC dedicated for control plane communications. The SCC may be used A CC dedicated for control plane communications. The SCC may be used
for GMPLS/ASON signaling and/or other control plane messages (e.g., for GMPLS/ASON signaling and/or other control plane messages (e.g.,
routing messages). routing messages).
3.38. Signaling Communication Network (SCN): 3.39. Signaling Communication Network (SCN):
A DCN supporting control plane communication is referred to as a A DCN supporting control plane communication is referred to as a
Signaling Communication Network (SCN). Signaling Communication Network (SCN).
3.39. Span: 3.40. Span:
A span is synonymous with a link. A span is synonymous with a link.
3.40. Sublayer: 3.41. Sublayer:
Sublayer is defined in [ITU-T_G.805]. The distinction between a Sublayer is defined in [ITU-T_G.805]. The distinction between a
layer network and a sublayer is that a sublayer is not directly layer network and a sublayer is that a sublayer is not directly
accessible to clients outside of its encapsulating layer network and accessible to clients outside of its encapsulating layer network and
offers no direct transport service for a higher layer (client) offers no direct transport service for a higher layer (client)
network. network.
3.41. Transport Entity: 3.42. Transport Entity:
A "Transport Entity" is a node, link, transport path segment, A "Transport Entity" is a node, link, transport path segment,
concatenated transport path segment, or entire transport path. concatenated transport path segment, or entire transport path.
3.41.1. Working Entity: 3.42.1. Working Entity:
A "Working Entity" is a transport entity that carries traffic during A "Working Entity" is a transport entity that carries traffic during
normal network operation. normal network operation.
3.41.2. Protection Entity: 3.42.2. Protection Entity:
A "Protection Entity" is a transport entity that is pre-allocated A "Protection Entity" is a transport entity that is pre-allocated
and used to protect and transport traffic when the working entity and used to protect and transport traffic when the working entity
fails. fails.
3.41.3. Recovery entity: 3.42.3. Recovery entity:
A "Recovery Entity" is a transport entity that is used to recover A "Recovery Entity" is a transport entity that is used to recover
and transport traffic when the working entity fails. and transport traffic when the working entity fails.
3.42. Transmission media layer: 3.43. Transmission media layer:
A layer network, consisting of a section layer network and a A layer network, consisting of a section layer network and a
physical layer network as defined in [ITU-T_G.805], that provides physical layer network as defined in [ITU-T_G.805], that provides
sections (two-port point-to-point connections) to carry the sections (two-port point-to-point connections) to carry the
aggregate of network-transport path or network-service layers on aggregate of network-transport path or network-service layers on
various physical media. various physical media.
3.43. Transport Network: 3.44. Transport Network:
A Transport Network provides transmission of traffic between A Transport Network provides transmission of traffic between
attached client devices by establishing and maintaining point-to- attached client devices by establishing and maintaining point-to-
point or point-to-multipoint connections between such devices. A point or point-to-multipoint connections between such devices. A
Transport Network is independent of any higher-layer network that Transport Network is independent of any higher-layer network that
may exist between clients, except to the extent required to supply may exist between clients, except to the extent required to supply
this transmission service. In addition to client traffic, a this transmission service. In addition to client traffic, a
Transport Network may carry traffic to facilitate its own operation, Transport Network may carry traffic to facilitate its own operation,
such as that required to support connection control, network such as that required to support connection control, network
management, and Operations, Administration and Maintenance (OAM) management, and Operations, Administration and Maintenance (OAM)
functions. functions.
3.44. Transport path: 3.45. Transport path:
A network connection as defined in [ITU-T_G.805]. In an MPLS-TP A network connection as defined in [ITU-T_G.805]. In an MPLS-TP
environment a transport path corresponds to an LSP or a PW. environment a transport path corresponds to an LSP or a PW.
3.45. Transport path layer: 3.46. Transport path layer:
A (sub)layer network that provides point-to-point or point-to- A (sub)layer network that provides point-to-point or point-to-
multipoint transport paths. It provides OAM that is independent of multipoint transport paths. It provides OAM that is independent of
the clients that it is transporting. the clients that it is transporting.
3.46. Transport service layer: 3.47. Transport service layer:
A layer network in which transport paths are used to carry a A layer network in which transport paths are used to carry a
customer's (individual or bundled) service (may be point-to-point, customer's (individual or bundled) service (may be point-to-point,
point-to-multipoint or multipoint-to-multipoint services). point-to-multipoint or multipoint-to-multipoint services).
3.47. Unidirectional path: 3.48. Unidirectional path:
A Unidirectional Path is a path that supports traffic flow in only A Unidirectional Path is a path that supports traffic flow in only
one direction. one direction.
4. Guidance on the Application of this Thesaurus 4. Guidance on the Application of this Thesaurus
As discussed in the introduction to this document, this thesaurus is As discussed in the introduction to this document, this thesaurus is
intended to bring the concepts and terms associated with MPLS-TP intended to bring the concepts and terms associated with MPLS-TP
into the context of the ITU-T's Transport Network architecture. into the context of the ITU-T's Transport Network architecture.
Thus, it should help those familiar with MPLS to see how they may Thus, it should help those familiar with MPLS to see how they may
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