draft-ietf-mpls-tp-rosetta-stone-11.txt   draft-ietf-mpls-tp-rosetta-stone-12.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: January 2014 L. Andersson (Ed) Expires: March 2014 L. Andersson (Ed)
Huawei Technologies Huawei Technologies
N. Sprecher (Ed) N. Sprecher (Ed)
Nokia Siemens Networks Nokia Siemens Networks
July 13, 2013 September 6, 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-11 draft-ietf-mpls-tp-rosetta-stone-12
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 on January 13, 2014. This Internet-Draft will expire on March 6, 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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recommendations. recommendations.
It is important to note that MPLS-TP is applicable in a wider set of It is important to note that MPLS-TP is applicable in a wider set of
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
2. Terminology 5 1.3 5
2.1. MPLS-TP Terminology Sources 5 2 Terminology 5
2.2. ITU-T Transport Network Terminology Sources 5 2.1 MPLS-TP Terminology Sources 5
2.3. Common Terminology Sources 6 2.2 ITU-T Transport Network Terminology Sources 5
3. Thesaurus 6 2.3 Common Terminology Sources 6
3.1. Associated bidirectional path: 6 3 Thesaurus 6
3.2. Bidirectional path: 6 3.1 Associated bidirectional path: 6
3.3. Client layer network: 6 3.2 Bidirectional path: 6
3.4. Communication Channel (CC): 6 3.3 Client layer network: 6
3.5. Concatenated Segment: 7 3.4 Communication Channel (CC): 6
3.6. Control Plane: 7 3.5 Concatenated Segment: 7
3.7. Co-routed bidirectional path: 7 3.6 Control Plane: 7
3.8. Data Communication Network (DCN): 7 3.7 Co-routed bidirectional path: 7
3.9. Defect: 7 3.8 Data Communication Network (DCN): 7
3.10. Domain: 7 3.9 Defect: 7
3.11. Embedded Communication Channel (ECC): 8 3.10 Domain: 7
3.12. Equipment Management Function (EMF): 8 3.11 Embedded Communication Channel (ECC): 8
3.13. Failure: 8 3.12 Equipment Management Function (EMF): 8
3.14. Fault: 8 3.13 Failure: 8
3.15. Layer network: 8 3.14 Fault: 8
3.16. Link: 9 3.15 Layer network: 8
3.17. Maintenance Entity (ME): 9 3.16 Link: 9
3.18. Maintenance Entity Group (MEG): 9 3.17 Maintenance Entity (ME): 9
3.19. Maintenance Entity Group End Point (MEP): 10 3.18 Maintenance Entity Group (MEG): 9
3.20. Maintenance Entity Group Intermediate Point (MIP): 10 3.19 Maintenance Entity Group End Point (MEP): 10
3.21. Management Communication Channel (MCC): 10 3.20 Maintenance Entity Group Intermediate Point (MIP): 10
3.22. Management Communication Network (MCN): 10 3.21 Management Communication Channel (MCC): 10
3.23. Monitoring 11 3.22 Management Communication Network (MCN): 10
3.23.1. Path Segment Tunnel (PST): 11 3.23 Monitoring 11
3.23.2. Sub-Path Maintenance Element (SMPE): 11 3.23.1 Path Segment Tunnel (PST): 11
3.23.3. Tandem Connection: 11 3.23.2 Sub-Path Maintenance Element (SMPE): 11
3.24. MPLS Section: 12 3.23.3 Tandem Connection: 11
3.25. MPLS Transport Profile (MPLS-TP): 12 3.24 MPLS Section: 12
3.26. MPLS-TP NE: 12 3.25 MPLS Transport Profile (MPLS-TP): 12
3.27. MPLS-TP network: 12 3.26 MPLS-TP NE: 12
3.28. MPLS-TP Recovery: 12 3.27 MPLS-TP network: 12
3.28.1. End-to-end recovery: 12 3.28 MPLS-TP Recovery: 12
3.28.2. Link recovery: 12 3.28.1 End-to-end recovery: 12
3.28.3. Segment recovery: 12 3.28.2 Link recovery: 12
3.29. MPLS-TP Ring Topology: 13 3.28.3 Segment recovery: 12
3.29.1. MPLS-TP Logical Ring: 13 3.29 MPLS-TP Ring Topology: 13
3.29.2. MPLS-TP Physical Ring: 13 3.29.1 MPLS-TP Logical Ring: 13
3.30. OAM flow: 13 3.29.2 MPLS-TP Physical Ring: 13
3.31. Operations System (OS): 13 3.30 OAM flow: 13
3.32. Path: 13 3.31 Operations System (OS): 13
3.33. Protection priority: 13 3.32 Path: 13
3.34. Section Layer Network: 14 3.33 Protection priority: 13
3.35. Segment: 14 3.34 Section Layer Network: 14
3.36. Server layer: 14 3.35 Segment: 14
3.37. Server MEPs: 14 3.36 Server layer: 14
3.38. Signaling Communication Channel (SCC): 15 3.37 Server MEPs: 14
3.39. Signaling Communication Network (SCN): 15 3.38 Signaling Communication Channel (SCC): 15
3.40. Span: 15 3.39 Signaling Communication Network (SCN): 15
3.41. Sublayer: 15 3.40 Span: 15
3.42. Transport Entity: 15 3.41 Sublayer: 15
3.42.1. Working Entity: 16 3.42 Transport Entity: 15
3.42.2. Protection Entity: 16 3.42.1 Working Entity: 16
3.42.3. Recovery entity: 16 3.42.2 Protection Entity: 16
3.43. Transmission media layer: 16 3.42.3 Recovery entity: 16
3.44. Transport Network: 16 3.43 Transmission media layer: 16
3.45. Transport path: 16 3.44 Transport Network: 16
3.46. Transport path layer: 16 3.45 Transport path: 16
3.47. Transport service layer: 17 3.46 Transport path layer: 16
3.48. Unidirectional path: 17 3.47 Transport service layer: 17
4. Guidance on the Application of this Thesaurus 17 3.48 Unidirectional path: 17
5. Management Considerations 17 4 Guidance on the Application of this Thesaurus 17
6. Security Considerations 18 5 Management Considerations 17
7. IANA Considerations 18 6 Security Considerations 18
8. Acknowledgments 18 7 IANA Considerations 18
9. References 18 8 Acknowledgments 18
9.1. Normative References 18 9 References 18
9.2. Informative References 20 9.1 Normative References 18
9.2 Informative References 20
1. Introduction 1 Introduction
Multiprotocol Label Switching - Transport Profile (MPLS-TP) has been Multiprotocol Label Switching - Transport Profile (MPLS-TP) has been
developed by the IETF to facilitate the Operation, Administration developed by the IETF to facilitate the Operation, Administration
and Management of Label Switched Paths (LSPs) in a Transport Network and Management of Label Switched Paths (LSPs) in a Transport Network
environment as defined by the ITU-T. environment as defined by the ITU-T.
The ITU-T has specified a Transport Network architecture for the The ITU-T has specified a Transport Network architecture for the
transfer of signals from different technologies. This architecture transfer of signals from different technologies. This architecture
forms the basis of many Recommendations within the ITU-T. forms the basis of many Recommendations within the ITU-T.
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inherently MPLS-TP (the Internet) and the Transport Network (ITU inherently MPLS-TP (the Internet) and the Transport Network (ITU
telecommunication Sector), the terminology used is different. telecommunication Sector), the terminology used is different.
This document provides a thesaurus for the interpretation of ITU-T This document provides a thesaurus for the interpretation of ITU-T
Transport Network terminology within the context of the MPLS-TP. Transport Network terminology within the context of the MPLS-TP.
This allows MPLS-TP documents to be generally understood by those This allows MPLS-TP documents to be generally understood by those
familiar with MPLS RFCs. The definitions presented in this document familiar with MPLS RFCs. The definitions presented in this document
do not provide exclusive or complete interpretations of the ITU-T do not provide exclusive or complete interpretations of the ITU-T
Transport Network concepts. Transport Network concepts.
1.1. Contributing Authors 1.1 Contributing Authors
Italo Busi, Ben Niven-Jenkins, Enrique Hernandez-Valencia, Lieven Italo Busi, Ben Niven-Jenkins, Enrique Hernandez-Valencia, Lieven
Levrau, Dinesh Mohan, Stuart Bryant, Dan Frost, Matthew Bocci, Levrau, Dinesh Mohan, Stuart Bryant, Dan Frost, Matthew Bocci,
Vincenzo Sestito, Vigoureux, Yaacov Weingarten Vincenzo Sestito, Vigoureux, Yaacov Weingarten
1.2. Abbreviations 1.2 Abbreviations
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
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MIP Maintenance Entity Group Intermediate Point MIP Maintenance Entity Group Intermediate Point
MPLS Multiprotocol Label Switching MPLS Multiprotocol Label Switching
MPLS-TP MPLS Transport Profile MPLS-TP MPLS Transport Profile
NE Network Element NE Network Element
OAM Operations, Administration and Maintenance OAM Operations, Administration and Maintenance
PM Performance Monitoring
PST Path Segment Tunnel PST Path Segment Tunnel
SCC Signaling Communication Channel SCC Signaling Communication Channel
SCN Signaling Communication Network SCN Signaling Communication Network
SPME Sub-Path Maintenance Element SPME Sub-Path Maintenance Element
TCM Tandem Connection Monitoring TCM Tandem Connection Monitoring
2. Terminology 2 Terminology
2.1. MPLS-TP Terminology Sources 2.1 MPLS-TP Terminology Sources
MPLS-TP terminology is principally defined in [RFC3031]. Other MPLS-TP terminology is principally defined in [RFC3031]. Other
documents provide further key definitions including [RFC4397]. documents provide further key definitions including [RFC4397].
2.2. ITU-T Transport Network Terminology Sources 2.2 ITU-T Transport Network Terminology Sources
The ITU-T Transport Network is specified in a number of The ITU-T Transport Network is specified in a number of
recommendations: generic functional architectures and requirements recommendations: generic functional architectures and requirements
are specified in [ITU-T_G.805], [ITU-T_G.806], and [ITU-T_G.872]. are specified in [ITU-T_G.805], [ITU-T_G.806], and [ITU-T_G.872].
ITU-T Recommendation [ITU-T_G.8101] contains an overview of the ITU-T Recommendation [ITU-T_G.8101] contains an overview of the
Terms and Definitions for transport MPLS. Terms and Definitions for transport MPLS.
2.3. Common Terminology Sources 2.3 Common Terminology Sources
The work in this document builds on the shared view of MPLS The work in this document builds on the shared view of MPLS
requirements. requirements.
The following sources are used: The following sources are used:
IETF framework and requirements RFCs: [RFC6371], [RFC6372], IETF framework and requirements RFCs: [RFC6371], [RFC6372],
[RFC5654], [RFC5921], [RFC5860], [RFC5951], [RFC3031] and [RFC4397]. [RFC5654], [RFC5921], [RFC5860], [RFC5951], [RFC3031] and [RFC4397].
ITU-T architecture and requirements Recommendations: [ITU-T_G.8101], ITU-T architecture and requirements Recommendations: [ITU-T_G.8101],
[ITU-T_G.805], [ITU-T_G.806], [ITU-T_G.872], [ITU-T G.7710] and [ITU-T_G.805], [ITU-T_G.806], [ITU-T_G.872], [ITU-T G.7710] and
[ITU-T Y.2611]. [ITU-T Y.2611].
3. Thesaurus 3 Thesaurus
3.1. Associated bidirectional path: 3.1 Associated bidirectional path:
A path that supports traffic flow in both directions but that is A path that supports traffic flow in both directions but that is
constructed from a pair of unidirectional paths (one for each constructed from a pair of unidirectional paths (one for each
direction) that are associated with one another at the path's direction) that are associated with one another at the path's
ingress/egress points. The forward and backward directions are ingress/egress points. The forward and backward directions are
setup, monitored, and protected independently. As a consequence, setup, monitored, and protected independently. As a consequence,
they may or may not follow the same route (links and nodes) across they may or may not follow the same route (links and nodes) across
the network. the network.
3.2. Bidirectional path: 3.2 Bidirectional path:
A path that supports traffic flow in two opposite directions, i.e. A path that supports traffic flow in two opposite directions, i.e.
the forward and backward direction. the forward and backward direction.
3.3. Client layer network: 3.3 Client layer network:
In a client/server relationship (see [ITU-T_G.805]), the client In a client/server relationship (see [ITU-T_G.805]), the client
layer network receives a (transport) service from the lower server layer network receives a (transport) service from the lower server
layer network (usually the layer network under consideration). layer network (usually the layer network under consideration).
3.4. Communication Channel (CC): 3.4 Communication Channel (CC):
A logical channel between network elements (NEs) that can be used - A logical channel between network elements (NEs) that can be used -
e.g. - for management plane application or control plane e.g. - for management plane application or control plane
applications. The physical channel supporting the CC is technology applications. The physical channel supporting the CC is technology
specific. See [RFC5951] APPENDIX A. specific. See [RFC5951] APPENDIX A.
3.5. Concatenated Segment: 3.5 Concatenated Segment:
A serial-compound link connection as defined in [ITU-T_G.805]. A A serial-compound link connection as defined in [ITU-T_G.805]. A
concatenated segment is a contiguous part of an LSP or multi-segment concatenated segment is a contiguous part of an LSP or multi-segment
PW that comprises a set of segments and their interconnecting nodes PW that comprises a set of segments and their interconnecting nodes
in sequence. See also "Segment". in sequence. See also "Segment".
3.6. Control Plane: 3.6 Control Plane:
Within the scope of [RFC5654], the control plane performs transport Within the scope of [RFC5654], the control plane performs transport
path control functions. Through signalling, the control plane sets path control functions. Through signalling, the control plane sets
up, modifies and releases transport paths, and may recover a up, modifies and releases transport paths, and may recover a
transport path in case of a failure. The control plane also transport path in case of a failure. The control plane also
performs other functions in support of transport path control, such performs other functions in support of transport path control, such
as routing information dissemination. as routing information dissemination.
3.7. Co-routed bidirectional path: 3.7 Co-routed bidirectional path:
A path where the forward and backward directions follow the same A path where the forward and backward directions follow the same
route (links and nodes) across the network. Both directions are route (links and nodes) across the network. Both directions are
setup, monitored and protected as a single entity. A transport setup, monitored and protected as a single entity. A transport
network path is typically co-routed. network path is typically co-routed.
3.8. Data Communication Network (DCN): 3.8 Data Communication Network (DCN):
A network that supports Layer 1 (physical layer), Layer 2 (data-link A network that supports Layer 1 (physical layer), Layer 2 (data-link
layer), and Layer 3 (network layer) functionality for distributed layer), and Layer 3 (network layer) functionality for distributed
management communications related to the management plane, for management communications related to the management plane, for
distributed signaling communications related to the control plane, distributed signaling communications related to the control plane,
and other operations communications (e.g., order-wire/voice and other operations communications (e.g., order-wire/voice
communications, software downloads, etc.). communications, software downloads, etc.).
3.9. Defect: 3.9 Defect:
The situation for which the density of anomalies has reached a level The situation for which the density of anomalies has reached a level
where the ability to perform a required function has been where the ability to perform a required function has been
interrupted. Defects are used as input for PM, the control of interrupted. Defects are used as input for Performance Monitoring
consequent actions, and the determination of fault cause. See also (PM), the control of consequent actions, and the determination of
[ITU-T_G.806]. fault cause. See also [ITU-T_G.806].
3.10. Domain: 3.10 Domain:
A domain represents a collection of entities (for example network A domain represents a collection of entities (for example network
elements) that are grouped for a particular purpose, examples of elements) that are grouped for a particular purpose, examples of
which are administrative and/or managerial responsibilities, trust which are administrative and/or managerial responsibilities, trust
relationships, addressing schemes, infrastructure capabilities, relationships, addressing schemes, infrastructure capabilities,
aggregation, survivability techniques, distributions of control aggregation, survivability techniques, distributions of control
functionality, etc. Examples of such domains include IGP areas and functionality, etc. Examples of such domains include IGP areas and
Autonomous Systems. Autonomous Systems.
3.11. Embedded Communication Channel (ECC): 3.11 Embedded Communication Channel (ECC):
A logical operations channel between network elements (NEs) that can A logical operations channel between network elements (NEs) that can
be utilized by multiple applications (e.g., management plane be utilized by multiple applications (e.g., management plane
applications, control plane applications, etc.). The physical applications, control plane applications, etc.). The physical
channel supporting the ECC is technology specific. An example of channel supporting the ECC is technology specific. An example of
physical channels supporting the ECC is a DCC channel within SDH. physical channels supporting the ECC is a DCC channel within SDH.
3.12. Equipment Management Function (EMF): 3.12 Equipment Management Function (EMF):
The management functions within an NE. See [ITU-T G.7710]. The management functions within an NE. See [ITU-T G.7710].
3.13. Failure: 3.13 Failure:
The fault cause persisted long enough to consider the ability of an The fault cause persisted long enough to consider the ability of an
item to perform a required function to be terminated. The item may item to perform a required function to be terminated. The item may
be considered as failed; a fault has now been detected. See also be considered as failed; a fault has now been detected. See also
[ITU-T_G.806]. [ITU-T_G.806].
3.14. Fault: 3.14 Fault:
A Fault is the inability of a function to perform a required action. A Fault is the inability of a function to perform a required action.
This does not include an inability due to preventive maintenance, This does not include an inability due to preventive maintenance,
lack of external resources, or planned actions. See also [ITU- lack of external resources, or planned actions. See also [ITU-
T_G.806]. T_G.806].
3.15. Layer network: 3.15 Layer network:
Layer network is defined in [ITU-T_G.805]. A layer network provides Layer network is defined in [ITU-T_G.805]. A layer network provides
for the transfer of client information and independent operation of for the transfer of client information and independent operation of
the client OAM. A layer network may be described in a service the client OAM. A layer network may be described in a service
context as follows: one layer network may provide a (transport) context as follows: one layer network may provide a (transport)
service to a higher client layer network and may, in turn, be a service to a higher client layer network and may, in turn, be a
client to a lower-layer network. A layer network is a logical client to a lower-layer network. A layer network is a logical
construction somewhat independent of arrangement or composition of construction somewhat independent of arrangement or composition of
physical network elements. A particular physical network element physical network elements. A particular physical network element
may topologically belong to more than one layer network, depending may topologically belong to more than one layer network, depending
on the actions it takes on the encapsulation associated with the on the actions it takes on the encapsulation associated with the
logical layers (e.g., the label stack), and thus could be modeled as logical layers (e.g., the label stack), and thus could be modeled as
multiple logical elements. A layer network may consist of one or multiple logical elements. A layer network may consist of one or
more sublayers. For additional explanation of how layer networks more sublayers. For additional explanation of how layer networks
relate to the OSI concept of layering, see Appendix I of [ITU-T relate to the OSI concept of layering, see Appendix I of [ITU-T
Y.2611]. Y.2611].
3.16. Link: 3.16 Link:
A physical or logical connection between a pair of LSRs that are A physical or logical connection between a pair of LSRs that are
adjacent at the (sub)layer network under consideration. A link may adjacent at the (sub)layer network under consideration. A link may
carry zero, one or more LSPs or PWs. A packet entering a link will carry zero, one or more LSPs or PWs. A packet entering a link will
emerge with the same label stack entry values. emerge with the same label stack entry values.
A link as defined in [ITU-T_G.805] is used to describe a fixed A link as defined in [ITU-T_G.805] is used to describe a fixed
relationship between two ports. relationship between two ports.
3.17. Maintenance Entity (ME): 3.17 Maintenance Entity (ME):
A Maintenance Entity (ME) can be viewed as the association of two A Maintenance Entity (ME) can be viewed as the association of two
(or more) Maintenance Entity Group End Points (MEPs), that should be (or more) Maintenance Entity Group End Points (MEPs), that should be
configured and managed in order to bound the OAM responsibilities of configured and managed in order to bound the OAM responsibilities of
an OAM flow across a network or sub-network, i.e. a transport path an OAM flow across a network or sub-network, i.e. a transport path
or segment, in the specific layer network that is being monitored or segment, in the specific layer network that is being monitored
and managed. See also [RFC6371] section 3.1 and [ITU-T G.8113.1], and managed. See also [RFC6371] section 3.1 and [ITU-T G.8113.1],
[ITU-T G.8113.2] clause 6.1. [ITU-T G.8113.2] clause 6.1.
A Maintenance Entity may be defined to monitor and manage A Maintenance Entity may be defined to monitor and manage
bidirectional or unidirectional point-to-point connectivity or bidirectional or unidirectional point-to-point connectivity or
point-to-multipoint connectivity in an MPLS-TP layer network. point-to-multipoint connectivity in an MPLS-TP layer network.
Therefore, in the context of MPLS-TP LSP or PW Maintenance Entity Therefore, in the context of MPLS-TP LSP or PW Maintenance Entity
(defined below) LERs and T-PEs can be MEPs while LSRs and S-PEs can (defined below) LERs and T-PEs can be MEPs while LSRs and S-PEs can
be MIPs. In the case of Tandem Connection Maintenance Entity be MIPs. In the case of Tandem Connection Maintenance Entity
(defined below), LSRs and S-PEs can be either MEPs or MIPs. (defined below), LSRs and S-PEs can be either MEPs or MIPs.
The following properties apply to all MPLS-TP MEs: The following properties apply to all MPLS-TP MEs:
o OAM entities can be nested but not overlapped. OAM entities can be nested but not overlapped.
o Each OAM flow is associated to a unique Maintenance Entity. Each OAM flow is associated to a unique Maintenance Entity.
o OAM packets are subject to the same forwarding treatment as the OAM packets are subject to the same forwarding treatment as the data
data traffic, but they are distinct from the data traffic. traffic, but they are distinct from the data traffic.
3.18. Maintenance Entity Group (MEG): 3.18 Maintenance Entity Group (MEG):
A Maintenance Entity Group is defined, for the purpose of connection A Maintenance Entity Group is defined, for the purpose of connection
monitoring, between a set of connection points within a connection. monitoring, between a set of connection points within a connection.
This set of connection points may be located at the boundary of one This set of connection points may be located at the boundary of one
administrative domain or a protection domain, or the boundaries of administrative domain or a protection domain, or the boundaries of
two adjacent administrative domains. The MEG may consist of one or two adjacent administrative domains. The MEG may consist of one or
more Maintenance Entities (ME). See also [RFC6371] section 3.1 and more Maintenance Entities (ME). See also [RFC6371] section 3.1 and
[ITU-T G.8113.1], [ITU-T G.8113.2] clause 6.2. [ITU-T G.8113.1], [ITU-T G.8113.2] clause 6.2.
In an MPLS-TP layer network a MEG consists of only one ME. In an MPLS-TP layer network a MEG consists of only one ME.
3.19. Maintenance Entity Group End Point (MEP): 3.19 Maintenance Entity Group End Point (MEP):
Maintenance Entity Group End Points (MEPs) are the end points of a Maintenance Entity Group End Points (MEPs) are the end points of a
pre-configured (through the management or control planes) ME. MEPs pre-configured (through the management or control planes) ME. MEPs
are responsible for activating and controlling all of the OAM are responsible for activating and controlling all of the OAM
functionality for the ME. A source MEP may initiate an OAM packet to functionality for the ME. A source MEP may initiate an OAM packet to
be transferred to its corresponding peer or sink MEP, or to an be transferred to its corresponding peer or sink MEP, or to an
intermediate MIP that is part of the ME. See also [RFC6371] section intermediate MIP that is part of the ME. See also [RFC6371] section
3.3 and [ITU-T G.8113.1], [ITU-T G.8113.2] clause 6.3. 3.3 and [ITU-T G.8113.1], [ITU-T G.8113.2] clause 6.3.
A sink MEP terminates all the OAM packets that it receives A sink MEP terminates all the OAM packets that it receives
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A MEP in a tandem connection is not coincident with the termination A MEP in a tandem connection is not coincident with the termination
of the MPLS-TP transport path (LSP or PW), though it can monitor its of the MPLS-TP transport path (LSP or PW), though it can monitor its
connectivity (e.g. count packets). A MEP of an MPLS-TP network connectivity (e.g. count packets). A MEP of an MPLS-TP network
transport path is coincident with transport path termination and transport path is coincident with transport path termination and
monitors its connectivity (e.g. count packets). monitors its connectivity (e.g. count packets).
An MPLS-TP sink MEP can notify a fault condition to its MPLS-TP An MPLS-TP sink MEP can notify a fault condition to its MPLS-TP
client layer network. client layer network.
3.20. Maintenance Entity Group Intermediate Point (MIP): 3.20 Maintenance Entity Group Intermediate Point (MIP):
A Maintenance Entity Group Intermediate Point (MIP) is a point A Maintenance Entity Group Intermediate Point (MIP) is a point
between the two MEPs in an ME and is capable of responding to some between the two MEPs in an ME and is capable of responding to some
OAM packets and forwarding all OAM packets while ensuring fate OAM packets and forwarding all OAM packets while ensuring fate
sharing with data plane packets. A MIP responds only to OAM packets sharing with data plane packets. A MIP responds only to OAM packets
that are sent on the ME it belongs to and that are addressed to the that are sent on the ME it belongs to and that are addressed to the
MIP, it does not initiate OAM messages. See also [RFC6371] section MIP, it does not initiate OAM messages. See also [RFC6371] section
3.4 and [ITU-T G.8113.1], [ITU-T G.8113.2] clause 6.4. 3.4 and [ITU-T G.8113.1], [ITU-T G.8113.2] clause 6.4.
3.21. Management Communication Channel (MCC): 3.21 Management Communication Channel (MCC):
A CC dedicated for management plane communications. A CC dedicated for management plane communications.
3.22. Management Communication Network (MCN): 3.22 Management Communication Network (MCN):
A DCN supporting management plane communication is referred to as a A DCN supporting management plane communication is referred to as a
Management Communication Network (MCN). Management Communication Network (MCN).
3.23. Monitoring 3.23 Monitoring
Monitoring is applying OAM functionality to verify and to maintain Monitoring is applying OAM functionality to verify and to maintain
the performance and the quality guarantees of a transport path. the performance and the quality guarantees of a transport path.
There is a need to not only monitor the whole transport path (e.g. There is a need to not only monitor the whole transport path (e.g.
LSP or MS-PW), but also arbitrary parts of transport paths. The LSP or MS-PW), but also arbitrary parts of transport paths. The
connection between any two arbitrary points along a transport path connection between any two arbitrary points along a transport path
is described in three ways: is described in three ways:
- as a Path Segment Tunnel, - as a Path Segment Tunnel,
- as a Sub-Path Maintenance Element, and - as a Sub-Path Maintenance Element, and
- as a Tandem Connections. - as a Tandem Connections.
3.23.1. Path Segment Tunnel (PST): 3.23.1 Path Segment Tunnel (PST):
A path segment is either a segment or a concatenated segment. Path A path segment is either a segment or a concatenated segment. Path
Segment Tunnels (PSTs) are instantiated to provide monitoring of a Segment Tunnels (PSTs) are instantiated to provide monitoring of a
portion of a set of co-routed transport paths (LSPs or MS-PWs). portion of a set of co-routed transport paths (LSPs or MS-PWs).
Path segment tunnels can also be employed to meet the requirement to Path segment tunnels can also be employed to meet the requirement to
provide Tandem Connection Monitoring, see Tandem Connection. provide Tandem Connection Monitoring, see Tandem Connection.
3.23.2. Sub-Path Maintenance Element (SMPE): 3.23.2 Sub-Path Maintenance Element (SMPE):
To monitor, protect, and manage a portion (i.e., segment or To monitor, protect, and manage a portion (i.e., segment or
concatenated segment) of an LSP, a hierarchical LSP [RFC3031] can be concatenated segment) of an LSP, a hierarchical LSP [RFC3031] can be
instantiated. A hierarchical LSP instantiated for this purpose is instantiated. A hierarchical LSP instantiated for this purpose is
called a Sub-Path Maintenance Element (SPME). Note that by called a Sub-Path Maintenance Element (SPME). Note that by
definition an SPME does not carry user traffic as a direct client. definition an SPME does not carry user traffic as a direct client.
An SPME is defined between the edges of the portion of the LSP that An SPME is defined between the edges of the portion of the LSP that
needs to be monitored, protected or managed. The SPME forms a MPLS- needs to be monitored, protected or managed. The SPME forms a MPLS-
TP Section that carries the original LSP over this portion of the TP Section that carries the original LSP over this portion of the
network as a client. OAM messages can be initiated at the edge of network as a client. OAM messages can be initiated at the edge of
the SPME and sent to the peer edge of the SPME or to a MIP along the the SPME and sent to the peer edge of the SPME or to a MIP along the
SPME. A P router only pushes or pops a label if it is at the end of SPME. A P router only pushes or pops a label if it is at the end of
a SPME. In this mode, it is an LER for the SPME. a SPME. In this mode, it is an LER for the SPME.
3.23.3. Tandem Connection: 3.23.3 Tandem Connection:
A tandem connection is an arbitrary part of a transport path that A tandem connection is an arbitrary part of a transport path that
can be monitored (via OAM) independently from the end-to-end can be monitored (via OAM) independently from the end-to-end
monitoring (OAM). It may be a monitored segment, a monitored monitoring (OAM). It may be a monitored segment, a monitored
concatenated segment or any other monitored ordered sequence of concatenated segment or any other monitored ordered sequence of
contiguous hops and/or segments (and their interconnecting nodes) of contiguous hops and/or segments (and their interconnecting nodes) of
a transport path. a transport path.
Tandem Connection Monitoring (TCM) for a given path segment of a Tandem Connection Monitoring (TCM) for a given path segment of a
transport path is implemented by creating a path segment tunnel that transport path is implemented by creating a path segment tunnel that
has a 1:1 association with the path segment of the transport path has a 1:1 association with the path segment of the transport path
that is to be uniquely monitored. This means that the PST used to that is to be uniquely monitored. This means that the PST used to
provide TCM can carry one and only one transport path thus allowing provide TCM can carry one and only one transport path thus allowing
direct correlation between all fault management and performance direct correlation between all fault management and performance
monitoring information gathered for the PST and the monitored path monitoring information gathered for the PST and the monitored path
segment of the end-to-end transport path. The PST is monitored segment of the end-to-end transport path. The PST is monitored
using normal LSP monitoring. See also [RFC6371] section 3.2 and using normal LSP monitoring. See also [RFC6371] section 3.2 and
[ITU-T G.8113.1], [ITU-T G.8113.2] clause 6.2.1. [ITU-T G.8113.1], [ITU-T G.8113.2] clause 6.2.1.
3.24. MPLS Section: 3.24 MPLS Section:
A network segment between two LSRs that are immediately adjacent at A network segment between two LSRs that are immediately adjacent at
the MPLS layer. the MPLS layer.
3.25. MPLS Transport Profile (MPLS-TP): 3.25 MPLS Transport Profile (MPLS-TP):
The set of MPLS functions used to support packet transport services The set of MPLS functions used to support packet transport services
and network operations. and network operations.
3.26. MPLS-TP NE: 3.26 MPLS-TP NE:
A network element (NE) that supports MPLS-TP functions. A network element (NE) that supports MPLS-TP functions.
3.27. MPLS-TP network: 3.27 MPLS-TP network:
A network in which MPLS-TP NEs are deployed. A network in which MPLS-TP NEs are deployed.
3.28. MPLS-TP Recovery: 3.28 MPLS-TP Recovery:
3.28.1. End-to-end recovery: 3.28.1 End-to-end recovery:
MPLS-TP End-to-end recovery refers to the recovery of an entire LSP, MPLS-TP End-to-end recovery refers to the recovery of an entire LSP,
from its ingress to its egress node. from its ingress to its egress node.
3.28.2. Link recovery: 3.28.2 Link recovery:
MPLS-TP link recovery refers to the recovery of an individual link MPLS-TP link recovery refers to the recovery of an individual link
(and hence all or a subset of the LSPs routed over the link) between (and hence all or a subset of the LSPs routed over the link) between
two MPLS-TP nodes. For example, link recovery may be provided by two MPLS-TP nodes. For example, link recovery may be provided by
server layer recovery. server layer recovery.
3.28.3. Segment recovery: 3.28.3 Segment recovery:
MPLS-TP Segment recovery refers to the recovery of an LSP segment MPLS-TP Segment recovery refers to the recovery of an LSP segment
(i.e., segment and concatenated segment in the language of (i.e., segment and concatenated segment in the language of
[RFC5654]) between two nodes and is used to recover from the failure [RFC5654]) between two nodes and is used to recover from the failure
of one or more links or nodes. of one or more links or nodes.
3.29. MPLS-TP Ring Topology: 3.29 MPLS-TP Ring Topology:
In an MPLS-TP ring topology, each LSR is connected to exactly two In an MPLS-TP ring topology, each LSR is connected to exactly two
other LSRs, each via a single point-to-point bidirectional MPLS-TP other LSRs, each via a single point-to-point bidirectional MPLS-TP
capable link. A ring may also be constructed from only two LSRs capable link. A ring may also be constructed from only two LSRs
where there are also exactly two links. Rings may be connected to where there are also exactly two links. Rings may be connected to
other LSRs to form a larger network. Traffic originating or other LSRs to form a larger network. Traffic originating or
terminating outside the ring may be carried over the ring. Client terminating outside the ring may be carried over the ring. Client
network nodes (such as Customer Edges (CEs)) may be connected network nodes (such as Customer Edges (CEs)) may be connected
directly to an LSR in the ring. directly to an LSR in the ring.
3.29.1. MPLS-TP Logical Ring: 3.29.1 MPLS-TP Logical Ring:
An MPLS-TP logical ring is constructed from a set of LSRs and An MPLS-TP logical ring is constructed from a set of LSRs and
logical data links (such as MPLS-TP LSP tunnels or MSPL-TP logical data links (such as MPLS-TP LSP tunnels or MSPL-TP
pseudowires) and physical data links that form a ring topology. pseudowires) and physical data links that form a ring topology.
3.29.2. MPLS-TP Physical Ring: 3.29.2 MPLS-TP Physical Ring:
An MPLS-TP physical ring is constructed from a set of LSRs and An MPLS-TP physical ring is constructed from a set of LSRs and
physical data links that form a ring topology. physical data links that form a ring topology.
3.30. OAM flow: 3.30 OAM flow:
An OAM flow is the set of all OAM packets originating with a An OAM flow is the set of all OAM packets originating with a
specific source MEP that instrument one direction of a MEG (or specific source MEP that instrument one direction of a MEG (or
possibly both in the special case of data plane loopback). possibly both in the special case of data plane loopback).
3.31. Operations System (OS): 3.31 Operations System (OS):
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. Protection priority: 3.33 Protection priority:
Fault conditions (e.g., signal failed), external commands (e.g, Fault conditions (e.g., signal failed), external commands (e.g,
forced switch, manual switch) and protection states (e.g., no forced switch, manual switch) and protection states (e.g., no
request) are defined to have a relative priority with respect to request) are defined to have a relative priority with respect to
each other. Priority is applied to these conditions/command/states each other. Priority is applied to these conditions/command/states
locally at each endpoint and between the two endpoints. locally at each endpoint and between the two endpoints.
3.34. Section Layer Network: 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.
3.35. 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".
3.36. Server layer: 3.36 Server layer:
A service layer is a layer network in which transport paths are used A server 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).
3.37. 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
skipping to change at page 15, line 22 skipping to change at page 15, line 22
. 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.
3.38. 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).
3.39. 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).
3.40. Span: 3.40 Span:
A span is synonymous with a link. A span is synonymous with a link.
3.41. 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.
3.42. 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.
3.42.1. 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.
3.42.2. 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.
3.42.3. 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.
3.43. 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.
3.44. 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.
3.45. 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.
3.46. 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.
3.47. 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).
3.48. 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
use the features and functions of the Transport Network in order to use the features and functions of the Transport Network in order to
meet the requirements of MPLS-TP. meet the requirements of MPLS-TP.
This lexicography should not be used in order to obtain or derive This lexicography should not be used in order to obtain or derive
definitive definitions of GMPLS terms. To obtain definitions of definitive definitions of GMPLS terms. To obtain definitions of
GMPLS terms that are applicable across all GMPLS architectural GMPLS terms that are applicable across all GMPLS architectural
models, the reader should refer to the RFCs listed in the references models, the reader should refer to the RFCs listed in the references
sections of this document. [RFC3945] provides an overview of the sections of this document. [RFC3945] provides an overview of the
GMPLS architecture and should be read first. GMPLS architecture and should be read first.
5. Management Considerations 5 Management Considerations
The MPLS-TP based network requires management. The MPLS-TP The MPLS-TP based network requires management. The MPLS-TP
specifications described in [RFC5654], [RFC5860], [RFC5921], specifications described in [RFC5654], [RFC5860], [RFC5921],
[RFC5951], [RFC6371], [RFC6372], [ITU-T G.8110.1] and [ITU-T [RFC5951], [RFC6371], [RFC6372], [ITU-T G.8110.1] and [ITU-T
G.7710], include considerable efforts to provide operator control G.7710], include considerable efforts to provide operator control
and monitoring, as well as Operations, Administration and and monitoring, as well as Operations, Administration and
Maintenance (OAM) functionality. Maintenance (OAM) functionality.
These concepts are, however, out of scope of this document. These concepts are, however, out of scope of this document.
6. Security Considerations 6 Security Considerations
Security is a significant requirement of MPLS-TP. See for more Security is a significant requirement of MPLS-TP. See for more
information [SECURITY]. information [RFC6941].
However, this informational document is intended only to provide However, this informational document is intended only to provide
lexicography, and the security concerns are, therefore, out of lexicography, and the security concerns are, therefore, out of
scope. scope.
7. IANA Considerations 7 IANA Considerations
There are no IANA actions resulting from this document. There are no IANA actions resulting from this document.
8. Acknowledgments 8 Acknowledgments
The authors would like to thank all members of the teams (the Joint The authors would like to thank all members of the teams (the Joint
Working Team, the MPLS Interoperability Design Team in IETF and the Working Team, the MPLS Interoperability Design Team in IETF and the
MPLS-TP Ad Hoc Group in ITU-T) involved in the definition and MPLS-TP Ad Hoc Group in ITU-T) involved in the definition and
specification of MPLS Transport Profile. specification of MPLS Transport Profile. We would in particular like
to acknowledge the contributions by Tom Petch to improve the quality
of this draft.
9. References 9 References
9.1. Normative References 9.1 Normative References
[RFC3031] E. Rosen, et al., "Requirements of an MPLS Transport [RFC3031] E. Rosen, et al., "Requirements of an MPLS Transport
Profile", January 2001. Profile", January 2001.
[RFC5654] B. Niven-Jenkins, et al., "Requirements of an MPLS [RFC5654] B. Niven-Jenkins, et al., "Requirements of an MPLS
Transport Profile", September 2009. Transport Profile", September 2009.
[RFC5860] Vigoureux, M., Betts, M., Ward, D., "Requirements for OAM [RFC5860] Vigoureux, M., Betts, M., Ward, D., "Requirements for OAM
in MPLS Transport Networks", May 2010. in MPLS Transport Networks", May 2010.
skipping to change at page 20, line 5 skipping to change at page 20, line 5
for MPLS-TP in Packet Transport Network (PTN)." for MPLS-TP in Packet Transport Network (PTN)."
[ITU-T G.8113.2] ITU-T Recommendation G.8113.2/Y.1372.2 (11/2012), [ITU-T G.8113.2] ITU-T Recommendation G.8113.2/Y.1372.2 (11/2012),
"Operations, administration and maintenance mechanisms "Operations, administration and maintenance mechanisms
for MPLS-TP networks using the tools defined for for MPLS-TP networks using the tools defined for
MPLS." MPLS."
[ITU-T Y.2611] ITU-T Recommendation Y.2611 (12/2006), "High-level [ITU-T Y.2611] ITU-T Recommendation Y.2611 (12/2006), "High-level
architecture of future packet-based networks." architecture of future packet-based networks."
9.2. Informative References 9.2 Informative References
[RFC3945] E. Mannie, "Generalized Multi-Protocol Label Switching [RFC3945] E. Mannie, "Generalized Multi-Protocol Label Switching
(GMPLS) Architecture", October 2004. (GMPLS) Architecture", October 2004.
[RFC4397] I. Bryskin, A. Farrel, "A Lexicography for the [RFC4397] I. Bryskin, A. Farrel, "A Lexicography for the
Interpretation of Generalized Multiprotocol Label Interpretation of Generalized Multiprotocol Label
Switching (GMPLS) Terminology within the Context of the Switching (GMPLS) Terminology within the Context of the
ITU-T's Automatically Switched Optical Network (ASON) ITU-T's Automatically Switched Optical Network (ASON)
Architecture", February 2006. Architecture", February 2006.
[SECURITY] L. Fang, B. Niven-Jenkins, S. Mansfield, R. Graveman, [RFC6941] L. Fang, B. Niven-Jenkins, S. Mansfield, R. Graveman,
"MPLS-TP Security Framework", draft-ietf-mpls-tp-security- "MPLS Transport Profile (MPLS-TP) Security Framework",
framework (work in progress). April 2013.
Authors' Addresses Authors' Addresses
Huub van Helvoort (Editor) Huub van Helvoort (Editor)
Huawei Technologies Co., Ltd. Huawei Technologies Co., Ltd.
Email: Huub.van.Helvoort@huawei.com Email: Huub.van.Helvoort@huawei.com
Loa Andersson (Editor) Loa Andersson (Editor)
Huawei Technologies Co., Ltd. Huawei Technologies Co., Ltd.
Email: loa@mail01.huawei.com Email: loa@mail01.huawei.com
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