< draft-ietf-detnet-ip-over-tsn-04.txt   draft-ietf-detnet-ip-over-tsn-05.txt >
DetNet B. Varga, Ed. DetNet B. Varga, Ed.
Internet-Draft J. Farkas Internet-Draft J. Farkas
Intended status: Informational Ericsson Intended status: Informational Ericsson
Expires: May 6, 2021 A. Malis Expires: June 16, 2021 A. Malis
Malis Consulting Malis Consulting
S. Bryant S. Bryant
Futurewei Technologies Futurewei Technologies
November 2, 2020 December 13, 2020
DetNet Data Plane: IP over IEEE 802.1 Time Sensitive Networking (TSN) DetNet Data Plane: IP over IEEE 802.1 Time Sensitive Networking (TSN)
draft-ietf-detnet-ip-over-tsn-04 draft-ietf-detnet-ip-over-tsn-05
Abstract Abstract
This document specifies the Deterministic Networking IP data plane This document specifies the Deterministic Networking IP data plane
when operating over a TSN sub-network. This document does not define when operating over a TSN sub-network. This document does not define
new procedures or processes. Whenever this document makes new procedures or processes. Whenever this document makes
requirements statements or recommendations, these are taken from requirements statements or recommendations, these are taken from
normative text in the referenced RFCs. normative text in the referenced RFCs.
Status of This Memo Status of This Memo
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference 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."
This Internet-Draft will expire on May 6, 2021. This Internet-Draft will expire on June 16, 2021.
Copyright Notice Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the Copyright (c) 2020 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
(https://trustee.ietf.org/license-info) in effect on the date of (https://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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include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License. described in the Simplified BSD License.
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Terms Used In This Document . . . . . . . . . . . . . . . 3 2.1. Terms Used In This Document . . . . . . . . . . . . . . . 3
2.2. Abbreviations . . . . . . . . . . . . . . . . . . . . . . 3 2.2. Abbreviations . . . . . . . . . . . . . . . . . . . . . . 3
2.3. Requirements Language . . . . . . . . . . . . . . . . . . 3
3. DetNet IP Data Plane Overview . . . . . . . . . . . . . . . . 3 3. DetNet IP Data Plane Overview . . . . . . . . . . . . . . . . 3
4. DetNet IP Flows over an IEEE 802.1 TSN sub-network . . . . 4 4. DetNet IP Flows over an IEEE 802.1 TSN sub-network . . . . 4
4.1. Functions for DetNet Flow to TSN Stream Mapping . . . . . 5 4.1. Functions for DetNet Flow to TSN Stream Mapping . . . . . 5
4.2. TSN requirements of IP DetNet nodes . . . . . . . . . . . 6 4.2. TSN requirements of IP DetNet nodes . . . . . . . . . . . 6
4.3. Service protection within the TSN sub-network . . . . . . 8 4.3. Service protection within the TSN sub-network . . . . . . 7
4.4. Aggregation during DetNet flow to TSN Stream mapping . . 8 4.4. Aggregation during DetNet flow to TSN Stream mapping . . 7
5. Management and Control Implications . . . . . . . . . . . . . 8 5. Management and Control Implications . . . . . . . . . . . . . 8
6. Security Considerations . . . . . . . . . . . . . . . . . . . 10 6. Security Considerations . . . . . . . . . . . . . . . . . . . 9
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 10 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 10
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 10 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
9.1. Normative references . . . . . . . . . . . . . . . . . . 10 9.1. Normative references . . . . . . . . . . . . . . . . . . 10
9.2. Informative references . . . . . . . . . . . . . . . . . 11 9.2. Informative references . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction 1. Introduction
Deterministic Networking (DetNet) is a service that can be offered by Deterministic Networking (DetNet) is a service that can be offered by
a network to DetNet flows. DetNet provides these flows extremely low a network to DetNet flows. DetNet provides these flows extremely low
packet loss rates and assured maximum end-to-end delivery latency. packet loss rates and assured maximum end-to-end delivery latency.
General background and concepts of DetNet can be found in the DetNet General background and concepts of DetNet can be found in the DetNet
Architecture [RFC8655]. Architecture [RFC8655].
[I-D.ietf-detnet-ip] specifies the DetNet data plane operation for IP [RFC8939] specifies the DetNet data plane operation for IP hosts and
hosts and routers that provide DetNet service to IP encapsulated routers that provide DetNet service to IP encapsulated data. This
data. This document focuses on the scenario where DetNet IP nodes document focuses on the scenario where DetNet IP nodes are
are interconnected by a TSN sub-network. interconnected by a TSN sub-network.
The DetNet Architecture decomposes the DetNet related data plane The DetNet Architecture decomposes the DetNet related data plane
functions into two sub-layers: a service sub-layer and a forwarding functions into two sub-layers: a service sub-layer and a forwarding
sub-layer. The service sub-layer is used to provide DetNet service sub-layer. The service sub-layer is used to provide DetNet service
protection and reordering. The forwarding sub-layer is used to protection and reordering. The forwarding sub-layer is used to
provides congestion protection (low loss, assured latency, and provides congestion protection (low loss, assured latency, and
limited reordering). As described in [I-D.ietf-detnet-ip] no DetNet limited reordering). As described in [RFC8939] no DetNet specific
specific headers are added to support DetNet IP flows, only the headers are added to support DetNet IP flows, only the forwarding
forwarding sub-layer functions are supported inside the DetNet sub-layer functions are supported inside the DetNet domain. Service
domain. Service protection can be provided on a per sub-network protection can be provided on a per sub-network basis as shown here
basis as shown here for the IEEE802.1 TSN sub-network scenario. for the IEEE802.1 TSN sub-network scenario.
2. Terminology 2. Terminology
2.1. Terms Used In This Document 2.1. Terms Used In This Document
This document uses the terminology and concepts established in the This document uses the terminology and concepts established in the
DetNet architecture [RFC8655], and the reader is assumed to be DetNet architecture [RFC8655], and the reader is assumed to be
familiar with that document and its terminology. familiar with that document and its terminology.
2.2. Abbreviations 2.2. Abbreviations
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L2 Layer-2. L2 Layer-2.
L3 Layer-3. L3 Layer-3.
PREOF Packet Replication, Ordering and Elimination Function. PREOF Packet Replication, Ordering and Elimination Function.
TSN Time-Sensitive Networking, TSN is a Task Group of the TSN Time-Sensitive Networking, TSN is a Task Group of the
IEEE 802.1 Working Group. IEEE 802.1 Working Group.
2.3. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
3. DetNet IP Data Plane Overview 3. DetNet IP Data Plane Overview
[I-D.ietf-detnet-ip] describes how IP is used by DetNet nodes, i.e., [RFC8939] describes how IP is used by DetNet nodes, i.e., hosts and
hosts and routers, to identify DetNet flows and provide a DetNet routers, to identify DetNet flows and provide a DetNet service. From
service. From a data plane perspective, an end-to-end IP model is a data plane perspective, an end-to-end IP model is followed. DetNet
followed. DetNet uses "6-tuple" based flow identification, where uses "6-tuple" based flow identification, where "6-tuple" refers to
"6-tuple" refers to information carried in IP and higher layer information carried in IP and higher layer protocol headers.
protocol headers.
DetNet flow aggregation may be enabled via the use of wildcards, DetNet flow aggregation may be enabled via the use of wildcards,
masks, prefixes and ranges. IP tunnels may also be used to support masks, prefixes and ranges. IP tunnels may also be used to support
flow aggregation. In these cases, it is expected that DetNet aware flow aggregation. In these cases, it is expected that DetNet aware
intermediate nodes will provide DetNet service assurance on the intermediate nodes will provide DetNet service assurance on the
aggregate through resource allocation and congestion control aggregate through resource allocation and congestion control
mechanisms. mechanisms.
Congestion protection, latency control and the resource allocation Congestion protection, latency control and the resource allocation
(queuing, policing, shaping) are supported using the underlying link (queuing, policing, shaping) are supported using the underlying link
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DetNet flow and TSN Stream mapping related information are required DetNet flow and TSN Stream mapping related information are required
only for TSN-aware IP (DetNet) nodes. From the Data Plane only for TSN-aware IP (DetNet) nodes. From the Data Plane
perspective there is no practical difference based on the origin of perspective there is no practical difference based on the origin of
flow mapping related information (management plane or control plane). flow mapping related information (management plane or control plane).
The following summarizes the set of information that is needed to The following summarizes the set of information that is needed to
configure DetNet IP over TSN: configure DetNet IP over TSN:
o DetNet IP related configuration information according to the o DetNet IP related configuration information according to the
DetNet role of the DetNet IP node, as per [I-D.ietf-detnet-ip]. DetNet role of the DetNet IP node, as per [RFC8939].
o TSN related configuration information according to the TSN role of o TSN related configuration information according to the TSN role of
the DetNet IP node, as per [IEEE8021Q], [IEEE8021CB] and the DetNet IP node, as per [IEEE8021Q], [IEEE8021CB] and
[IEEEP8021CBdb]. [IEEEP8021CBdb].
o Mapping between DetNet IP flow(s) (as flow identification defined o Mapping between DetNet IP flow(s) (as flow identification defined
in [I-D.ietf-detnet-ip], it is summarized in Section 5.1 of that in [RFC8939], it is summarized in Section 5.1 of that document,
document, and includes all wildcards, port ranges and the ability and includes all wildcards, port ranges and the ability to ignore
to ignore specific IP fields) and TSN Stream(s) (as stream specific IP fields) and TSN Stream(s) (as stream identification
identification information defined in [IEEE8021CB] and information defined in [IEEE8021CB] and [IEEEP8021CBdb]). Note,
[IEEEP8021CBdb]). Note, that managed objects for TSN Stream that managed objects for TSN Stream identification can be found in
identification can be found in [IEEEP8021CBcv]. [IEEEP8021CBcv].
This information must be provisioned per DetNet flow. This information must be provisioned per DetNet flow.
Mappings between DetNet and TSN management and control planes are out Mappings between DetNet and TSN management and control planes are out
of scope of the document. Some of the challanges are highligthed of scope of the document. Some of the challanges are highligthed
below. below.
TSN-aware IP DetNet nodes are member of both the DetNet domain and TSN-aware IP DetNet nodes are member of both the DetNet domain and
the TSN sub-network. Within the TSN sub-network the TSN-aware IP the TSN sub-network. Within the TSN sub-network the TSN-aware IP
(DetNet) node has a TSN-aware Talker/Listener role, so TSN specific (DetNet) node has a TSN-aware Talker/Listener role, so TSN specific
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Configuration of TSN specific functions (e.g., FRER) inside the TSN Configuration of TSN specific functions (e.g., FRER) inside the TSN
sub-network is a TSN domain specific decision and may not be visible sub-network is a TSN domain specific decision and may not be visible
in the DetNet domain. in the DetNet domain.
6. Security Considerations 6. Security Considerations
Security considerations for DetNet are described in detail in Security considerations for DetNet are described in detail in
[I-D.ietf-detnet-security]. General security considerations are [I-D.ietf-detnet-security]. General security considerations are
described in [RFC8655]. DetNet IP data plane specific considerations described in [RFC8655]. DetNet IP data plane specific considerations
are summarized in [I-D.ietf-detnet-ip]. This section considers are summarized in [RFC8939]. This section considers exclusively
exclusively security considerations which are specific to the DetNet security considerations which are specific to the DetNet IP over TSN
IP over TSN sub-network scenario. sub-network scenario.
The sub-network between DetNet nodes needs to be subject to The sub-network between DetNet nodes needs to be subject to
appropriate confidentiality. Additionally, knowledge of what DetNet/ appropriate confidentiality. Additionally, knowledge of what DetNet/
TSN services are provided by a sub-network may supply information TSN services are provided by a sub-network may supply information
that can be used in a variety of security attacks. The ability to that can be used in a variety of security attacks. The ability to
modify information exchanges between connected DetNet nodes may modify information exchanges between connected DetNet nodes may
result in bogus operations. Therefore, it is important that the result in bogus operations. Therefore, it is important that the
interface between DetNet nodes and TSN sub-network are subject to interface between DetNet nodes and TSN sub-network are subject to
authorization, authentication, and encryption. authorization, authentication, and encryption.
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8. Acknowledgements 8. Acknowledgements
The authors wish to thank Norman Finn, Lou Berger, Craig Gunther, The authors wish to thank Norman Finn, Lou Berger, Craig Gunther,
Christophe Mangin and Jouni Korhonen for their various contributions Christophe Mangin and Jouni Korhonen for their various contributions
to this work. to this work.
9. References 9. References
9.1. Normative references 9.1. Normative references
[I-D.ietf-detnet-ip] [RFC8939] Varga, B., Ed., Farkas, J., Berger, L., Fedyk, D., and S.
Varga, B., Farkas, J., Berger, L., Fedyk, D., and S. Bryant, "Deterministic Networking (DetNet) Data Plane:
Bryant, "DetNet Data Plane: IP", draft-ietf-detnet-ip-07 IP", RFC 8939, DOI 10.17487/RFC8939, November 2020,
(work in progress), July 2020. <https://www.rfc-editor.org/info/rfc8939>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
9.2. Informative references 9.2. Informative references
[I-D.ietf-detnet-flow-information-model]
Varga, B., Farkas, J., Cummings, R., Jiang, Y., and D.
Fedyk, "DetNet Flow Information Model", draft-ietf-detnet-
flow-information-model-11 (work in progress), October
2020.
[I-D.ietf-detnet-security] [I-D.ietf-detnet-security]
Grossman, E., Mizrahi, T., and A. Hacker, "Deterministic Grossman, E., Mizrahi, T., and A. Hacker, "Deterministic
Networking (DetNet) Security Considerations", draft-ietf- Networking (DetNet) Security Considerations", draft-ietf-
detnet-security-12 (work in progress), October 2020. detnet-security-12 (work in progress), October 2020.
[IEEE802.1AE-2018] [IEEE802.1AE-2018]
IEEE Standards Association, "IEEE Std 802.1AE-2018 MAC IEEE Standards Association, "IEEE Std 802.1AE-2018 MAC
Security (MACsec)", 2018, Security (MACsec)", 2018,
<https://ieeexplore.ieee.org/document/8585421>. <https://ieeexplore.ieee.org/document/8585421>.
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