RFC 9024 | TSN over DetNet MPLS | June 2021
Varga, et al. | Standards Track | [Page]

Stream:
  Internet Engineering Task Force (IETF)
RFC:
  9024
Category:
  Standards Track
Published:
  June 2021
ISSN:
  2070-1721
Authors:
  B. Varga, Ed.
  Ericsson
  J. Farkas
  Ericsson
  A. Malis
  Malis Consulting
  S. Bryant
  Futurewei Technologies
  D. Fedyk
  LabN Consulting, L.L.C.

# RFC 9024

# Deterministic Networking (DetNet) Data Plane: IEEE 802.1 Time-Sensitive Networking over MPLS

## Abstract

This document specifies the Deterministic Networking data plane when Time-Sensitive Networking (TSN) networks are interconnected over a DetNet MPLS network.¶

## Status of This Memo

This is an Internet Standards Track document.¶

This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 7841.¶

Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at https://www.rfc-editor.org/info/rfc9024.¶

## Copyright Notice

Copyright (c) 2021 IETF Trust and the persons identified as the document authors. All rights reserved.¶

This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License.¶

## 1. Introduction

The Time-Sensitive Networking Task Group (TSN TG) within the IEEE 802.1 Working Group deals with deterministic services through IEEE 802 networks. Deterministic Networking (DetNet) defined by the IETF is a service that can be offered by an L3 network to DetNet flows. General background and concepts of DetNet can be found in [RFC8655].¶

This document specifies the use of a DetNet MPLS network to interconnect TSN nodes/network segments. The DetNet MPLS data plane is defined in [RFC8964].¶

## 2. Terminology

### 2.1. Terms Used in This Document

This document uses the terminology and concepts established in the DetNet architecture [RFC8655] [RFC8938] [RFC8964]. TSN-specific terms are defined in the TSN TG of the IEEE 802.1 Working Group. The reader is assumed to be familiar with these documents and their terminology.¶

### 2.2. Abbreviations

The following abbreviations are used in this document:¶

AC
  Attachment Circuit¶
CE
  Customer Edge equipment¶
d-CW
  DetNet Control Word¶
DetNet
  Deterministic Networking¶
DF
  DetNet Flow¶
FRER
  Frame Replication and Elimination for Redundancy (TSN function)¶
L2
  Layer 2¶
L2VPN
  Layer 2 Virtual Private Network¶
L3
  Layer 3¶
LSP
  Label Switched Path¶
LSR
  Label Switching Router¶
MPLS
  Multiprotocol Label Switching¶
MPLS-TE
  Multiprotocol Label Switching - Traffic Engineering¶
NSP
  Native Service Processing¶
OAM
  Operations, Administration, and Maintenance¶
PE
  Provider Edge¶
PREOF
  Packet Replication, Elimination and Ordering Functions¶
PW
  Pseudowire¶
S-PE
  Switching Provider Edge¶
T-PE
  Terminating Provider Edge¶
TSN
  Time-Sensitive Network¶

### 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. IEEE 802.1 TSN over DetNet MPLS Data Plane Scenario

Figure 1 shows IEEE 802.1 TSN end stations operating over a TSN-aware DetNet service running over an MPLS network. DetNet edge nodes sit at the boundary of a DetNet domain. They are responsible for mapping non-DetNet-aware L2 traffic to DetNet services. They also support the imposition and disposition of the required DetNet encapsulation. These are functionally similar to PW T-PE nodes, which use MPLS-TE LSPs. In this example, TSN Streams are simple applications over DetNet flows. The specifics of this operation are discussed later in this document.¶

       TSN           Edge          Transit         Edge          TSN
    End System       Node           Node           Node       End System
                    (T-PE)         (LSR)          (T-PE)

    +----------+                                             +----------+
    |   TSN    | <-------- End-to-End TSN Service ---------> |   TSN    |
    |  Applic. |                                             |  Applic. |
    +----------+  +.........+                   +.........+  +----------+
    |          |  | \S-Proxy:                   :S-Proxy/ |  |          |
    |   TSN    |  |   +.+---+<-- DetNet flow -->+---+ |   |  |   TSN    |
    |          |  |TSN| |Svc|                   |Svc| |TSN|  |          |
    +----------+  +---+ +---+    +----------+   +---+ +---+  +----------+
    |   L2     |  | L2| |Fwd|    |Forwarding|   |Fwd| |L2 |  |   L2     |
    +------.---+  +-.-+ +-.-+    +---.----.-+   +--.+ +-.-+  +---.------+
           :  Link  :     /  ,-----.  \   :  Link  :   /  ,-----. \
           +........+     +-[  Sub- ]-+   +........+   +-[  TSN  ]-+
                            [Network]                    [Network]
                             `-----'                      `-----'

                        |<------ DetNet MPLS ------>|
            |<---------------------- TSN   --------------------->|

Figure 1: A TSN over DetNet MPLS-Enabled Network

In this example, edge nodes provide a service proxy function that "associates" the DetNet flows and native flows (i.e., TSN Streams) at the edge of the DetNet domain. TSN Streams are treated as App-flows for DetNet. The whole DetNet domain behaves as a TSN relay node for the TSN Streams. The service proxy behaves as a port of that TSN relay node.¶

Figure 2 illustrates how DetNet can provide services for IEEE 802.1 TSN end systems, CE1 and CE2, over a DetNet-enabled MPLS network. Edge nodes E1 and E2 insert and remove the required DetNet data plane encapsulation. The 'X' in the edge nodes and relay node, R1, represent a potential DetNet compound flow packet replication and elimination point. This conceptually parallels L2VPN services and could leverage existing related solutions as discussed below.¶

         TSN    |<------- End-to-End DetNet Service ------>|  TSN
        Service |         Transit          Transit         | Service
    TSN  (AC)   |        |<-Tnl->|        |<-Tnl->|        |  (AC)  TSN
    End    |    V        V    1  V        V   2   V        V   |    End
    System |    +--------+       +--------+       +--------+   |  System
    +---+  |    |   E1   |=======|   R1   |=======|   E2   |   |   +---+
    |   |--|----|._X_....|..DF1..|.._ _...|..DF3..|...._X_.|---|---|   |
    |CE1|  |    |    \   |       |   X    |       |   /    |   |   |CE2|
    |   |       |     \_.|..DF2..|._/ \_..|..DF4..|._/     |       |   |
    +---+       |        |=======|        |=======|        |       +---+
        ^       +--------+       +--------+       +--------+       ^
        |        Edge Node       Relay Node        Edge Node       |
        |          (T-PE)           (S-PE)          (T-PE)         |
        |                                                          |
        |<- TSN -> <------- TSN over DetNet MPLS -------> <- TSN ->|
        |                                                          |
        |<-------- Time-Sensitive Networking (TSN) Service ------->|

        X   = Service protection
        DFx = DetNet member flow x over a TE LSP
            AC  = Attachment Circuit
            Tnl = Tunnel

Figure 2: IEEE 802.1TSN over DetNet

## 4. DetNet MPLS Data Plane

### 4.1. Overview

The basic approach defined in [RFC8964] supports the DetNet service sub-layer based on existing PW encapsulations and mechanisms and supports the DetNet forwarding sub-layer based on existing MPLS Traffic Engineering encapsulations and mechanisms.¶

A node operating on a DetNet flow in the DetNet service sub-layer, i.e., a node processing a DetNet packet that has the S-Label as top of stack, uses the local context associated with that S-Label. For example, a received F-Label can be used to determine what local DetNet operation(s) is applied to that packet. An S-Label may be unique when taken from the platform label space [RFC3031], which would enable correct DetNet flow identification regardless of which input interface or LSP the packet arrives on. The service sub-layer functions (i.e., PREOF) use a DetNet control word (d-CW).¶

The DetNet MPLS data plane builds on MPLS Traffic Engineering encapsulations and mechanisms to provide a forwarding sub-layer that is responsible for providing resource allocation and explicit routes. The forwarding sub-layer is supported by one or more forwarding labels (F-Labels).¶

DetNet edge/relay nodes are DetNet service sub-layer aware, understand the particular needs of DetNet flows, and provide both DetNet service and forwarding sub-layer functions. They add, remove, and process d-CWs, S-Labels, and F-Labels as needed. MPLS DetNet nodes and transit nodes include DetNet forwarding sub-layer functions -- notably, support for explicit routes and resource allocation to eliminate (or reduce) congestion loss and jitter. Unlike other DetNet node types, transit nodes provide no service sub-layer processing.¶

### 4.2. TSN over DetNet MPLS Encapsulation

The basic encapsulation approach is to treat a TSN Stream as an App-flow from the DetNet MPLS perspective. The corresponding example is shown in Figure 3. Note that three example flows are shown in the figure.¶

               /->     +------+  +------+  +------+   TSN      ^ ^
      MPLS     |       |  X   |  |  X   |  |  X   |<- Appli    : :
    App-Flow <-+       +------+  +------+  +------+   cation   : :(1)
               |       |TSN-L2|  |TSN-L2|  |TSN-L2|            : v
               \-> +---+======+--+======+--+======+-----+      :
                       | d-CW |  | d-CW |  | d-CW |            :
    DetNet-MPLS        +------+  +------+  +------+            :(2)
                       |Labels|  |Labels|  |Labels|            v
                   +---+======+--+======+--+======+-----+
    Link/Sub-Network   |  L2  |  | TSN  |  | UDP  |
                       +------+  +------+  +------+
                                           |  IP  |
                                           +------+
                                           |  L2  |
                                           +------+
        (1) TSN Stream
        (2) DetNet MPLS Flow

Figure 3: Examples of TSN over MPLS Encapsulation Formats

In the figure, "Application" indicates the application payload carried by the TSN network. "MPLS App-Flow" indicates that the TSN Stream is the payload from the perspective of the DetNet MPLS data plane defined in [RFC8964]. A single DetNet MPLS flow can aggregate multiple TSN Streams.¶

Note: Network fragmentation for DetNet is not supported and MUST be avoided. The reason for this is that network fragmentation is not consistent with the packet delivery times needed for DetNet. Therefore, when IP is used as the sub-network, IPv6 fragmentation MUST NOT be used, and IPv4 packets MUST be sent with the DF bit set. This means that the network operator MUST ensure that all the DetNet encapsulation overhead plus the maximum TSN App-flow frame size does not exceed the DetNet network's MTU.¶

## 5. TSN over MPLS Data Plane Procedures

The description of edge node procedures and functions for TSN over DetNet MPLS scenarios follows the concepts from [RFC3985] and covers the edge node components shown in Figure 1. In this section, the following procedures of DetNet edge nodes are described:¶

- TSN related (Section 5.1)¶
- DetNet Service Proxy (Section 5.2)¶
- DetNet service and forwarding sub-layer (Section 5.3)¶

The subsections describe procedures for forwarding packets by DetNet edge nodes, where such packets are received from either directly connected CEs (TSN nodes) or some other DetNet edge nodes.¶

### 5.1. Edge Node TSN Procedures

The TSN TG of the IEEE 802.1 Working Group has defined (and is defining) a number of amendments to [IEEE8021Q] that provide zero congestion loss and bounded latency in bridged networks. [IEEE8021CB] defines packet replication and elimination functions for a TSN network.¶

The implementation of a TSN entity (i.e., TSN packet processing functions) must be compliant with the relevant IEEE 802.1 standards.¶

TSN-specific functions are executed on the data received by the DetNet edge node from the connected CE before being forwarded to connected CE(s) or presented to the DetNet service proxy function for transmission across the DetNet domain. TSN-specific functions are also executed on the data received from a DetNet PW by a PE before the data is output on the AC(s).¶

The TSN packet processing function(s) of edge nodes (T-PE) belongs to the NSP [RFC3985] block. This is similar to other functionalities being defined by standards bodies other than the IETF (for example, in the case of Ethernet, stripping, overwriting, or adding VLAN tags, etc.). Depending on the TSN role of the edge node in the end-to-end TSN service, selected TSN functions are supported.¶

When a PE receives a packet from a CE on a given AC with DetNet service, it first checks via Stream identification (see Clause 6 of [IEEE8021CB] and [IEEEP8021CBdb]) whether the packet belongs to a configured TSN Stream (i.e., App-flow from the DetNet perspective). If no Stream ID is matched and no other (VPN) service is configured for the AC, then the packet MUST be dropped. If there is a matching TSN Stream, then the Stream-ID-specific TSN functions are executed (e.g., ingress policing, header field manipulation in the case of active Stream identification, FRER, etc.). Source Media Access Control (MAC) lookup may also be used for local MAC address learning.¶

If the PE decides to forward the packet, the packet MUST be forwarded according to the TSN-Stream-specific configuration to connected CE(s) (in case of local bridging) and/or to the DetNet service proxy (in case of forwarding to remote CE(s)). If there are no TSN-Stream-specific forwarding configurations, the PE MUST flood the packet to other locally attached CE(s) and to the DetNet service proxy. If the administrative policy on the PE does not allow flooding, the PE MUST drop the packet.¶

When a TSN entity of the PE receives a packet from the DetNet service proxy, it first checks via Stream identification (see Clause 6 of [IEEE8021CB] and [IEEEP8021CBdb]) whether the packet belongs to a configured TSN Stream. If no Stream ID is matched, then the packet is dropped. If there is a matching TSN Stream, then the Stream-ID-specific TSN functions are executed (e.g., header field manipulation in case of active Stream identification, FRER, etc.). Source MAC lookup may also be used for local MAC address learning.¶

If the PE decides to forward the packet, the packet is forwarded according to the TSN-Stream-specific configuration to connected CE(s). If there are no TSN-Stream-specific forwarding configurations, the PE floods the packet to locally attached CE(s). If the administrative policy on the PE does not allow flooding, the PE drops the packet.¶

Implementations of this document SHALL use management and control information to ensure TSN-specific functions of the edge node according to the expectations of the connected TSN network.¶

### 5.2. Edge Node DetNet Service Proxy Procedures

The service proxy function maps between App-flows and DetNet flows. The DetNet edge node TSN entity MUST support the TSN Stream identification functions (as defined in Clause 6 of [IEEE8021CB] and [IEEEP8021CBdb]) and the related managed objects (as defined in Clause 9 of [IEEE8021CB] and [IEEEP8021CBdb]) to recognize the packets related to App-flow. The service proxy presents TSN Streams as an App-flow to a DetNet flow.¶

When a DetNet service proxy receives a packet from the TSN entity, it MUST check whether such an App-flow is present in its mapping table. If present, it associates the internal DetNet flow ID to the packet and MUST forward it to the DetNet service and forwarding sub-layers. If no match is found, it MUST drop the packet.¶

When a DetNet service proxy receives a packet from the DetNet service and forwarding sub-layers, it MUST be forwarded to the edge node TSN entity.¶

Implementations of this document SHALL use management and control information to map a TSN Stream to a DetNet flow. N:1 mapping (aggregating multiple TSN Streams in a single DetNet flow) SHALL be supported. The management or control function that provisions flow mapping SHALL ensure that adequate resources are allocated and configured to fulfill the service requirements of the mapped flows.¶

Due to the (intentional) similarities of the DetNet PREOF and TSN FRER functions, service protection function interworking is possible between the TSN and the DetNet domains. Such service protection interworking scenarios might require copying of sequence number fields from TSN (L2) to PW (MPLS) encapsulation. However, such interworking is out of scope in this document and is left for further study.¶

### 5.3. Edge Node DetNet Service and Forwarding Sub-Layer Procedures

In the design presented in [RFC8964], an MPLS service label (the S-Label), similar to a PW label [RFC3985], is used to identify both the DetNet flow identity and the MPLS payload type. The DetNet sequence number is carried in the d-CW, which carries the Data/OAM discriminator as well. In [RFC8964], two sequence number sizes are supported: a 16-bit sequence number and a 28-bit sequence number.¶

PREOF functions and the provided service recovery are available only within the DetNet domain as the DetNet flow ID and the DetNet sequence number are not valid outside the DetNet network. MPLS (DetNet) edge nodes terminate all related information elements encoded in the MPLS labels.¶

When a PE receives a packet from the service proxy function, it MUST handle the packet as defined in [RFC8964].¶

When a PE receives an MPLS packet from a remote PE, then, after processing the MPLS label stack, if the top MPLS label ends up being a DetNet S-Label that was advertised by this node, then the PE MUST forward the packet according to the configured DetNet service and forwarding sub-layer rules to other PE nodes or via the DetNet service proxy function towards locally connected CE(s).¶

For further details on DetNet service and forwarding sub-layers, see [RFC8964].¶

## 6. Controller Plane (Management and Control) Considerations

Information related to TSN Stream(s) to DetNet flow mapping is required only for the service proxy function of MPLS (DetNet) edge nodes. From the data plane perspective, there is no practical difference based on the origin of flow-mapping-related information (management plane or control plane).¶

The following summarizes the set of information that is needed to configure TSN over DetNet MPLS:¶

- TSN-related configuration information according to the TSN role of the DetNet MPLS node, as per [IEEE8021Q], [IEEE8021CB], and [IEEEP8021CBdb].¶
- DetNet MPLS-related configuration information according to the DetNet role of the DetNet MPLS node, as per [RFC8964].¶
- App-flow identification information to map received TSN Stream(s) to the DetNet flow. Parameters of TSN Stream identification are defined in [IEEE8021CB] and [IEEEP8021CBdb].¶

This information MUST be provisioned per DetNet flow.¶

Mappings between DetNet and TSN management and control planes are out of scope of the document. Some of the challenges are highlighted below.¶

MPLS DetNet edge nodes are a member of both the DetNet domain and the connected TSN network. From the TSN network perspective, the MPLS (DetNet) edge node has a "TSN relay node" role, so TSN-specific management and control plane functionalities must be implemented. There are many similarities in the management plane techniques used in DetNet and TSN, but that is not the case for the control plane protocols. For example, RSVP-TE and MSRP behave differently. Therefore, management and control plane design is an important aspect of scenarios where mapping between DetNet and TSN is required.¶

Note that as the DetNet network is just a portion of the end-to-end TSN path (i.e., single hop from the Ethernet perspective), some parameters (e.g., delay) may differ significantly. Since there is no interworking function, the bandwidth of the DetNet network is assumed to be set large enough to handle all TSN flows it will support. At the egress of the DetNet domain, the MPLS headers are stripped, and the TSN flow continues on as a normal TSN flow.¶

In order to use a DetNet network to interconnect TSN segments, TSN-specific information must be converted to DetNet-domain-specific information. TSN Stream ID(s) and stream-related parameters/requirements must be converted to a DetNet flow ID and flow-related parameters/requirements.¶

In some cases, it may be challenging to determine some information related to the egress-node. For example, it may be not trivial to locate the egress point/interface of a TSN Stream with a multicast destination MAC address. Such scenarios may require interaction between control and management plane functions and between DetNet and TSN domains.¶

Mapping between DetNet flow identifiers and TSN Stream identifiers, if not provided explicitly, can be done by the service proxy function of an MPLS (DetNet) edge node locally based on information provided for the configuration of the TSN Stream identification functions (e.g., Mask-and-Match Stream identification).¶

Triggering the setup/modification of a DetNet flow in the DetNet network is an example where management and/or control plane interactions are required between the DetNet and the TSN network.¶

Configuration of TSN-specific functions (e.g., FRER) inside the TSN network is a TSN-domain-specific decision and may not be visible in the DetNet domain. Service protection interworking scenarios are left for further study.¶

## 7. Security Considerations

Security considerations for DetNet are described in detail in [DETNET-SEC]. General security considerations are described in [RFC8655].¶

Considerations specific to the DetNet MPLS data plane are summarized and described in [RFC8964], including any application flow types. This document focuses on a scenario where TSN Streams are the application flows for DetNet, which is already covered by those DetNet MPLS data plane security considerations.¶

## 8. IANA Considerations

This document has no IANA actions.¶

## 9. References

### 9.1. Normative References

[IEEE8021CB]
  IEEE, "Standard for Local and metropolitan area networks -- Frame Replication and Elimination for Reliability", IEEE 802.1CB-2017, DOI 10.1109/IEEESTD.2017.8091139, October 2017, <https://ieeexplore.ieee.org/document/8091139>.
[IEEEP8021CBdb]
  IEEE, "Draft Standard for Local and metropolitan area networks - Frame Replication and Elimination for Reliability - Amendment: Extended Stream Identification Functions", IEEE P802.1CBdb D1.3, April 2021, <https://1.ieee802.org/tsn/802-1cbdb>.
[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>.
[RFC3031]
  Rosen, E., Viswanathan, A., and R. Callon, "Multiprotocol Label Switching Architecture", RFC 3031, DOI 10.17487/RFC3031, January 2001, <https://www.rfc-editor.org/info/rfc3031>.
[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>.
[RFC8655]
  Finn, N., Thubert, P., Varga, B., and J. Farkas, "Deterministic Networking Architecture", RFC 8655, DOI 10.17487/RFC8655, October 2019, <https://www.rfc-editor.org/info/rfc8655>.
[RFC8938]
  Varga, B., Ed., Farkas, J., Berger, L., Malis, A., and S. Bryant, "Deterministic Networking (DetNet) Data Plane Framework", RFC 8938, DOI 10.17487/RFC8938, November 2020, <https://www.rfc-editor.org/info/rfc8938>.
[RFC8964]
  Varga, B., Ed., Farkas, J., Berger, L., Malis, A., Bryant, S., and J. Korhonen, "Deterministic Networking (DetNet) Data Plane: MPLS", RFC 8964, DOI 10.17487/RFC8964, January 2021, <https://www.rfc-editor.org/info/rfc8964>.

### 9.2. Informative References

[DETNET-SEC]
  Grossman, E., Ed., Mizrahi, T., and A. Hacker, "Deterministic Networking (DetNet) Security Considerations", Work in Progress, Internet-Draft, draft-ietf-detnet-security-16, 2 March 2021, <https://tools.ietf.org/html/draft-ietf-detnet-security-16>.
[IEEE8021Q]
  IEEE, "Standard for Local and Metropolitan Area Networks--Bridges and Bridged Networks", IEEE Std. 802.1Q-2018, DOI 10.1109/IEEESTD.2018.8403927, July 2018, <https://ieeexplore.ieee.org/document/8403927>.
[RFC3985]
  Bryant, S., Ed. and P. Pate, Ed., "Pseudo Wire Emulation Edge-to-Edge (PWE3) Architecture", RFC 3985, DOI 10.17487/RFC3985, March 2005, <https://www.rfc-editor.org/info/rfc3985>.

## Acknowledgements

The authors wish to thank Norman Finn, Lou Berger, Craig Gunther, Christophe Mangin, and Jouni Korhonen for their various contributions to this work.¶

## Authors' Addresses