DetNet J. Farkas Internet-Draft B. Varga Intended status: Standards Track Ericsson Expires: September 13, 2017 R. Cummings National Instruments March 12, 2017 DetNet Flow Information Model Based on TSN draft-farkas-detnet-flow-information-model-00 Abstract This document describes flow information model for Deterministic Networking (DetNet). The DetNet service is provided either for a Layer 3 or a Layer 2 flow. This document provides DetNet flow information model both for Layer 3 and Layer 2 flows in an integrated fashion. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on September 13, 2017. Copyright Notice Copyright (c) 2017 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of Farkas, et al. Expires September 13, 2017 [Page 1] Internet-Draft DetNet Flow Information Model March 2017 the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Goals . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2. Non Goals . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Conventions Used in This Document . . . . . . . . . . . . . . 4 3. Terminology and Definitions . . . . . . . . . . . . . . . . . 4 4. Naming Conventions . . . . . . . . . . . . . . . . . . . . . 4 5. End System . . . . . . . . . . . . . . . . . . . . . . . . . 5 6. Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6.1. Identification and Specification of Flows . . . . . . . . 6 6.1.1. DetNet L3 Flow Identification and Specification . . . 7 6.1.2. DetNet L2 Flow Identification and Specification . . . 7 6.2. Traffic Specification . . . . . . . . . . . . . . . . . . 8 6.3. Flow Rank . . . . . . . . . . . . . . . . . . . . . . . . 8 7. Source . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8. Destination . . . . . . . . . . . . . . . . . . . . . . . . . 9 9. Common Attributes of Source and Destination . . . . . . . . . 10 9.1. End System Interfaces . . . . . . . . . . . . . . . . . . 10 9.2. Interface Capabilities . . . . . . . . . . . . . . . . . 10 9.3. User to Network Requirements . . . . . . . . . . . . . . 11 10. Status . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 10.1. Status Info . . . . . . . . . . . . . . . . . . . . . . 13 10.2. Interface Configuration . . . . . . . . . . . . . . . . 14 10.3. Failed Interfaces . . . . . . . . . . . . . . . . . . . 14 11. Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14 13. Security Considerations . . . . . . . . . . . . . . . . . . . 15 14. References . . . . . . . . . . . . . . . . . . . . . . . . . 15 14.1. Normative References . . . . . . . . . . . . . . . . . . 15 14.2. Informative References . . . . . . . . . . . . . . . . . 15 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16 1. Introduction A Deterministic Networking (DetNet) service provides a capability to carry a unicast or a multicast data flow for an application with constrained requirements on network performance, e.g., low packet loss rate and/or latency. The DetNet service is provided either for a Layer 3 (L3) flow or a Layer 2 (L2) flow by an IP/MPLS network, see, e.g., [I-D.ietf-detnet-dp-alt]. Similarly, Time-Sensitive Networking (TSN) [IEEE8021TSN]) can be used for L2 flows in a bridged network. DetNet and TSN have common architecture as expressed in [IETFDetNet] and [I-D.ietf-detnet-architecture]. DetNet service can be leveraged both by L3 and L2 flows, i.e., by DetNet L3 flows and Farkas, et al. Expires September 13, 2017 [Page 2] Internet-Draft DetNet Flow Information Model March 2017 DetNet L2 flows. Therefore, the DetNet flow information model provided by this document covers both DetNet L3 flows and DetNet L2 flows in an integrated fashion. Thus, the DetNet flow information model is based on [I-D.ietf-detnet-architecture] and on the data model specified by [IEEE8021Qcc]. Furthermore, the DetNet flow information model relies on the flow identification possibilities described in [IEEE8021CB], which is used by [IEEE8021Qcc] as well. In addition to TSN data model, [IEEE8021Qcc] also specifies configuration of TSN features (e.g., traffic scheduling specified by [IEEE8021Qbv]). Due to the common architecture and flow model, configuration features can be leveraged in certain deployment scenarios, e.g., when the network that provides the DetNet service includes both L3 and L2 network segments. Based on the DetNet architecture [I-D.ietf-detnet-architecture] (see Section 4), this document (this revision) only considers the Centralized Network / Distributed User Model out of the models specified by [IEEE8021Qcc]. That is, there is a User-Network Interface (UNI) between an end system and a network. Furthermore, there is a central entity for the control of the network. For instance, the central entity implements a Path Computation Element (PCE) for the calculation and establishment of paths needed for packet replication and elimination, if any. [[NOTE (to be removed from a future revision): The Goals and Non goals subsections are only for revision 00, they are to be removed from future revisions of this draft.]] 1.1. Goals As it is expressed in the Charter [IETFDetNet], the DetNet WG collaborates with IEEE 802.1 TSN in order to define a common architecture for both Layer 2 and Layer 3, which is beneficial for various reasons, e.g., in order to simplify implementations. The flow information model should be also common along those lines. As the TSN flow information/data model specified by [IEEE8021Qcc] is mature, the DetNet flow information model described in this document is based on [IEEE8021Qcc], which is an amendment to [IEEE8021Q]. The Centralized Network / Distributed User Model of [IEEE8021Qcc] is used in this revision as a start of the work. Further models can be also useful for DetNet, e.g., the Fully Centralized Model for the Industrial M2M use case [I-D.ietf-detnet-use-cases]. This document intends to specify flow information model only. Farkas, et al. Expires September 13, 2017 [Page 3] Internet-Draft DetNet Flow Information Model March 2017 Revision 00 is just a start; it is not complete. As this revision heavily relies on [IEEE8021Qcc], the need for further DetNet specific aspects is to be reviewed and missing pieces are to be added. 1.2. Non Goals This document (this revision) does not intend to specify either flow data model or DetNet configuration. From these aspects, the goals of this document differ from the goals of [IEEE8021Qcc], which also specifies data model and configuration of certain TSN features. 2. Conventions Used in This Document The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. The lowercase forms with an initial capital "Must", "Must Not", "Shall", "Shall Not", "Should", "Should Not", "May", and "Optional" in this document are to be interpreted in the sense defined in [RFC2119], but are used where the normative behavior is defined in documents published by SDOs other than the IETF. 3. Terminology and Definitions This document uses the terminology established in Section 2 of the DetNet architecture document [I-D.ietf-detnet-architecture]. The DetNet <=> TSN dictionary of [I-D.ietf-detnet-architecture] is used to perform translation from [IEEE8021Qcc] to this document. Additional terms used in this document: DetNet L3 Flow: Layer 3 (L3) flow leveraging DetNet service. DetNet L2 Flow: Layer 2 (L2) flow leveraging DetNet service. 4. Naming Conventions The following naming conventions were used for naming information model components in this document. It is recommended that extensions of the model use the same conventions. o Names SHOULD be descriptive. o Names MUST start with uppercase letters. o Composed names MUST use capital letters for the first letter of each component. All other letters are lowercase, even for acronyms. Exceptions are made for acronyms containing a mixture Farkas, et al. Expires September 13, 2017 [Page 4] Internet-Draft DetNet Flow Information Model March 2017 of lowercase and capital letters, such as IPv6. Examples are SourceMacAddress and DestinationIPv6Address. 5. End System Deterministic service is required by time/loss sensitive application(s) running on an end system during communication with its peer(s). Such a data exchange has various requirements on delay and/ or loss parameters. The DetNet architecture [I-D.ietf-detnet-architecture] distinguishes two kinds of end systems: Source and Destination. The same distinction is applied for the DetNet flow information model. In addition to the end systems interested in a flow, the status information of the flow is also important. Therefore, the DetNet flow information model relies on three high level groups: o Source: an end system capable of sourcing a DetNet flow. The Source information group includes elements that specify the Source for a single flow. This information group is applied from the user to the network. o Destination: an end system that is a destination of a DetNet flow. The Destination information group includes elements that specify the Destination for a single flow. This information group is applied from the user to the network. o Status: the status of a DetNet flow. The status information group includes elements that specify the status of the flow in the network. This information group is applied from the network to the user. This information group informs the user whether or not the flow is ready for use. There are two operations for each flow with respect to a Source or a Destination: o Join: Source/Destination request to join the flow. o Leave: Source/Destination request to leave the flow. [[NOTE (to be removed from a future revision): Adding Modify operation can be considered to address cases when a flow is slightly changed, e.g., only MaxPacketSize (Section 6.2) has been changed.]] As the DetNet UNI can provide both L3 and L2 services, end systems may not need to implement the L3 <=> L2 Transfer Function specified by [IEEE8021CB] (see, e.g., subclause 6.3; see also subclause 46.1 in [IEEE8021Qcc]). An edge node may implement a function similar to the Farkas, et al. Expires September 13, 2017 [Page 5] Internet-Draft DetNet Flow Information Model March 2017 Transfer Function, see, e.g., the Svc Proxy in Figure 1 in [I-D.ietf-detnet-dp-alt]. 6. Flow The flows leveraging DetNet service can be unicast or multicast data flows for an application with constrained requirements on network performance, e.g., low packet loss rate and/or latency. Therefore, they can require different connectivity types: point-to-point (p2p) or point-to-multipoint (p2mp). The p2mp connectivity is created by a transport layer function (e.g., p2mp LSP) [I-D.ietf-detnet-dp-alt]. (Note that mp2mp connectivity is a superposition of p2mp connections.) Many flows using DetNet service are periodic with fix packet size (i.e., Constant Bit Rate (CBR) flows), or periodic with variable packet size. Delay and loss parameters are correlated because the effect of late delivery can result data loss for an application. However, not all applications require hard limits on both parameters (delay and loss). For example, some real-time applications allow graceful degradation if loss happens (e.g., sample-based processing, media distribution). Some others may require high-bandwidth connections that make the usage of techniques like packet replication economically challenging or even impossible. Some applications may not tolerate loss, but are not delay sensitive (e.g., bufferless sensors). Time/loss sensitive applications may have somewhat special requirements especially for loss (e.g., no loss in two consecutive communication cycles; very low outage time, etc.). Flows have the following attributes: a. DataFlowSpecification (Section 6.1) b. TrafficSpecification (Section 6.2) c. FlowRank (Section 6.3) Flow attributes are described in the following sections. 6.1. Identification and Specification of Flows Identification options for TSN flows are specified by [IEEE8021CB], which also includes IP flow identification, see, e.g., Table 6-1 in Clause 6. Therefore, the flow identification specified by [IEEE8021CB] is also applicable to DetNet flows. Farkas, et al. Expires September 13, 2017 [Page 6] Internet-Draft DetNet Flow Information Model March 2017 [[NOTE (to be removed from a future revision): Extensions to the options specified by [IEEE8021CB] can be discussed.]] DataFlowSpecification specifies DetNet flows as follows; see Section 6.1.1 for DetNet L3 flows and Section 6.1.2 for DetNet L2 flows. 6.1.1. DetNet L3 Flow Identification and Specification DetNet L3 flows can be identified and specified by the following attributes: a. SourceIpAddress b. DestinationIpAddress c. Dscp d. Protocol e. SourcePort f. DestinationPort g. MplsLabel 6.1.2. DetNet L2 Flow Identification and Specification DetNet L2 flows can be identified and specified by the following attributes: a. DestinationMacAddress b. SourceMacAddress c. Pcp d. VlanId [[NOTE (to be removed from a future revision): The Multiple Stream Registration Protocol (MSRP) [IEEE8021Q] uses StreamID to match Talker registrations with their corresponding Listener registrations, i.e., to identify Streams (L2 TSN flows). The StreamID includes the following subcomponents: o A 48-bit MAC Address associated with the Talker sourcing the stream to the bridged network. Farkas, et al. Expires September 13, 2017 [Page 7] Internet-Draft DetNet Flow Information Model March 2017 o A 16-bit unsigned integer value, Unique ID, used to distinguish among multiple streams sourced by the same Talker. ]] 6.2. Traffic Specification TrafficSpecification specifies how the Source transmits packets for the flow. This is effectively the promise/request of the Source to the network. The network uses this traffic specification to allocate resources and adjust queue parameters in network nodes. TrafficSpecification has the following attributes: a. Interval: the period of time in which the traffic specification cannot be exceeded. b. MaxPacketsPerInterval: the maximum number of packets that the Source will transmit in one Interval. c. MaxPayloadSize: the maximum payload size that the Source will transmit. 6.3. Flow Rank FlowRank provides the rank of this flow relative to others flows in the network. This rank is used to determine success/failure of flow establishment. Rank (boolean) is used by the network to decide which flows can and cannot exist when network resources reach their limit. Rank is used to help to determine which flows can be dropped (i.e., removed from node configuration) if a port of a node becomes oversubscribed (e.g., due to network reconfiguration). The false value is more important than the true value (i.e., flows with true are dropped first). 7. Source The Source object specifies: o The behavior of the Source for the flow (how/when the Source transmits). o The requirements of the Source from the network. o The capabilities of the interface(s) of the Source. The Source object includes the following attributes: Farkas, et al. Expires September 13, 2017 [Page 8] Internet-Draft DetNet Flow Information Model March 2017 a. DataFlowSpecification (Section 6.1) b. TrafficSpecification (Section 6.2) c. FlowRank (Section 6.3) d. EndSystemInterfaces (Section 9.1) e. InterfaceCapabilities (Section 9.2) f. UserToNetworkRequirements (Section 9.3) For the join operation, the DataFlowSpecification, FlowRank, EndSystemInterfaces, and TrafficSpecification SHALL be included within the Source. For the join operation, the UserToNetworkRequirements and InterfaceCapabilities groups MAY be included within the Source. For the leave operation, the DataFlowSpecification and EndSystemInterfaces SHALL be included within the Source. 8. Destination The Destination object includes the following attributes: a. DataFlowSpecification (Section 6.1) b. EndSystemInterfaces (Section 9.1) c. InterfaceCapabilities (Section 9.2) d. UserToNetworkRequirements (Section 9.3) For the join operation, the DataFlowSpecification and EndSystemInterfaces SHALL be included within the Destination. For the join operation, the UserToNetworkRequirements and InterfaceCapabilities groups MAY be included within the Destination. For the leave operation, the DataFlowSpecification and EndSystemInterfaces SHALL be included within the Destination. [[NOTE (to be removed from a future revision): Should we add DestinationRank? It could distinguish the importance of Destinations if the flow cannot be provided for all Destinations.]] Farkas, et al. Expires September 13, 2017 [Page 9] Internet-Draft DetNet Flow Information Model March 2017 9. Common Attributes of Source and Destination Source and Destination end systems have the following common attributes in addition to DataFlowSpecification (Section 6.1). 9.1. End System Interfaces EndSystemInterfaces is a list of identifiers, one for each physical interface (port) in the end system acting as a Source or Destination. An interface is identified by an IP or a MAC address. [[NOTE (to be removed from a future revision): Sub-Interfaces to be added, e.g., based on IfIndex.]] 9.2. Interface Capabilities InterfaceCapabilities specifies the network capabilities of all interfaces (ports) contained in the EndSystemInterfaces object (Section 9.1). These capabilities may be configured via the InterfaceConfiguration object (Section 10.2) of the Status object (Section 10). Note that an end system may have multiple interfaces with different network capabilities. In this case, each interface should be specified in a distinct top-level Source or Destination object (i.e., one entry in EndSystemInterfaces (Section 9.1)). Use of multiple entries in EndSystemInterfaces is intended for network capabilities that span multiple interfaces (e.g., packet replication and elimination).";. [[NOTE (to be removed from a future revision): InterfaceCapabilities attributes are to be defined. For information, [IEEE8021Qcc] specifies the following attributes: a. VlanTagCapable (Customer VLAN Tag capable) b. CB-Capable (frame replication and elimination capable) c. CB-StreamIdenTypeList (a list of the optional Stream Identification types supported by the interface as specified in [IEEE8021CB].) d. CB-SequenceTypeList (a list of the optional Sequence Encode/ Decode types supported by the interface as specified in [IEEE8021CB].) ]] Farkas, et al. Expires September 13, 2017 [Page 10] Internet-Draft DetNet Flow Information Model March 2017 9.3. User to Network Requirements UserToNetworkRequirements specifies user requirements for the flow, such as latency and reliability. The UserToNetworkRequirements object includes the following attributes: a. NumReplicationTrees b. MaxLatency NumReplicationTrees specifies the number of maximally disjoint trees that the network should configure to provide packet replication and elimination for the flow. NumReplicationTrees is provided by the Source only. Destinations SHALL set this element to one. Value zero and one indicate no packet replication and elimination for the flow. When NumReplicationTrees is greater than one, packet replication and elimination is to be used for the flow. If the Source sets this element to greater than one, and packet replication and elimination is not possible in the network (e.g., no disjoint paths, or the nodes do not support packet replication and elimination), then the FailureCode of the Status object is non-zero (Section 10.1). MaxLatency is the maximum latency from Source to Destination(s) for a single packet of the flow. MaxLatency is specified as an integer number of nanoseconds. When this requirement is specified by the Source, it must be satisfied for all Destinations. When this requirement is specified by a Destination, it must be satisfied for that particular Destination only. If the UserToNetworkRequirements group is not provided within the Source or Destination object, then value zero SHALL be used for this element. Value zero represents a special use for the maximum latency requirement. Value zero locks- down the initial latency that the network provides in the AccumulatedLatency parameter of the Status object (Section 10) after the successful configuration of the flow, such that any subsequent increase in the latency beyond that initial value causes the flow to fail. [[NOTE-1 (to be removed from a future revision): Should we add a parameter to specify the maximum packet loss rate that can be tolerated for the flow?]] [[NOTE-2 (to be removed from a future revision): TrafficSpecification (Section 6.2) specifies the Peak Information Rate (PIR) of the flow, which is a kind of user requirement to the network. Should we add Committed Information Rate (CIR), i.e., the minimum rate the user requests to be guaranteed for the flow by the network?]] Farkas, et al. Expires September 13, 2017 [Page 11] Internet-Draft DetNet Flow Information Model March 2017 10. Status The Status object is provided by the network each Source and Destination of the flow. The Status object provides the status of the flow with respect to the establishment of the flow by the network. The Status object is delivered via the corresponding UNI to each Source and Destination end system of the flow. The Status is distinct for each Source or Destination because the AccumulatedLatency and InterfaceConfiguration objects are distinct, see below. The Status object SHALL include the attributes a), b), c); and MAY include attributes d), e): a. DataFlowSpecification (Section 6.1) b. StatusInfo (Section 10.1) c. AccumulatedLatency (this section below) d. InterfaceConfiguration (Section 10.2) e. FailedInterfaces (Section 10.3) DataFlowSpecification identifies the flow for which status is provided. DataFlowSpecification is described in (Section 6.1) If the Status object is provided without a Source or Destination object in a protocol message via a UNI, then the DataFlowSpecification object SHALL be included within the Status object for both join and leave operations. If the Status object immediately follows a Source or Destination object in the protocol message, then the DataFlowSpecification object is obtained from the Source/Destination object, and therefore DataFlowSpecification is not required within the Status object. AccumulatedLatency provides the worst-case latency that a single packet of the flow can encounter along its current path(s) in the network. When provided to a Source, AccumulatedLatency is the worst- case latency for all Destinations (worst path). AccumulatedLatency is specified as an integer number of nanoseconds. Latency is measured using the time at which the data frame's message timestamp point passes the reference plane marking the boundary between the network media and PHY. The message timestamp point is specified by IEEE Std 802.1AS [IEEE8021AS] for various media. For a successful Status, the network returns a value less than or equal to the MaxLatency of the UserToNetworkRequirements (Section 9.3). If the NumReplicationTrees of the UserToNetworkRequirements (Section 9.3) is one, then the AccumlatedLatency SHALL provide the worst latency for Farkas, et al. Expires September 13, 2017 [Page 12] Internet-Draft DetNet Flow Information Model March 2017 the current path from the Source to each Destination. If the path is changed (e.g., due to rerouting), then the AccumulatedLatency changes accordingly. If the NumReplicationTrees of the UserToNetworkRequirements (Section 9.3) is greater than one, AccumlatedLatency SHALL provide the worst latency for all paths in use from the Source to each Destination. 10.1. Status Info StatusInfo provides information regarding the status of a flow's configuration in the network. The StatusInfo object MAY include the following attributes: a. SourceStatus is an enumeration for the status of the flow's Source: * None: no Source * Ready: Source is ready * Failed: Source failed b. DestinationStatus is an enumeration for the status of the flow's Destinations: * None: no Destination * Ready: all Destinations are ready * PartialFailed: One or more Destinations ready, and one or more Listeners failed. The flow can be used tf the Source is Ready. * Failed: All Destinations failed. c. FailureCode: A non-zero code that specifies the problem if the flow encounters a failure (e.g., packet replication and elimination is requested but not possible, or SourceStatus is Failed, or DestinationStatus is Failed, or DestinationStatus is PartialFailed). [[NOTE (to be removed from a future revision): FailureCodes to be defined for DetNet. Table 46-1 of [IEEE8021Qcc] describes TSN failure codes.]] Farkas, et al. Expires September 13, 2017 [Page 13] Internet-Draft DetNet Flow Information Model March 2017 10.2. Interface Configuration InterfaceConfiguration provides configuration of interfaces in the Source/Destination. This configuration assists the network in meeting the requirements of the flow. The InterfaceConfiguration object is according to the capabilities of the interface. InterfaceConfiguration can be distinct for each Source or Destination of each flow. If the InterfaceConfiguration object is not provided within the Status object, then the network SHALL assume zero elements as the default (no interface configuration). The InterfaceConfiguration object MAY include one or more the following attributes: a. MAC or IP Address to identify the interface b. DataFlowSpecification (Section 6.1) 10.3. Failed Interfaces FailedInterfaces provides a list of one or more physical interfaces (ports) in the failed node when a failure occurs in network configuration (i.e., non-zero FailureCode in StatusInfo object (Section 10.1)). The InterfaceConfiguration object includes the following attributes: a. MAC or IP Address to identify the interface b. InterfaceName InterfaceName is the name of the interface (port) within the node. This interface name SHALL be persistent, and unique within the node. 11. Summary This document describes DetNet flow information model both for DetNet L3 flows and DetNet L2 flows based on the TSN data model specified by [IEEE8021Qcc]. This revision of the document is just to start the discussions; further work is needed. 12. IANA Considerations N/A. Farkas, et al. Expires September 13, 2017 [Page 14] Internet-Draft DetNet Flow Information Model March 2017 13. Security Considerations N/A. 14. References 14.1. Normative References [I-D.ietf-detnet-architecture] Finn, N. and P. Thubert, "Deterministic Networking Architecture", draft-ietf-detnet-architecture-00 (work in progress), September 2016. [I-D.ietf-detnet-dp-alt] Korhonen, J., Farkas, J., Mirsky, G., Thubert, P., Zhuangyan, Z., and L. Berger, "DetNet Data Plane Protocol and Solution Alternatives", draft-ietf-detnet-dp-alt-00 (work in progress), October 2016. [I-D.ietf-detnet-use-cases] Grossman, E., Gunther, C., Thubert, P., Wetterwald, P., Raymond, J., Korhonen, J., Kaneko, Y., Das, S., Zha, Y., Varga, B., Farkas, J., Goetz, F., and J. Schmitt, "Deterministic Networking Use Cases", draft-ietf-detnet- use-cases-01 (work in progress), February 2016. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . 14.2. Informative References [IEEE8021AS] IEEE 802.1, "IEEE 802.1AS-2011: IEEE Standard for Local and metropolitan area networks - Timing and Synchronization for Time-Sensitive Applications in Bridged Local Area Networks", 2011, . [IEEE8021CB] IEEE 802.1, "IEEE P802.1CB: IEEE Draft Standard for Local and metropolitan area networks - Frame Replication and Elimination for Reliability", 2017, . Farkas, et al. Expires September 13, 2017 [Page 15] Internet-Draft DetNet Flow Information Model March 2017 [IEEE8021Q] IEEE 802.1, "IEEE 802.1Q-2014: IEEE Standard for Local and metropolitan area networks - Bridges and Bridged Networks", 2014, . [IEEE8021Qbv] IEEE 802.1, "IEEE 802.1Qbv-2015: IEEE Standard for Local and metropolitan area networks - Bridges and Bridged Networks -- Amendment 25: Enhancements for Scheduled Traffic", 2015, . [IEEE8021Qcc] IEEE 802.1, "IEEE P802.1Qcc-2015: IEEE Draft Standard for Local and metropolitan area networks - Bridges and Bridged Networks -- Amendment: Stream Reservation Protocol (SRP) Enhancements and Performance Improvements", 2017, . [IEEE8021TSN] IEEE 802.1, "IEEE 802.1 Time-Sensitive Networking (TSN) Task Group", . [IETFDetNet] IETF, "IETF Deterministic Networking (DetNet) Working Group", . Authors' Addresses Janos Farkas Ericsson Konyves Kalman krt. 11/B Budapest 1097 Hungary Email: janos.farkas@ericsson.com Balazs Varga Ericsson Konyves Kalman krt. 11/B Budapest 1097 Hungary Email: balazs.a.varga@ericsson.com Farkas, et al. Expires September 13, 2017 [Page 16] Internet-Draft DetNet Flow Information Model March 2017 Rodney Cummings National Instruments 11500 N. Mopac Expwy Bldg. C Austin, TX 78759-3504 USA Email: rodney.cummings@ni.com Farkas, et al. Expires September 13, 2017 [Page 17]