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Checking references for intended status: Proposed Standard ---------------------------------------------------------------------------- (See RFCs 3967 and 4897 for information about using normative references to lower-maturity documents in RFCs) == Outdated reference: A later version (-07) exists of draft-ietf-detnet-ip-01 == Outdated reference: A later version (-13) exists of draft-ietf-detnet-mpls-01 == Outdated reference: A later version (-16) exists of draft-ietf-detnet-security-05 Summary: 0 errors (**), 0 flaws (~~), 4 warnings (==), 1 comment (--). Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 2 DetNet B. Varga, Ed. 3 Internet-Draft J. Farkas 4 Intended status: Standards Track Ericsson 5 Expires: April 29, 2020 L. Berger 6 LabN Consulting, L.L.C. 7 A. Malis 8 Independent 9 S. Bryant 10 Futurewei Technologies 11 J. Korhonen 12 October 27, 2019 14 DetNet Data Plane: MPLS over UDP/IP 15 draft-ietf-detnet-mpls-over-udp-ip-03 17 Abstract 19 This document specifies the MPLS Deterministic Networking data plane 20 operation and encapsulation over an IP network. The approach is 21 modeled on the operation of MPLS and over UDP/IP packet switched 22 networks. 24 Status of This Memo 26 This Internet-Draft is submitted in full conformance with the 27 provisions of BCP 78 and BCP 79. 29 Internet-Drafts are working documents of the Internet Engineering 30 Task Force (IETF). Note that other groups may also distribute 31 working documents as Internet-Drafts. The list of current Internet- 32 Drafts is at https://datatracker.ietf.org/drafts/current/. 34 Internet-Drafts are draft documents valid for a maximum of six months 35 and may be updated, replaced, or obsoleted by other documents at any 36 time. It is inappropriate to use Internet-Drafts as reference 37 material or to cite them other than as "work in progress." 39 This Internet-Draft will expire on April 29, 2020. 41 Copyright Notice 43 Copyright (c) 2019 IETF Trust and the persons identified as the 44 document authors. All rights reserved. 46 This document is subject to BCP 78 and the IETF Trust's Legal 47 Provisions Relating to IETF Documents 48 (https://trustee.ietf.org/license-info) in effect on the date of 49 publication of this document. Please review these documents 50 carefully, as they describe your rights and restrictions with respect 51 to this document. Code Components extracted from this document must 52 include Simplified BSD License text as described in Section 4.e of 53 the Trust Legal Provisions and are provided without warranty as 54 described in the Simplified BSD License. 56 Table of Contents 58 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 59 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 60 2.1. Terms Used in This Document . . . . . . . . . . . . . . . 3 61 2.2. Abbreviations . . . . . . . . . . . . . . . . . . . . . . 3 62 2.3. Requirements Language . . . . . . . . . . . . . . . . . . 4 63 3. DetNet MPLS Operation over DetNet 64 IP PSNs . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 65 4. DetNet Data Plane Procedures . . . . . . . . . . . . . . . . 5 66 5. Management and Control Information Summary . . . . . . . . . 6 67 6. Security Considerations . . . . . . . . . . . . . . . . . . . 6 68 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6 69 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6 70 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 7 71 9.1. Normative References . . . . . . . . . . . . . . . . . . 7 72 9.2. Informative References . . . . . . . . . . . . . . . . . 7 73 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8 75 1. Introduction 77 Deterministic Networking (DetNet) is a service that can be offered by 78 a network to DetNet flows. DetNet provides these flows extremely low 79 packet loss rates and assured maximum end-to-end delivery latency. 80 General background and concepts of DetNet can be found in [RFC8655]. 82 This document specifies use of the MPLS DetNet encapsulation over an 83 IP network. The approach is modeled on the operation of MPLS over an 84 IP Packet Switched Network (PSN) [RFC7510]. It maps the MPLS data 85 plane encapsulation described in [I-D.ietf-detnet-mpls] to the DetNet 86 IP data plane defined in [I-D.ietf-detnet-ip]. 88 To carry DetNet MPLS flows with full functionality at the DetNet 89 layer over an IP network, the following components are required 90 (these are a subset of the requirements for MPLS encapsulation listed 91 in [I-D.ietf-detnet-mpls]): 93 1. A method for identifying DetNet flows to the processing element. 95 2. A method for carrying the DetNet sequence number. 97 3. A method for distinguishing DetNet OAM packets from DetNet data 98 packets. 100 4. A method for carrying queuing and forwarding indication. 102 These requirements are satisfied by the DetNet over MPLS 103 Encapsulation described in [I-D.ietf-detnet-mpls] and they are partly 104 satisfied by the DetNet IP data plane defined in [I-D.ietf-detnet-ip] 106 2. Terminology 108 2.1. Terms Used in This Document 110 This document uses the terminology established in the DetNet 111 architecture [RFC8655], and the reader is assumed to be familiar with 112 that document and its terminology. 114 2.2. Abbreviations 116 The following abbreviations are used in this document: 118 d-CW A DetNet Control Word (d-CW) is used for sequencing and 119 identifying duplicate packets of a DetNet flow at the 120 DetNet service sub-layer. 122 DetNet Deterministic Networking. 124 A-Label A special case of an S-Label, whose properties are 125 known only at the aggregation and deaggregation end- 126 points. 128 F-Label A Detnet "forwarding" label that identifies the LSP 129 used to forward a DetNet flow across an MPLS PSN, e.g., 130 a hop-by-hop label used between label switching 131 routers. 133 MPLS Multiprotocol Label Switching. 135 OAM Operations, Administration, and Maintenance. 137 PEF Packet Elimination Function. 139 POF Packet Ordering Function. 141 PREOF Packet Replication, Elimination and Ordering Functions. 143 PRF Packet Replication Function. 145 PSN Packet Switched Network. 147 S-Label A DetNet "service" label that is used between DetNet 148 nodes that also implement the DetNet service sub-layer 149 functions. An S-Label is also used to identify a 150 DetNet flow at DetNet service sub-layer. 152 2.3. Requirements Language 154 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 155 "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and 156 "OPTIONAL" in this document are to be interpreted as described in BCP 157 14 [RFC2119] [RFC8174] when, and only when, they appear in all 158 capitals, as shown here. 160 3. DetNet MPLS Operation over DetNet IP PSNs 162 This document builds on the specification of MPLS over UDP defined in 163 [RFC7510]. It may replace partly or entirely the F-Label(s) used in 164 [I-D.ietf-detnet-mpls] with UDP and IP headers. The UDP and IP 165 header information is used to identify DetNet flows, including member 166 flows, per [I-D.ietf-detnet-ip]. The resulting encapsulation is 167 shown in Figure 1. There may be zero or more F-label(s) between the 168 S-label and the UDP header. 170 Note that this encapsulation works equally well with IPv4, IPv6, and 171 IPv6-based Segment Routing [I-D.ietf-6man-segment-routing-header]. 173 +---------------------------------+ 174 | | 175 | DetNet App-Flow | 176 | Payload Packet | 177 | | 178 +---------------------------------+ <--\ 179 | DetNet Control Word | | 180 +---------------------------------+ +--> DetNet data plane 181 | S-Label | | MPLS encapsulation 182 +---------------------------------+ | 183 | [ F-label(s) ] | | 184 +---------------------------------+ <--+ 185 | UDP Header | | 186 +---------------------------------+ +--> DetNet data plane 187 | IP Header | | IP encapsulation 188 +---------------------------------+ <--/ 189 | Data-Link | 190 +---------------------------------+ 191 | Physical | 192 +---------------------------------+ 194 Figure 1: UDP/IP Encapsulation of DetNet MPLS 196 S-Labels, d-CW and zero or more F-Labels are used as defined in 197 [I-D.ietf-detnet-mpls] and are not modified by this document. In 198 case of aggregates the A-Label is treated as an S-Label and it too is 199 not modified. 201 4. DetNet Data Plane Procedures 203 To support outgoing DetNet MPLS over UDP/IP encapsulation, an 204 implementation MUST support the provisioning of UDP and IP header 205 information in addition or in place of F-Label(s). Note, when PRF is 206 performed at the MPLS service sub-layer, there will be multiple 207 member flows, and each member flow will require the provisioning of 208 their own UDP and IP header information. The headers for each 209 outgoing packet MUST be formatted according to the configuration 210 information and as defined in [RFC7510], with one exception. Note 211 that the UDP Source Port value MUST be set to uniquely identify the 212 DetNet flow. The packet MUST then be handed as a DetNet IP packet, 213 per [I-D.ietf-detnet-ip]. This includes QoS related traffic 214 treatment. 216 To support receive processing an implementation MUST also support the 217 provisioning of received UDP and IP header information. The 218 provisioned information MUST be used to identify incoming app-flows 219 based on the combination of S-Label and incoming encapsulation header 220 information. Normal receive processing as defined in 221 [I-D.ietf-detnet-mpls], including PEF and POF, can then take place. 223 5. Management and Control Information Summary 225 The following summarizes the set of information that is needed to 226 configure DetNet MPLS over UDP/IP: 228 o Label information (S-label or F-label) to be mapped to UDP/IP 229 flow. Note that a single S-Label can map to multiple sets of UPD/ 230 IP information when PREOF is used. 232 o IPv4 or IPv6 source address field. 234 o IPv4 or IPv6 destination address field. 236 o IPv4 Type of Service or IPv6 Traffic Class Fields. 238 o UDP Source Port. 240 o UDP Destination Port. 242 This information MUST be provisioned per DetNet flow via 243 configuration, e.g., via the controller or management plane. 245 It is the responsibility of the DetNet controller plane to properly 246 provision both flow identification information and the flow specific 247 resources needed to provided the traffic treatment needed to meet 248 each flow's service requirements. This applies for aggregated and 249 individual flows. 251 6. Security Considerations 253 The security considerations of DetNet in general are discussed in 254 [RFC8655] and [I-D.ietf-detnet-security]. MPLS and IP specific 255 security considerations are described in [I-D.ietf-detnet-mpls] and 256 [I-D.ietf-detnet-ip]. This draft does not have additional security 257 considerations. 259 7. IANA Considerations 261 This document makes no IANA requests. 263 8. Acknowledgements 265 The authors wish to thank Pat Thaler, Norman Finn, Loa Anderson, 266 David Black, Rodney Cummings, Ethan Grossman, Tal Mizrahi, David 267 Mozes, Craig Gunther, George Swallow, Yuanlong Jiang and Carlos J. 268 Bernardos for their various contributions to this work. 270 9. References 272 9.1. Normative References 274 [I-D.ietf-detnet-ip] 275 Varga, B., Farkas, J., Berger, L., Fedyk, D., Malis, A., 276 Bryant, S., and J. Korhonen, "DetNet Data Plane: IP", 277 draft-ietf-detnet-ip-01 (work in progress), July 2019. 279 [I-D.ietf-detnet-mpls] 280 Varga, B., Farkas, J., Berger, L., Fedyk, D., Malis, A., 281 Bryant, S., and J. Korhonen, "DetNet Data Plane: MPLS", 282 draft-ietf-detnet-mpls-01 (work in progress), July 2019. 284 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate 285 Requirement Levels", BCP 14, RFC 2119, 286 DOI 10.17487/RFC2119, March 1997, 287 . 289 [RFC7510] Xu, X., Sheth, N., Yong, L., Callon, R., and D. Black, 290 "Encapsulating MPLS in UDP", RFC 7510, 291 DOI 10.17487/RFC7510, April 2015, 292 . 294 [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 295 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, 296 May 2017, . 298 9.2. Informative References 300 [I-D.ietf-6man-segment-routing-header] 301 Filsfils, C., Dukes, D., Previdi, S., Leddy, J., 302 Matsushima, S., and d. daniel.voyer@bell.ca, "IPv6 Segment 303 Routing Header (SRH)", draft-ietf-6man-segment-routing- 304 header-26 (work in progress), October 2019. 306 [I-D.ietf-detnet-security] 307 Mizrahi, T., Grossman, E., Hacker, A., Das, S., Dowdell, 308 J., Austad, H., Stanton, K., and N. Finn, "Deterministic 309 Networking (DetNet) Security Considerations", draft-ietf- 310 detnet-security-05 (work in progress), August 2019. 312 [RFC8655] Finn, N., Thubert, P., Varga, B., and J. Farkas, 313 "Deterministic Networking Architecture", RFC 8655, 314 DOI 10.17487/RFC8655, October 2019, 315 . 317 Authors' Addresses 319 Balazs Varga (editor) 320 Ericsson 321 Magyar Tudosok krt. 11. 322 Budapest 1117 323 Hungary 325 Email: balazs.a.varga@ericsson.com 327 Janos Farkas 328 Ericsson 329 Magyar Tudosok krt. 11. 330 Budapest 1117 331 Hungary 333 Email: janos.farkas@ericsson.com 335 Lou Berger 336 LabN Consulting, L.L.C. 338 Email: lberger@labn.net 340 Andrew G. Malis 341 Independent 343 Email: agmalis@gmail.com 345 Stewart Bryant 346 Futurewei Technologies 348 Email: stewart.bryant@gmail.com 350 Jouni Korhonen 352 Email: jouni.nospam@gmail.com