< draft-ietf-detnet-mpls-06.txt   draft-ietf-detnet-mpls-07.txt >
DetNet B. Varga, Ed. DetNet B. Varga, Ed.
Internet-Draft J. Farkas Internet-Draft J. Farkas
Intended status: Standards Track Ericsson Intended status: Standards Track Ericsson
Expires: October 25, 2020 L. Berger Expires: December 10, 2020 L. Berger
LabN Consulting, L.L.C. LabN Consulting, L.L.C.
A. Malis A. Malis
Malis Consulting Malis Consulting
S. Bryant S. Bryant
Futurewei Technologies Futurewei Technologies
J. Korhonen J. Korhonen
April 23, 2020 June 8, 2020
DetNet Data Plane: MPLS DetNet Data Plane: MPLS
draft-ietf-detnet-mpls-06 draft-ietf-detnet-mpls-07
Abstract Abstract
This document specifies the Deterministic Networking data plane when This document specifies the Deterministic Networking data plane when
operating over an MPLS Packet Switched Networks. operating over an MPLS Packet Switched Networks.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
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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 October 25, 2020. This Internet-Draft will expire on December 10, 2020.
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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4.2. MPLS Data Plane Encapsulation . . . . . . . . . . . . . . 9 4.2. MPLS Data Plane Encapsulation . . . . . . . . . . . . . . 9
4.2.1. DetNet Control Word and the DetNet Sequence Number . 10 4.2.1. DetNet Control Word and the DetNet Sequence Number . 10
4.2.2. S-Labels . . . . . . . . . . . . . . . . . . . . . . 11 4.2.2. S-Labels . . . . . . . . . . . . . . . . . . . . . . 11
4.2.3. F-Labels . . . . . . . . . . . . . . . . . . . . . . 14 4.2.3. F-Labels . . . . . . . . . . . . . . . . . . . . . . 14
4.3. OAM Indication . . . . . . . . . . . . . . . . . . . . . 16 4.3. OAM Indication . . . . . . . . . . . . . . . . . . . . . 16
4.4. Flow Aggregation . . . . . . . . . . . . . . . . . . . . 17 4.4. Flow Aggregation . . . . . . . . . . . . . . . . . . . . 17
4.4.1. Aggregation Via LSP Hierarchy . . . . . . . . . . . . 17 4.4.1. Aggregation Via LSP Hierarchy . . . . . . . . . . . . 17
4.4.2. Aggregating DetNet Flows as a new DetNet flow . . . . 18 4.4.2. Aggregating DetNet Flows as a new DetNet flow . . . . 18
4.5. Service Sub-Layer Considerations . . . . . . . . . . . . 19 4.5. Service Sub-Layer Considerations . . . . . . . . . . . . 19
4.5.1. Edge Node Processing . . . . . . . . . . . . . . . . 19 4.5.1. Edge Node Processing . . . . . . . . . . . . . . . . 19
4.5.2. Relay Node Processing . . . . . . . . . . . . . . . . 20 4.5.2. Relay Node Processing . . . . . . . . . . . . . . . . 19
4.6. Forwarding Sub-Layer Considerations . . . . . . . . . . . 20 4.6. Forwarding Sub-Layer Considerations . . . . . . . . . . . 20
4.6.1. Class of Service . . . . . . . . . . . . . . . . . . 20 4.6.1. Class of Service . . . . . . . . . . . . . . . . . . 20
4.6.2. Quality of Service . . . . . . . . . . . . . . . . . 20 4.6.2. Quality of Service . . . . . . . . . . . . . . . . . 20
5. Management and Control Information Summary . . . . . . . . . 21 5. Management and Control Information Summary . . . . . . . . . 21
5.1. Service Sub-Layer Information Summary . . . . . . . . . . 22 5.1. Service Sub-Layer Information Summary . . . . . . . . . . 22
5.1.1. Service Aggregation Information Summary . . . . . . . 23 5.1.1. Service Aggregation Information Summary . . . . . . . 23
5.2. Forwarding Sub-Layer Information Summary . . . . . . . . 23 5.2. Forwarding Sub-Layer Information Summary . . . . . . . . 23
6. Security Considerations . . . . . . . . . . . . . . . . . . . 24 6. Security Considerations . . . . . . . . . . . . . . . . . . . 24
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 25 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 25
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 25 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 25
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Figure 1: DetNet Adaptation to MPLS Data Plane Figure 1: DetNet Adaptation to MPLS Data Plane
The DetNet MPLS data plane representation is illustrated in Figure 1. The DetNet MPLS data plane representation is illustrated in Figure 1.
The service sub-layer includes a DetNet control word (d-CW) and a The service sub-layer includes a DetNet control word (d-CW) and a
identifying service label (S-Label). The DetNet control word (d-CW) identifying service label (S-Label). The DetNet control word (d-CW)
conforms to the Generic PW MPLS Control Word (PWMCW) defined in conforms to the Generic PW MPLS Control Word (PWMCW) defined in
[RFC4385]. An aggregation label (A-Label) is a special case of [RFC4385]. An aggregation label (A-Label) is a special case of
S-Label used for aggregation. S-Label used for aggregation.
A node operating on a DetNet flow in the Detnet service sub- A node operating on a DetNet flow in the Detnet service sub-layer,
layer,uses the local context associated with that S-Label, provided uses the local context associated with that S-Label, provided by a
by a received F-Label, to determine what local DetNet operation(s) received F-Label, to determine what local DetNet operation(s) are
are applied to that packet. An S-Label may be taken from the applied to that packet. An S-Label may be taken from the platform
platform label space [RFC3031], making it unique, enabling DetNet label space [RFC3031], making it unique, enabling DetNet flow
flow identification regardless of which input interface or LSP the identification regardless of which input interface or LSP the packet
packet arrives on. arrives on.
The DetNet forwarding sub-layer is supported by zero or more The DetNet forwarding sub-layer is supported by zero or more
forwarding labels (F-Labels). MPLS Traffic Engineering forwarding labels (F-Labels). MPLS Traffic Engineering
encapsulations and mechanisms can be utilized to provide a forwarding encapsulations and mechanisms can be utilized to provide a forwarding
sub-layer that is responsible for providing resource allocation and sub-layer that is responsible for providing resource allocation and
explicit routes. explicit routes.
3.2. DetNet MPLS Data Plane Scenarios 3.2. DetNet MPLS Data Plane Scenarios
DetNet MPLS Relay Transit Relay DetNet MPLS DetNet MPLS Relay Transit Relay DetNet MPLS
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service they require and encapsulating them accordingly. An edge service they require and encapsulating them accordingly. An edge
node may participate in the packet replication and duplicate packet node may participate in the packet replication and duplicate packet
elimination. elimination.
The DetNet-aware forwarder selects the egress DetNet member flow The DetNet-aware forwarder selects the egress DetNet member flow
segment based on the flow identification. The mapping of ingress segment based on the flow identification. The mapping of ingress
DetNet member flow segment to egress DetNet member flow segment may DetNet member flow segment to egress DetNet member flow segment may
be statically or dynamically configured. Additionally the DetNet- be statically or dynamically configured. Additionally the DetNet-
aware forwarder does duplicate frame elimination based on the flow aware forwarder does duplicate frame elimination based on the flow
identification and the sequence number combination. The packet identification and the sequence number combination. The packet
replication is also done within the DetNet-aware forwarder. During replication is also done within the DetNet-aware forwarder.
elimination and the replication process the sequence number of the
DetNet member flow MUST be preserved and copied to the egress DetNet 4.5.2. Relay Node Processing
member flow.
A DetNet Relay node operates in the DetNet forwarding sub-layer and
service sub-layer. For DetNet using MPLS forwarding related
processing is performed on the F-Label. This processing is done
within an extended forwarder function. Whether an ingress DetNet
member flow receives DetNet specific processing depends on how the
forwarding is programmed. Some relay nodes may be DetNet service
aware for certain DetNet services, while for other DetNet services
these nodes may perform as unmodified LSRs that only understand how
to switch MPLS-TE LSPs, i.e., as a transit nodes, see Section 4.4.
Again, this is entirely up to how the forwarding has been programmed.
During the elimination and replication process the sequence number of
the ingress DetNet member flow MUST be preserved and copied to the
corresponding egress DetNet member flow. Specifically, a relay node
sends the same sequence number in an outgoing packet of a DetNet
member flow that is received in the corresponding incoming packet of
a DetNet compound flow. This is true whether or not PREOF is
performed at the relay node.
The internal design of a relay node is out of scope of this document. The internal design of a relay node is out of scope of this document.
However the reader's attention is drawn to the need to make any PREOF However the reader's attention is drawn to the need to make any PREOF
state available to the packet processor(s) dealing with packets to state available to the packet processor(s) dealing with packets to
which the PREOF functions must be applied, and to maintain that state which the PREOF functions must be applied, and to maintain that state
is such as way that it is available to the packet processor operation is such away that it is available to the packet processor operation
on the next packet in the DetNet flow (which may be a duplicate, a on the next packet in the DetNet flow (which may be a duplicate, a
late packet, or the next packet in sequence. late packet, or the next packet in sequence.
4.5.2. Relay Node Processing
A DetNet Relay node operates in the DetNet forwarding sub-layer .
For DetNet using MPLS this processing is performed on the F-Label.
This processing is done within an extended forwarder function.
Whether an ingress DetNet member flow receives DetNet specific
processing depends on how the forwarding is programmed. Some relay
nodes may be DetNet service aware, while others may be unmodified
LSRs that only understand how to switch MPLS-TE LSPs.
It is also possible to treat the relay node as a transit node, see
Section 4.4. Again, this is entirely up to how the forwarding has
been programmed.
4.6. Forwarding Sub-Layer Considerations 4.6. Forwarding Sub-Layer Considerations
4.6.1. Class of Service 4.6.1. Class of Service
Class and quality of service, i.e., CoS and QoS, are terms that are Class and quality of service, i.e., CoS and QoS, are terms that are
often used interchangeably and confused with each other. In the often used interchangeably and confused with each other. In the
context of DetNet, CoS is used to refer to mechanisms that provide context of DetNet, CoS is used to refer to mechanisms that provide
traffic forwarding treatment based on aggregate group basis and QoS traffic forwarding treatment based on aggregate group basis and QoS
is used to refer to mechanisms that provide traffic forwarding is used to refer to mechanisms that provide traffic forwarding
treatment based on a specific DetNet flow basis. Examples of treatment based on a specific DetNet flow basis. Examples of
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[RFC8655] Finn, N., Thubert, P., Varga, B., and J. Farkas, [RFC8655] Finn, N., Thubert, P., Varga, B., and J. Farkas,
"Deterministic Networking Architecture", RFC 8655, "Deterministic Networking Architecture", RFC 8655,
DOI 10.17487/RFC8655, October 2019, DOI 10.17487/RFC8655, October 2019,
<https://www.rfc-editor.org/info/rfc8655>. <https://www.rfc-editor.org/info/rfc8655>.
10.2. Informative References 10.2. Informative References
[I-D.ietf-detnet-data-plane-framework] [I-D.ietf-detnet-data-plane-framework]
Varga, B., Farkas, J., Berger, L., Malis, A., and S. Varga, B., Farkas, J., Berger, L., Malis, A., and S.
Bryant, "DetNet Data Plane Framework", draft-ietf-detnet- Bryant, "DetNet Data Plane Framework", draft-ietf-detnet-
data-plane-framework-04 (work in progress), February 2020. data-plane-framework-06 (work in progress), May 2020.
[I-D.ietf-detnet-ip] [I-D.ietf-detnet-ip]
Varga, B., Farkas, J., Berger, L., Fedyk, D., Malis, A., Varga, B., Farkas, J., Berger, L., Fedyk, D., and S.
and S. Bryant, "DetNet Data Plane: IP", draft-ietf-detnet- Bryant, "DetNet Data Plane: IP", draft-ietf-detnet-ip-06
ip-05 (work in progress), February 2020. (work in progress), April 2020.
[I-D.ietf-detnet-ip-over-mpls] [I-D.ietf-detnet-ip-over-mpls]
Varga, B., Berger, L., Fedyk, D., Malis, A., Bryant, S., Varga, B., Berger, L., Fedyk, D., Bryant, S., and J.
and J. Korhonen, "DetNet Data Plane: IP over MPLS", draft- Korhonen, "DetNet Data Plane: IP over MPLS", draft-ietf-
ietf-detnet-ip-over-mpls-05 (work in progress), February detnet-ip-over-mpls-06 (work in progress), May 2020.
2020.
[I-D.ietf-detnet-mpls-over-tsn] [I-D.ietf-detnet-mpls-over-tsn]
Varga, B., Farkas, J., Malis, A., and S. Bryant, "DetNet Varga, B., Farkas, J., Malis, A., and S. Bryant, "DetNet
Data Plane: MPLS over IEEE 802.1 Time Sensitive Networking Data Plane: MPLS over IEEE 802.1 Time Sensitive Networking
(TSN)", draft-ietf-detnet-mpls-over-tsn-02 (work in (TSN)", draft-ietf-detnet-mpls-over-tsn-02 (work in
progress), March 2020. progress), March 2020.
[I-D.ietf-detnet-security] [I-D.ietf-detnet-security]
Mizrahi, T. and E. Grossman, "Deterministic Networking Mizrahi, T. and E. Grossman, "Deterministic Networking
(DetNet) Security Considerations", draft-ietf-detnet- (DetNet) Security Considerations", draft-ietf-detnet-
security-09 (work in progress), March 2020. security-10 (work in progress), May 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>.
[RFC2205] Braden, R., Ed., Zhang, L., Berson, S., Herzog, S., and S. [RFC2205] Braden, R., Ed., Zhang, L., Berson, S., Herzog, S., and S.
Jamin, "Resource ReSerVation Protocol (RSVP) -- Version 1 Jamin, "Resource ReSerVation Protocol (RSVP) -- Version 1
Functional Specification", RFC 2205, DOI 10.17487/RFC2205, Functional Specification", RFC 2205, DOI 10.17487/RFC2205,
September 1997, <https://www.rfc-editor.org/info/rfc2205>. September 1997, <https://www.rfc-editor.org/info/rfc2205>.
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