DetNet Queuing Option for IPv6
draft-xiong-detnet-6man-queuing-option-00
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| Document | Type |
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|---|---|---|---|
| Authors | Quan Xiong , Aihua Liu | ||
| Last updated | 2022-04-21 | ||
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draft-xiong-detnet-6man-queuing-option-00
DETNET Q. Xiong
Internet-Draft A. Liu
Intended status: Standards Track ZTE Corporation
Expires: 21 October 2022 April 2022
DetNet Queuing Option for IPv6
draft-xiong-detnet-6man-queuing-option-00
Abstract
This document introduces new IPv6 options to signal the DetNet
queuing related information for DetNet flows in IPv6 and SRv6
networks.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on 3 October 2022.
Copyright Notice
Copyright (c) 2022 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
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Please review these documents carefully, as they describe your rights
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions used in this document . . . . . . . . . . . . . . 3
2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Requirements Language . . . . . . . . . . . . . . . . . . 3
3. The DetNet Options . . . . . . . . . . . . . . . . . . . . . 3
3.1. The Queuing information Option . . . . . . . . . . . . . 3
4. Encapsulation of DetNet Options . . . . . . . . . . . . . . . 5
4.1. IPv6 Networks . . . . . . . . . . . . . . . . . . . . . . 5
4.2. SRv6 Networks . . . . . . . . . . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . 6
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
8. Normative References . . . . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
1. Introduction
According to [RFC8655], Deterministic Networking (DetNet) operates at
the IP layer and delivers service which provides extremely low data
loss rates and bounded latency within a network domain. DetNet data
planes has been specified in [RFC8938]. The existing deterministic
technologies are facing large-scale number of nodes and long-distance
transmission, traffic scheduling, dynamic flows, and other
controversial issues in large-scale networks. [draft-liu-detnet-
large-scale-requirements] has described the enhancement requirements
for DetNet data plane.
It is required to support a data plane method of packet treatment
including forwarding, service protection, and queuing over Layer 3.
As defined in [RFC8939], the DetNet IP data plane primarily uses 6-
tuple-based flow identification. It is required to carry Redundancy
information for service protection enhancement and explicit path
indicator for forwarding enhancement in a native IP packet such as
IPv6 and SRv6. The [draft-pthubert-detnet-ipv6-hbh] has proposed
Redundancy Information Option and Path Options for IPv6 and SRv6 data
plane.
As described in [draft-ietf-detnet-bounded-latency], the end-to-end
bounded latency depends on the value of queuing delay bound along
with the queuing mechanisms. Mutiple queueing mechanisms can be used
to ganrantee the bounded latency in DetNet. And many types of
queueing mechanisms have been proposed to provide diversified
deterministic service for various applications. For example, time-
scheduling queuing mechanisms includes the Time Aware Shaping
[IIEEE802.1Qbv] and priority-scheduling includes the Credit-Based
Shaper[IEEE802.1Q-2014] with Asynchronous Traffic
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Shaping[IEEE802.1Qcr]. The cyclic-scheduling queueing mechanism has
been proposed in [IEEE802.1Qch] and improved in [draft-dang-queuing-
with-multiple-cyclic-buffers]. The deadline-scheduling queueing
mechanism has been proposed in [draft-stein-srtsn] and improved in
[draft-peng-detnet-deadline-based-forwarding]. The per-flow queueing
mechanism includes Guaranteed-Service Integrated service (IntServ)
[RFC2212]. It is required to carry queuing related information in
data plane so as to make appropriate packet forwarding and scheduling
decisions to meet the time bounds. The DetNet forwarding nodes along
the path can follow the queue scheduling carried in the packet to
achieve the end-to-end bounded latency.
This document introduces new IPv6 options to signal the DetNet
queuing related information for DetNet flows in IPv6 and SRv6
networks.
2. Conventions used in this document
2.1. Terminology
The terminology is defined as [RFC8655].
2.2. 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. The DetNet Options
This document defines new IPv6 options for DetNet to signal queuing
information to the DetNet layers. The format of the options follow
the generic definition in section 4.2 of [RFC8200]. The option may
be placed either in an HbH or a DoH EH.
3.1. The Queuing information Option
The DetNet Queuing Information Option helps to discriminate the types
of queuing mechanisms and specify the queuing parameters.
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Option Type | Opt Data Len | Queuing Type | TU| QDL | QPL |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Maximum Queuing Delay (variable) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Maximum Queuing Delay variation (variable) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Queuing Parameters (variable) (optional) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: Queuing Information Option Format
Option Type: 8-bit identifier of the type of option. Value TBD by
IANA; the highest-order 3 bits of thie field is 001 to skip over this
option and continue processing the header if the processing IPv6 node
does not recognize the Option Type and to permit the Option Data to
be changed en route to the packet's final destination.
Opt Data Len: 8-bit unsigned integer. Length of the Option Data
field of this option, in octets. It is set to 12.
Queuing Type(8 bits): indicates the type of queuing mechanisms. The
types of queuing mechanisms should cover time-scheduling, priority-
scheduling, cyclic-scheduling, deadline-scheduling and per-flow
scheduling queuing mechanisms. Other type of queuing mechanisms can
be taken into considerations in the future.
TU(2 bits): indicates the time units for Queuing Delay.
ODL(3 bits): Length of the Queuing Delay field as an unsigned 3-bit
integer.
OPL(3 bits): Length of the Queuing Parameters field as an unsigned
3-bit integer.
Maximum Queuing Delay (variable): indicates the Maximum queuing
delay. The value is various when the Queuing type is different.
Maximum Queuing Delay variation (variable): indicates the Maximum
queuing delay variation. The value is various when the Queuing type
is different.
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Queuing Parameters(variable): it is optional and based on the Queuing
type. For example, Cycle Profile ID and Cycle ID may be carried for
cyclic-scheduling queuing mechanisms. Deadline-scheduling queuing
mechanisms should carry information such as planned Deadline and
deadline Deviation and so on.
4. Encapsulation of DetNet Options
4.1. IPv6 Networks
The DetNet Queuing information Option is intended to be placed in an
IPv6 HbH EH since it must be processed by every DetNet forwarding
node along the path. All DetNet forwarding nodes can use the queuing
information to achieve the packet forwarding and queue scheduling.
+-----------------------------------+
| DetNet App-Flow |
| (original IP) Packet |
+-----------------------------------+
| other EHs |
+-----------------------------------+--\
| IPv6 Hop-by-Hop Ex Hdr | |
|(DetNet Queuing information Option)| DetNet Options
| | |
+-----------------------------------+--/
| IPv6 Header |
+-----------------------------------+
| Data-Link |
+-----------------------------------+
| Physical |
+-----------------------------------+
Figure 2: Queuing Information Option Format
4.2. SRv6 Networks
The DetNet Queuing information Option is intended to be placed in an
DOH EH before an SRH since it must be processed by the DetNet
forwarding nodes of the SRv6 segment list. The DetNet forwarding
nodes among SRv6 segment list can use the queuing information to
achieve the packet forwarding and queue scheduling.
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+-----------------------------------+
| DetNet App-Flow |
| (original IP) Packet |
+-----------------------------------+
| Segment Routing Header |
+-----------------------------------+ ---\
| IPv6 Destination Ex Hdr | |
|(DetNet Queuing information Option)| DetNet Options
| | |
+-----------------------------------+ ---/
| IPv6 Header |
+-----------------------------------+
| Data-Link |
+-----------------------------------+
| Physical |
+-----------------------------------+
Figure 3: Queuing Information Option Format
5. Security Considerations
TBA
6. Acknowledgements
The authors would like to thank Peng Liu, Bin Tan, Aihua Liu Shaofu
Peng for their review, suggestions and comments to this document.
7. IANA Considerations
TBA
8. Normative References
[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>.
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[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., "Deterministic Networking (DetNet) Data Plane
Framework", RFC 8938, DOI 10.17487/RFC8938, November 2020,
<https://www.rfc-editor.org/info/rfc8938>.
[RFC8939] Varga, G., Ed., "Deterministic Networking (DetNet) Data
Plane: IP", RFC 8939, DOI 10.17487/RFC8939, November 2020,
<https://www.rfc-editor.org/info/rfc8939>.
Authors' Addresses
Quan Xiong
ZTE Corporation
No.6 Huashi Park Rd
Wuhan
Hubei, 430223
China
Email: xiong.quan@zte.com.cn
Aihua Liu
ZTE Corporation
Shenzhen
China
Email: liu.aihua@zte.com.cn
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