Internet DRAFT - draft-li-apn-ipv6-encap
draft-li-apn-ipv6-encap
Network Working Group Z. Li
Internet-Draft S. Peng
Intended status: Standards Track Huawei Technologies
Expires: 11 January 2024 C. Xie
China Telecom
10 July 2023
Application-aware IPv6 Networking (APN6) Encapsulation
draft-li-apn-ipv6-encap-07
Abstract
Application-aware IPv6 Networking (APN6) makes use of IPv6
encapsulation to convey the APN Attribute along with data packets and
make the network aware of data flow requirements at different
granularity levels. The APN attribute can be encapsulated in the APN
header. This document defines the encapsulation of the APN header in
the IPv6 data plane.
Status of This Memo
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This Internet-Draft will expire on 11 January 2024.
Copyright Notice
Copyright (c) 2023 IETF Trust and the persons identified as the
document authors. All rights reserved.
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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. Requirements Language . . . . . . . . . . . . . . . . . . . . 3
3. Terminologies . . . . . . . . . . . . . . . . . . . . . . . . 3
4. The APN Option . . . . . . . . . . . . . . . . . . . . . . . 3
5. Locations for the APN Option . . . . . . . . . . . . . . . . 4
5.1. IPv6 Hop-by-Hop Options Header (HBH) . . . . . . . . . . 4
5.2. IPv6 Destination Options Header (DOH) . . . . . . . . . . 4
6. APN TLV for the SRH . . . . . . . . . . . . . . . . . . . . . 4
7. Implementation Status . . . . . . . . . . . . . . . . . . . . 5
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
8.1. IPv6 Header Option . . . . . . . . . . . . . . . . . . . 6
8.2. SRH TLV Type . . . . . . . . . . . . . . . . . . . . . . 6
9. Security Considerations . . . . . . . . . . . . . . . . . . . 6
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
10.1. Normative References . . . . . . . . . . . . . . . . . . 6
10.2. Informative References . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
1. Introduction
Application-aware Networking (APN) is introduced in
[I-D.li-apn-framework] and [I-D.li-apn-problem-statement-usecases].
APN conveys an attribute along with data packets into the network and
make the network aware of data flow requirements at different
granularity levels. Such an attribute is acquired, constructed as a
structured value, and then encapsulated in the packets. Such a
structured value is treated as an opaque object in the network, to
which the network operator applies policies in various nodes/service
functions along the path, providing corresponding services.
[I-D.li-apn-header] defines the application-aware networking (APN)
header which can be used in different data planes to carry the APN
attribute. This document defines the encapsulation of the APN header
in the IPv6 data plane.
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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 RFC 2119 [RFC2119] RFC 8174 [RFC8174] when, and only when, they
appear in all capitals, as shown here.
3. Terminologies
APN: Application-aware Networking
APN6: Application-aware IPv6 Networking, i.e., the data plane of APN
is IPv6
APN Attribute: Application-aware information. It is added at the
edge devices of an APN domain along with any tunnel encapsulation.
APN ID: Application-aware Networking ID
APN Para: Application-aware Networking Parameters
SRH: Segment Routing Header RFC 8754 [RFC8754]
4. The APN Option
To support Application-aware IPv6 networking, one IPv6 Header option
RFC 8200 [RFC8200], the APN option, is defined.
The APN option has the following format:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Opt Type = TBD1| Opt Data Len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
. .
. APN Header (Variable) .
. .
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1. The APN Option
where:
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o Opt Type: Type value is TBD1 (suggested value 0x13), an 8-bit
unsigned integer. Identifier of the type of this APN Option.
o Opt Data Len: An 8-bit unsigned integer. Length of the Option Data
field of this option, that is, length of the APN header.
o APN Header: Option-Type-specific data. It carries the APN header.
Variable-length field as specified in [I-D.li-apn-header].
5. Locations for the APN Option
The APN IPv6 Header option can be placed in two locations in an IPv6
packet header RFC 8200 [RFC8200] depend upon the scenario and
implementation requirements. These are defined in the subsections
below.
5.1. IPv6 Hop-by-Hop Options Header (HBH)
The APN option can be carried in the IPv6 Hop-by-Hop Options Header.
By using the HBH Options Header, the information carried can be read
by every node along the path.
5.2. IPv6 Destination Options Header (DOH)
The APN option can be carried in the IPv6 Destination Options Header.
By using the DOH Options Header, the information carried can be read
by the destination node but would not normally be seen by other nodes
along the path.
6. APN TLV for the SRH
[RFC8754] defines the segment routing header (SRH) and the SRH TLV.
The SRH TLV provides meta-data for segment processing. The APN
header can be placed in the SRH as the value of one type of SRH TLV
following the Segment List. By using the SRH, the information
carried can be read by the specified segment destinations along the
SRv6 path.
The APN TLV is OPTIONAL and has the following format:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type = TBD2 | Length |D| RESERVED |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
. .
. APN Header (Variable) .
. .
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2. The APN SRH TLV
where:
o Type: TBD2 (suggested value 0x13).
o Length: The length of the variable length data in bytes.
o D: 1 bit. When it is set, it indicates the Destination Address
verification is disabled due to use of a reduced segment list.
o RESERVED: 15 bits. MUST be 0 on transmission and ignored on
receipt.
o APN Header: It carries the APN header as specified in
[I-D.li-apn-header]. A variable-length field.
7. Implementation Status
Huawei:
Huawei hardware platforms supports APN with current status as
follows:
o Huawei ATN with VRPV8 shipping code.
o Huawei CX600 with VRPV8 shipping code.
o Huawei NE40E with VRPV8 shipping code.
o Huawei ME60 with VRPV8 shipping code.
o Huawei NE5000E with VRPV8 shipping code.
o Huawei NE9000 with VRPV8 shipping code.
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o Huawei NE8000 with VRPV8 shipping code.
Tshinghua University:
o Linux
BUPT (Beijing University of Posts and Telecommunications):
o P4
8. IANA Considerations
IANA is requested to assign two code points as below.
8.1. IPv6 Header Option
IANA is requested to assign an IPv6 Header Option as follows:
Hex Binary Value
Value act chg rest Description Reference
----- --- --- ----- ---------------------------- ---------------
0x13 00 0 10011 Application-aware Networking [this document]
8.2. SRH TLV Type
IANA is requested to assign an SRH TLV Type from the range of type
values for TLVs that do not change en route (2-127) as follows:
Value Description Reference
----- ---------------------------- -----------------
0x13 Application-aware Networking [this document]
9. Security Considerations
The Security Considerations are described in
[I-D.li-apn-problem-statement-usecases].
10. References
10.1. Normative References
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[I-D.li-apn-framework]
Li, Z., Peng, S., Voyer, D., Li, C., Liu, P., Cao, C., and
G. S. Mishra, "Application-aware Networking (APN)
Framework", Work in Progress, Internet-Draft, draft-li-
apn-framework-07, 3 April 2023,
<https://datatracker.ietf.org/doc/html/draft-li-apn-
framework-07>.
[I-D.li-apn-header]
Li, Z., Peng, S., and S. Zhang, "Application-aware
Networking (APN) Header", Work in Progress, Internet-
Draft, draft-li-apn-header-04, 12 April 2023,
<https://datatracker.ietf.org/doc/html/draft-li-apn-
header-04>.
[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>.
[RFC8200] Deering, S. and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", STD 86, RFC 8200,
DOI 10.17487/RFC8200, July 2017,
<https://www.rfc-editor.org/info/rfc8200>.
[RFC8754] Filsfils, C., Ed., Dukes, D., Ed., Previdi, S., Leddy, J.,
Matsushima, S., and D. Voyer, "IPv6 Segment Routing Header
(SRH)", RFC 8754, DOI 10.17487/RFC8754, March 2020,
<https://www.rfc-editor.org/info/rfc8754>.
10.2. Informative References
[I-D.li-apn-problem-statement-usecases]
Li, Z., Peng, S., Voyer, D., Xie, C., Liu, P., Qin, Z.,
and G. S. Mishra, "Problem Statement and Use Cases of
Application-aware Networking (APN)", Work in Progress,
Internet-Draft, draft-li-apn-problem-statement-usecases-
08, 3 April 2023, <https://datatracker.ietf.org/doc/html/
draft-li-apn-problem-statement-usecases-08>.
Authors' Addresses
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Zhenbin Li
Huawei Technologies
Beijing
100095
China
Email: lizhenbin@huawei.com
Shuping Peng
Huawei Technologies
Beijing
100095
China
Email: pengshuping@huawei.com
Chongfeng Xie
China Telecom
China
Email: xiechf@chinatelecom.cn
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