Export of Gigabit Passive Optical Network Encapsulation Mode in IP Flow Information Export (IPFIX)
draft-netana-opsawg-ipfix-gpon-gem-00
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| Document | Type | Active Internet-Draft (individual) | |
|---|---|---|---|
| Authors | Thomas Graf , Haomian Zheng | ||
| Last updated | 2025-04-07 | ||
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draft-netana-opsawg-ipfix-gpon-gem-00
OPSAWG T. Graf
Internet-Draft Swisscom
Intended status: Standards Track H. Zheng
Expires: 9 October 2025 Huawei Technologies
7 April 2025
Export of Gigabit Passive Optical Network Encapsulation Mode in IP Flow
Information Export (IPFIX)
draft-netana-opsawg-ipfix-gpon-gem-00
Abstract
This document introduces new IP Flow Information Export (IPFIX)
Information Elements to identify a set of G-PON Encapsulation Method
entities in the Passive Optical Transport of the Optical Distribution
Network.
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 9 October 2025.
Copyright Notice
Copyright (c) 2025 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 (https://trustee.ietf.org/
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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. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. New IPFIX G-PON GEM Elements . . . . . . . . . . . . . . . . 4
4. Sample Use Cases . . . . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
5.1. New IPFIX G-PON GEM Information Elements . . . . . . . . 5
5.1.1. gponGemPti . . . . . . . . . . . . . . . . . . . . . 5
5.1.2. gponGemPortId . . . . . . . . . . . . . . . . . . . . 6
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6
7. Implementation Status . . . . . . . . . . . . . . . . . . . . 6
7.1. Huawei MA5800T-X17 . . . . . . . . . . . . . . . . . . . 6
8. Security Considerations . . . . . . . . . . . . . . . . . . . 6
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 7
9.1. Normative References . . . . . . . . . . . . . . . . . . 7
9.2. Informative References . . . . . . . . . . . . . . . . . 7
Appendix A. IPFIX Encoding Examples . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
The G-PON Encapsulation Method (GEM) data plane header defined in
Section 8.3.1 of [itu-g984-3] facilitates the framing, error control,
payload type identification and payload separation in the Optical
Distribution Network. It is being used in the Optical Distribution
Network between the Optical Line Termination (OLT) at the network
operator and the Optical Network Unit (ONU), Optical Network Terminal
(ONT) at the end user in the passive optical transport within the
broadband access domain.
IPFIX is widely applied in the broadband access domain to gain
visibility into the forwarding and data plane. However, that
visibility is today constraint to the ethernet, IP and application
transport properties of the data plane.
This document specifies two IPFIX Information Elements (IEs) to
facilitate visibility in the GEM data plane.
Figure 1 shows the GEM frame, the GEM header and its properties.
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GEM Frame
|<------------------------------------------------------>|
| |
+--------------+-----------------------------------------+
| GEM Header | GEM Payload |
+--------------+-----------------------------------------+
/ |
/ --------------\
/ --------------\
/ -----------\
v v
+----------------+----------------+---------+------------------+
| PLI | Port-ID | PTI | HEC |
| (12-bits) | (12-bits) | (3-bits)| (13-bits) |
+----------------+----------------+---------+------------------+
Figure 1: G.984.3 GEM header and frame structure
These IEs are used to export the GEM Port-ID and PTI to enable the
distinction between user service and user and OAM application frames.
Some examples are provided in Appendix A.
2. Terminology
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.
This document makes use of the terms defined in [RFC7011],
[itu-g984-1] and [itu-g984-3].
The following terms are used as defined in [RFC7011]:
* IPFIX
* IPFIX Information Elements
* Template
* Template Record
* Options Template
* Options Template Record
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* Data Record
* Data Set
The following terms are used as defined in [itu-g984-1]:
* Optical Access Network (OAN)
* Optical Distribution Network (ODN)
* Optical Line Termination (OLT)
* Optical Network Termination (ONT)
* Optical Network Unit (ONU)
The following terms are used as defined in [itu-g984-3]:
* G-PON Encapsulation Method (GEM)
* GEM Port
* Gigabit-capable Passive Optical Network (G-PON)
3. New IPFIX G-PON GEM Elements
This section specifies the new IPFIX G-PON GEM IEs.
gponGemPti
3-bit GEM PTI content type field defined in Section 8.3.1 of
[itu-g984-3].
gponGemPortId
12-bit GEM Port-ID field defined in Section 8.3.1 of [itu-g984-3].
4. Sample Use Cases
The IPFIX IEs gponGemPti (TBD1) or gponGemPortId (TBD2),
sourceMacAddress (56), destinationMacAddress (80), ingressInterface
(10), egressInterface (14) and forwardingStatus (89)[RFC5102]
[RFC7270] [IANA-IPFIX], and some existing counter informations
[IANA-IPFIX] providing answers to the following questions (amongst
others):
* How many user or OAM frames are forwarded or dropped to which ONU
on which egress interface and GEM Port-ID?
* If dropped, for which reasons?
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The received ONU frames on an OLT are mapped and forwarded depending
on GEM Port-ID to a dot1qVlanId (243) and dot1qPriority (244)
upstream to the provider network.
5. IANA Considerations
Note to the RFC-Editor:
* Please replace TBD1 - TBD2 with the values allocated by IANA
* Please replace the [RFC-to-be] with the RFC number assigned to
this document
5.1. New IPFIX G-PON GEM Information Elements
This document requests IANA to add new IEs (Section 5.1) to the
"IPFIX Information Elements" registry [RFC7012] available at
[IANA-IPFIX].
Table 1 lists the new G-PON GEM IEs:
+-------+--------------------------------+
|Element| Name |
| ID | |
+-------+--------------------------------+
| TBD1 | gponGemPti |
| | |
+-------+--------------------------------+
| TBD2 | gponGemPortId |
| | |
+-------+--------------------------------+
Table 1: New G-PON GEM IEs in the "IPFIX Information Elements" Registry
5.1.1. gponGemPti
Name: gponGemPti
ElementID: TBD1
Description: The 3-bit GEM PTI content type field defined in
Section 8.3.1 of [itu-g984-3].
Abstract Data Type: unsigned8
Data Type Semantics: flags
Additional Information: See Section 8.3.1 of [itu-g984-3] for the
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content type list.
Reference: [RFC-to-be]
5.1.2. gponGemPortId
Name: gponGemPortId
ElementID: TBD2
Description: The 12-bit GEM Port-ID field defined in Section 8.3.1
of [itu-g984-3].
Abstract Data Type: unsigned16
Data Type Semantics: identifier
Additional Information: See Section 8.3.1 of [itu-g984-3] for the
content type list.
Reference: [RFC-to-be]
6. Acknowledgements
The authors would like to thank xxx for their review and valuable
comments, and xxx for the implementation and validation.
7. Implementation Status
Note to the RFC-Editor: Please remove this section before publishing.
7.1. Huawei MA5800T-X17
Huawei plans to implement the following IEs as part of a production
implementation in the VRP based MA5800T-X17 OLT platform:
* gponGemPortId
The implementation will be validated in an upcoming IETF hackathon.
8. Security Considerations
There exists no extra security considerations regarding allocation of
these new IPFIX IEs compared to [RFC7012].
The IEs described in this document export provider plane data metrics
on how frames are being forwarded within an Optical Access Network.
Applications and operators using the IEs described in this document
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must evaluate the sensitivity of this information in their
implementation context, and apply the data-at-rest storage guidance
in Section 11.8 of [RFC7011] as appropriate.
9. References
9.1. Normative References
[itu-g984-1]
"G.984.1", ITU-T, International Telecommunication Union,
March 2008, <https://www.itu.int/rec/T-REC-G.984.1>.
[itu-g984-3]
"G.984.3", ITU-T, International Telecommunication Union,
January 2024, <https://www.itu.int/rec/T-REC-G.984.3>.
[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>.
[RFC7011] Claise, B., Ed., Trammell, B., Ed., and P. Aitken,
"Specification of the IP Flow Information Export (IPFIX)
Protocol for the Exchange of Flow Information", STD 77,
RFC 7011, DOI 10.17487/RFC7011, September 2013,
<https://www.rfc-editor.org/info/rfc7011>.
[RFC7012] Claise, B., Ed. and B. Trammell, Ed., "Information Model
for IP Flow Information Export (IPFIX)", RFC 7012,
DOI 10.17487/RFC7012, September 2013,
<https://www.rfc-editor.org/info/rfc7012>.
[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>.
9.2. Informative References
[IANA-IPFIX]
"IANA, "IP Flow Information Export (IPFIX) Entities"",
<https://www.iana.org/assignments/ipfix/ipfix.xhtml>.
[RFC5102] Quittek, J., Bryant, S., Claise, B., Aitken, P., and J.
Meyer, "Information Model for IP Flow Information Export",
RFC 5102, DOI 10.17487/RFC5102, January 2008,
<https://www.rfc-editor.org/info/rfc5102>.
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[RFC7270] Yourtchenko, A., Aitken, P., and B. Claise, "Cisco-
Specific Information Elements Reused in IP Flow
Information Export (IPFIX)", RFC 7270,
DOI 10.17487/RFC7270, June 2014,
<https://www.rfc-editor.org/info/rfc7270>.
Appendix A. IPFIX Encoding Examples
TBD.
Authors' Addresses
Thomas Graf
Swisscom
Binzring 17
CH-8045 Zurich
Switzerland
Email: thomas.graf@swisscom.com
Haomian Zheng
Huawei Technologies
H1, Huawei Xiliu Beipo Village, Songshan Lake
Dongguan
Guangdong, 523808
China
Email: zhenghaomian@huawei.com
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