Export of Segment Routing IPv6 Information in IP Flow Information Export (IPFIX)
draft-tgraf-opsawg-ipfix-srv6-srh-00
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| Document | Type |
This is an older version of an Internet-Draft whose latest revision state is "Replaced".
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|---|---|---|---|
| Author | Thomas Graf | ||
| Last updated | 2022-01-15 | ||
| Replaced by | draft-ietf-opsawg-ipfix-srv6-srh, RFC 9487 | ||
| RFC stream | (None) | ||
| Formats | |||
| Stream | Stream state | (No stream defined) | |
| Consensus boilerplate | Unknown | ||
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draft-tgraf-opsawg-ipfix-srv6-srh-00
Network Working Group T. Graf
Internet-Draft Swisscom
Intended status: Informational 15 January 2022
Expires: 19 July 2022
Export of Segment Routing IPv6 Information in
IP Flow Information Export (IPFIX)
draft-tgraf-opsawg-ipfix-srv6-srh-00
Abstract
This document introduces new IP Flow Information Export (IPFIX) code
points to identify which traffic is being forwarded with which
Segemnt Routing Header dimensions based on which SRv6 control plane
protocol.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on 19 July 2022.
Copyright Notice
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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. IPFIX Information Elements . . . . . . . . . . . . . . . . . 2
3. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
5. Security Considerations . . . . . . . . . . . . . . . . . . . 5
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
7.1. Normative References . . . . . . . . . . . . . . . . . . 5
7.2. Informative References . . . . . . . . . . . . . . . . . 6
Appendix A. IPFIX Encoding Example . . . . . . . . . . . . . . . 7
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction
A new type of Routing Extension Header called Segment Routing Header
(SRH) is defined by [RFC8754] which is used for applying Segment
Routing (SR) on the IPv6 data plane.
Three routing protocol extensions, OSPFv3 Extensions
[I-D.li-lsr-ospfv3-srv6-extensions], IS-IS Extensions
[I-D.ietf-lsr-isis-srv6-extensions], BGP Prefix Segment Identifiers
(Prefix-SIDs) [I-D.ietf-bess-srv6-services] and one Path Computation
Element Communication Protocol (PCEP) Extension
[I-D.ietf-pce-segment-routing-ipv6] have been defined to be able to
propagate Segment Identifiers (SIDs) for the IPv6 data plane.
This document defines five new IPFIX Information Elements (IEs) and
two new subregistries within the "IPFIX Information Elements"
registry [RFC7012] for the new SRH dimensions and routing protocol
and PCEP extensions.
2. IPFIX Information Elements
This section defines and describes the new IPFIX IEs.
ipv6SRHFlags
8-bit flags defined in the SRH.
ipv6SRHTag
16-bit tag field defined in the SRH that marks a packet as part of
a class or group of packets sharing the same set of properties.
ipv6SRHSegment
128-bit IPv6 address that represents an SRv6 segment.
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ipv6SRHSegmentList
Ordered basicList of zero or more 128-bit IPv6 addresses in the
SRH that represents the SRv6 segment list. The Segment List is
encoded starting from the last segment of the SR Policy.
ipv6SRHSegmentType
Name of the routing protocol or PCEP extension from where last
SRv6 segment has been learned from.
3. Use Cases
By using ipv6SRHSegmentList(TBD5), ipv6SRHSegment1Type(TBD6) and
forwardingStatus(89) it is possible to identify
* how many packets are forwarded or dropped
* if dropped, for which reasons, and
* infer control plane protocol for the last segment
* and the SRv6 segment list on every hop.
4. IANA Considerations
This document requests IANA to create new IEs and two new subregistry
called ""IPFIX IPv6 SRH Flags (TBD1)" and IPFIX IPv6 SRH Segment type
(TBD5)" under the "IPFIX Information Elements" registry [RFC7012]
available at [IANA-IPFIX] and assign the following code points.
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+--------+-------------------+------------+-----------+-------------+
| Element| Name | Abstract | Data Type | Reference |
| ID | | Data Type | Semantics | |
+--------+-------------------+------------+-------------------------+
| TBD1 | ipv6SRHFlag | unsigned8 | flags | [RFC-to-be],|
| | | | | RFC8754 |
+--------+-------------------+------------+-------------------------+
| TBD2 | ipv6SRHTag | unsigned16 | identifier| [RFC-to-be],|
| | | | | RFC8754 |
+--------+-------------------+------------+-------------------------+
| TBD3 | ipv6SRHSegment | ipv6address| default | [RFC-to-be],|
| | | | | RFC8754 |
+--------+-------------------+------------+-------------------------+
| TBD4 | ipv6SRHSegmentList| basiclist | list | [RFC-to-be],|
| | | | | RFC8754 |
+--------+-------------------+------------+-------------------------+
| TBD5 | ipv6SRHSegmentType| unsigned8 | identifier| [RFC-to-be] |
+--------+-------------------+------------+-------------------------+
Table 1: Creates IEs in the "IPFIX Information Elements" registry
+--------+-------------------+--------------------------------------+
| Value | Description | Reference |
+--------+-------------------+--------------------------------------+
| 0-7 | Unassigned | |
+--------+-------------------+--------------------------------------+
Table 2: Creates "IPFIX IPv6 SRH Flags (TBD1)" subregistry
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+-------+--------------------+--------------------------------------+
| Value | Description | Reference |
+-------+--------------------+--------------------------------------+
| TBD6 | Unknown | [RFC-to-be] |
| | | |
+-------+--------------------+--------------------------------------+
| TBD7 | Path Computation | [RFC-to-be], |
| | Element | draft-ietf-pce-segment-routing-ipv6 |
+-------+--------------------+--------------------------------------+
| TBD8 | OSPFv3 | [RFC-to-be], |
| | Segment Routing | draft-li-ospf-ospfv3-srv6-extensions |
+-------+--------------------+--------------------------------------+
| TBD9 | IS-IS | [RFC-to-be] |
| | Segment Routing | draft-ietf-lsr-isis-srv6-extensions |
+-------+--------------------+--------------------------------------+
| TBD10 | BGP Segment | [RFC-to-be], |
| | Routing Prefix-SID | draft-ietf-bess-srv6-services |
+-------+--------------------+--------------------------------------+
Table 3: Creates "IPFIX IPv6 SRH Segment type (TBD5)" subregistry
Note to the RFC-Editor:
* Please replace TBD1 - TBD10 with the values allocated by IANA
* Please replace the [RFC-to-be] with the RFC number assigned to
this document
5. Security Considerations
There exists no significant extra security considerations regarding
the allocation of these new IPFIX IEs compared to [RFC7012].
6. Acknowledgements
TBD
7. References
7.1. Normative References
[RFC6313] Claise, B., Dhandapani, G., Aitken, P., and S. Yates,
"Export of Structured Data in IP Flow Information Export
(IPFIX)", RFC 6313, DOI 10.17487/RFC6313, July 2011,
<https://www.rfc-editor.org/info/rfc6313>.
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[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>.
7.2. Informative References
[I-D.ietf-bess-srv6-services]
Dawra, G., Filsfils, C., Talaulikar, K., Raszuk, R.,
Decraene, B., Zhuang, S., and J. Rabadan, "SRv6 BGP based
Overlay Services", Work in Progress, Internet-Draft,
draft-ietf-bess-srv6-services-08, 10 November 2021,
<https://www.ietf.org/archive/id/draft-ietf-bess-srv6-
services-08.txt>.
[I-D.ietf-lsr-isis-srv6-extensions]
Psenak, P., Filsfils, C., Bashandy, A., Decraene, B., and
Z. Hu, "IS-IS Extensions to Support Segment Routing over
IPv6 Dataplane", Work in Progress, Internet-Draft, draft-
ietf-lsr-isis-srv6-extensions-18, 20 October 2021,
<https://www.ietf.org/archive/id/draft-ietf-lsr-isis-srv6-
extensions-18.txt>.
[I-D.ietf-pce-segment-routing-ipv6]
Li, C., Negi, M., Sivabalan, S., Koldychev, M.,
Kaladharan, P., and Y. Zhu, "PCEP Extensions for Segment
Routing leveraging the IPv6 data plane", Work in Progress,
Internet-Draft, draft-ietf-pce-segment-routing-ipv6-11, 10
January 2022, <https://www.ietf.org/internet-drafts/draft-
ietf-pce-segment-routing-ipv6-11.txt>.
[I-D.li-lsr-ospfv3-srv6-extensions]
Li, Z., Hu, Z., Cheng, D., Talaulikar, K., and P. Psenak,
"OSPFv3 Extensions for SRv6", Work in Progress, Internet-
Draft, draft-li-lsr-ospfv3-srv6-extensions-00, 15 January
2020, <https://www.ietf.org/archive/id/draft-li-lsr-
ospfv3-srv6-extensions-00.txt>.
[IANA-IPFIX]
"IANA, "IP Flow Information Export (IPFIX) Entities"",
<https://www.iana.org/assignments/ipfix/ipfix.xhtml>.
[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>.
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Appendix A. IPFIX Encoding Example
In this section an example is provided to show the encoding format
for the newly introduced IEs.
+-----+------+-----+--------+---------------------------------------|
| SRH | SRH | SRH | Segment| Segment List |
| Nr | Flags| Tag | Type | |
+-----+------+-----+--------+---------------------------------------+
| 1 | 0 | 123 | IS-IS | 2001:db8::1, 2001:db8::2, 2001:db8::3 |
+-----+------+-----+--------+---------------------------------------+
| 2 | 0 | 456 | IS-IS | 2001:db8::4, 2001:db8::5 |
+-----+------+-----+--------+---------------------------------------+
| 3 | 0 | 789 | IS-IS | 2001:db8::6 |
+-----+------+-----+--------+---------------------------------------+
Table 4: 3 observed SRH headers and their routing protocol
A.1. Template Record
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SET ID = 2 | Length = 41 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Template ID = 256 | Field Count = 4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0| ipv6SRHFlags = TBD2 | Field Length = 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0| ipv6SRHTag = TBD3 | Field Length = 2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0| ipv6SRHSegmentType = TBD6 | Field Length = 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0| ipv6SRHSegment = TBD4 | Field Length = 16 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0| ipv6SRHSegmentList = TBD5 | Field Length = 0xFFFF |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Table 4: Template Record Encoding Format
In this example, the Template ID is 256, which will be used in the
Data Record. The field length for ipv6SRHSegmentList is 0xFFFF,
which means the length of this IE is variable, and the actual length
of this IE is indicated by the List Length field in the basicList
format as per [RFC6313].
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A.2. Data Set
The data set is represented as follows:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SET ID = 256 | Length = 136 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ipv6SRHFlags | ipv6SRHTag = 123 | ipv6SRHSegment|
| = 0 | | Type = TBD9 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 255 | List Length = 53 |semantic= |
| | |ordered |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ipv6SRHSegment = TBD4 | Field Length = 16 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Segment List[0] = 2001:db8::1 (16 bytes) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Segment List[1] = 2001:db8::2 (16 bytes) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Segment List[2] = 2001:db8::3 (16 bytes) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ipv6SRHFlags | ipv6SRHTag = 456 | ipv6SRHSegment|
| = 0 | | Type = TBD9 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 255 | List Length = 37 |semantic= |
| | |ordered |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ipv6SRHSegment = TBD4 | Field Length = 16 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Segment List[0] = 2001:db8::4 (16 bytes) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Segment List[1] = 2001:db8::5 (16 bytes) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ipv6SRHFlags | ipv6SRHTag = 789 | ipv6SRHSegment|
| = 0 | | Type = TBD9 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 255 | List Length = 21 |semantic= |
| | |ordered |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ipv6SRHSegment = TBD4 | Field Length = 16 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Segment List[0] = 2001:db8::6 (16 bytes) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Table 5: Data Set Encoding Format
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Author's Address
Thomas Graf
Swisscom
Binzring 17
CH-8045 Zurich
Switzerland
Email: thomas.graf@swisscom.com
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