ippm B. Weis
Internet-Draft F. Brockners
Intended status: Standards Track C. Hill
Expires: September 4, 2018 S. Bhandari
V. Govindan
C. Pignataro
Cisco
H. Gredler
RtBrick Inc.
J. Leddy
Comcast
S. Youell
JMPC
T. Mizrahi
Marvell
A. Kfir
B. Gafni
Mellanox Technologies, Inc.
P. Lapukhov
Facebook
M. Spiegel
Barefoot Networks
March 03, 2018
GRE Encapsulation for In-situ OAM Data
draft-weis-ippm-ioam-gre-00
Abstract
In-situ Operations, Administration, and Maintenance (IOAM) records
operational and telemetry information in the packet while the packet
traverses a path between two points in the network. This document
outlines how IOAM data fields are encapsulated in GRE.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
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time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 4, 2018.
Copyright Notice
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document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2.2. Abbreviations . . . . . . . . . . . . . . . . . . . . . . 3
3. In-situ OAM Metadata Transport in GRE . . . . . . . . . . . . 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . 5
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.1. Normative References . . . . . . . . . . . . . . . . . . 5
6.2. Informative References . . . . . . . . . . . . . . . . . 6
Appendix A. Example GRE-IOAM Payloads . . . . . . . . . . . . . 6
A.1. Example GRE-IOAM Tracing Payloads . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
In-situ Operations, Administration, and Maintenance (IOAM) records
operational and telemetry information in the packet while the packet
traverses a path between two points in the network. This document
outlines how IOAM data fields are encapsulated in the Generic Routing
Encapsulation (GRE) [RFC2784].
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2. Conventions
2.1. 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.
2.2. Abbreviations
Abbreviations used in this document:
E2E: Edge-to-Edge
GRE: Generic Routing Encapsulation
IOAM: In-situ Operations, Administration, and Maintenance
OAM: Operations, Administration, and Maintenance
POT: Proof of Transit
3. In-situ OAM Metadata Transport in GRE
GRE encapsulation is defined in [RFC2784]. IOAM encapsulation in GRE
follows the GRE header.
IOAM data fields are carried in GRE using a Protocol Type value of
TBD_IOAM. An IOAM header is added containing the different IOAM data
fields defined in [I-D.ietf-ippm-ioam-data]. In an administrative
domain where IOAM is used, insertion of the IOAM protocol header in
GRE is enabled at the GRE tunnel endpoints, which also serve as IOAM
encapsulating/decapsulating nodes by means of configuration.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
|C| Reserved0 | Ver | Protocol Type = <TBD_IOAM> | G
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ R
| Checksum (optional) | Reserved1 (Optional) | E
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
| IOAM-Type | IOAM HDR len| Next Protocol | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ I
! | O
! | A
~ IOAM Option and Data Space ~ M
| | |
| | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
| |
| Payload + Padding (L2/L3/ESP/...) |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The GRE header and fields are defined in [RFC2784]. The GRE Protocol
Type value is TBD_IOAM.
The IOAM header is defined as follows.
IOAM Type: 8-bit field defining the IOAM Option type, as defined in
Section 7.2 of [I-D.ietf-ippm-ioam-data].
IOAM HDR Len: 8 bits Length field contains the length of the
variable IOAM data octets in 4-octet units.
Next Protocol: 16 bits Next Protocol Type field contains the
protocol type of the packet following IOAM protocol header. When
the most significant octet is 0x00, the Protocol Type is taken to
be an IP Protocol Number as defined in [IP-PROT]. Otherwise, the
Protocol Type is defined to be an EtherType value from [ETYPES].
An implementation receiving a packet containing a Protocol Type
which is not listed in one of those registries SHOULD discard the
packet.
IOAM Option and Data Space: IOAM option header and data is present
as specified by the IOAM-Type field, and is defined in Section 4
of [I-D.ietf-ippm-ioam-data].
Multiple IOAM options MAY be included within the GRE encapsulation.
For example, if a GRE encapsulation contains two IOAM options before
a data packet, the Next Protocol field of the first IOAM option will
contain the value of TBD_IOAM, while the Next Protocol field of the
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second IOAM option will contain the Ethertype or IP protocol Number
indicating the type of the data packet.
4. Security Considerations
This document describes the encapsulation of IOAM data fields in GRE.
Security considerations of the specific IOAM data fields for each
case (i.e., Trace, Proof of Transit, and E2E) are described in
defined in [I-D.ietf-ippm-ioam-data].
As this document describes new protocol fields within the existing
GRE encapsulation, these are similar to the security considerations
of [RFC2784].
IOAM data transported in an OAM E2E header SHOULD be integrity
protected (e.g., with IPsec ESP [RFC4303]) to detect changes made by
a device between the sending and receiving OAM endpoints.
5. IANA Considerations
A new EtherType value is requested to be added to the [ETYPES] IANA
registry. The description should be "In-situ OAM (IOAM)".
6. References
6.1. Normative References
[ETYPES] "IANA Ethernet Numbers",
<https://www.iana.org/assignments/ieee-802-numbers/ieee-
802-numbers.xhtml>.
[I-D.ietf-ippm-ioam-data]
Brockners, F., Bhandari, S., Pignataro, C., Gredler, H.,
Leddy, J., Youell, S., Mizrahi, T., Mozes, D., Lapukhov,
P., Chang, R., and d. daniel.bernier@bell.ca, "Data Fields
for In-situ OAM", draft-ietf-ippm-ioam-data-01 (work in
progress), October 2017.
[IP-PROT] "IANA Protocol Numbers",
<https://www.iana.org/assignments/protocol-numbers/
protocol-numbers.xhtml>.
[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>.
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[RFC2784] Farinacci, D., Li, T., Hanks, S., Meyer, D., and P.
Traina, "Generic Routing Encapsulation (GRE)", RFC 2784,
DOI 10.17487/RFC2784, March 2000, <https://www.rfc-
editor.org/info/rfc2784>.
[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>.
6.2. Informative References
[RFC4303] Kent, S., "IP Encapsulating Security Payload (ESP)", RFC
4303, DOI 10.17487/RFC4303, December 2005,
<https://www.rfc-editor.org/info/rfc4303>.
Appendix A. Example GRE-IOAM Payloads
A.1. Example GRE-IOAM Tracing Payloads
TBD
Authors' Addresses
Brian Weis
Cisco Systems, Inc.
170 W. Tasman Drive
San Jose, California 95134-1706
USA
Phone: +1-408-526-4796
Email: bew@cisco.com
Frank Brockners
Cisco Systems, Inc.
Hansaallee 249, 3rd Floor
DUESSELDORF, NORDRHEIN-WESTFALEN 40549
Germany
Email: fbrockne@cisco.com
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Craig Hill
Cisco Systems, Inc.
13600 Dulles Technology Drive
Herndon, Virginia 20171
United States
Email: crhill@cisco.com
Shwetha Bhandari
Cisco Systems, Inc.
Cessna Business Park, Sarjapura Marathalli Outer Ring Road
Bangalore, KARNATAKA 560 087
India
Email: shwethab@cisco.com
Vengada Prasad Govindan
Cisco Systems, Inc.
Email: venggovi@cisco.com
Carlos Pignataro
Cisco Systems, Inc.
7200-11 Kit Creek Road
Research Triangle Park, NC 27709
United States
Email: cpignata@cisco.com
Hannes Gredler
RtBrick Inc.
Email: hannes@rtbrick.com
John Leddy
Comcast
Email: John_Leddy@cable.comcast.com
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Stephen Youell
JP Morgan Chase
25 Bank Street
London E14 5JP
United Kingdom
Email: stephen.youell@jpmorgan.com
Tal Mizrahi
Marvell
6 Hamada St.
Yokneam 20692
Israel
Email: talmi@marvell.com
Aviv Kfir
Mellanox Technologies, Inc.
350 Oakmead Parkway, Suite 100
Sunnyvale, CA 94085
U.S.A.
Email: avivk@mellanox.com
Barak Gafni
Mellanox Technologies, Inc.
350 Oakmead Parkway, Suite 100
Sunnyvale, CA 94085
U.S.A.
Email: gbarak@mellanox.com
Petr Lapukhov
Facebook
1 Hacker Way
Menlo Park, CA 94025
US
Email: petr@fb.com
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Mickey Spiegel
Barefoot Networks
2185 Park Boulevard
Palo Alto, CA 94306
US
Email: mspiegel@barefootnetworks.com
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