ippm B. Weis
Internet-Draft F. Brockners
Intended status: Standards Track C. Hill
Expires: April 25, 2019 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
October 22, 2018
Ethernet Encapsulation for In-situ OAM Data
draft-weis-ippm-ioam-eth-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 encapsulations using an EtherType to identify IOAM data
fields as the next header in a packet.
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 https://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 April 25, 2019.
Copyright Notice
Copyright (c) 2018 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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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2.2. Abbreviations . . . . . . . . . . . . . . . . . . . . . . 3
3. IOAM Ethertype . . . . . . . . . . . . . . . . . . . . . . . 3
4. Usage Examples of the IOAM Ethertype . . . . . . . . . . . . 4
4.1. Example: GRE Encapsulation of In-situ OAM Date Fields . . 5
4.2. Example: Geneve Encapsulation of IOAM Data Fields . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . 6
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.1. Normative References . . . . . . . . . . . . . . . . . . 7
7.2. Informative References . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
In-situ Operations, Administration, and Maintenance (IOAM) records
operational and telemetry information in the packet while the packet
traverses a particular network domain. The term "in-situ" refers to
the fact that the IOAM data fields are added to the data packets
rather than being sent within packets specifically dedicated to OAM.
This document defines how IOAM data fields are carried as part of
encapsulations where the IOAM data follows a header that uses an
EtherType to denote the next protocol in the packet. Examples of
these protocols are GRE [RFC2784] and Geneve [I-D.ietf-nvo3-geneve]).
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This document outlines how IOAM data fields are encoded in these
protocols.
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
Geneve: Generic Network Virtualization Encapsulation
GRE: Generic Routing Encapsulation
IOAM: In-situ Operations, Administration, and Maintenance
OAM: Operations, Administration, and Maintenance
POT: Proof of Transit
3. IOAM Ethertype
When the IOAM data fields are included within an encapsulation that
identifies the next protocol using an EtherType (e.g., GRE or Geneve)
the presence of IOAM data fields are identified with TBD_IOAM. When
the Ethernet Encapsulation for In-situ OAM Data is used, an
additional IOAM header is also included. This header indicates the
type of IOAM data that follows, and the next protocol that follows
the IOAM data.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IOAM-Type | IOAM HDR len| Next Protocol |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! |
! |
~ IOAM Option and Data Space ~
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The IOAM encapsulation 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 IOAM Option and Data
Space. For example, if two IOAM options are included, the Next
Protocol field of the first IOAM option will contain the value of
TBD_IOAM, while the Next Protocol field of the second IOAM option
will contain the Ethertype or IP protocol Number indicating the type
of the data packet.
4. Usage Examples of the IOAM Ethertype
The Ethernet Encapsulation for In-situ OAM Data can be used with many
encapsulations. The following sections show how it can be used with
GRE and Geneve.
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4.1. Example: GRE Encapsulation of In-situ OAM Date Fields
When IOAM data fields are carried in GRE, the IOAM encapsulation
defined above follows the GRE header, as shown in Figure 1.
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/...) |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: GRE Encapsulation Example
The GRE header and fields are defined in [RFC2784]. The GRE Protocol
Type value is TBD_IOAM.
4.2. Example: Geneve Encapsulation of IOAM Data Fields
When IOAM data fields are carried in Geneve, the IOAM encapsulation
defined above follows the Geneve header, as shown in Figure 2.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
|Ver| Opt Len |O|C| Rsvd. | Protocol Type = <TBD_IOAM> | |G
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |E
| Virtual Network Identifier (VNI) | Reserved | |N
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |E
| Variable Length Options | |V
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+E
| IOAM-Type | IOAM HDR len| Next Protocol | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ I
! | O
! | A
~ IOAM Option and Data Space ~ M
| | |
| | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
| |
| Inner header + Payload + Padding (L2/L3/ESP/...) |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: Geneve Encapsulation Example
The GENEVE header and fields are defined in [I-D.ietf-nvo3-geneve].
The Geneve Protocol Type value is TBD_IOAM.
5. 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.
6. IANA Considerations
A new EtherType value is requested to be added to the [ETYPES] IANA
registry. The description should be "In-situ OAM (IOAM)".
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7. References
7.1. 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., daniel.bernier@bell.ca, d., and J. Lemon,
"Data Fields for In-situ OAM", draft-ietf-ippm-ioam-
data-03 (work in progress), June 2018.
[I-D.ietf-nvo3-geneve]
Gross, J., Ganga, I., and T. Sridhar, "Geneve: Generic
Network Virtualization Encapsulation", draft-ietf-
nvo3-geneve-08 (work in progress), October 2018.
[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>.
[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>.
7.2. 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>.
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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
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
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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
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
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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
Mickey Spiegel
Barefoot Networks
2185 Park Boulevard
Palo Alto, CA 94306
US
Email: mspiegel@barefootnetworks.com
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