Network Working Group G. Mirsky
Internet-Draft ZTE Corp.
Intended status: Standards Track G. Jun
Expires: October 25, 2019 ZTE Corporation
H. Nydell
Accedian Networks
R. Foote
Nokia
April 23, 2019
Simple Two-way Active Measurement Protocol
draft-ietf-ippm-stamp-06
Abstract
This document describes a Simple Two-way Active Measurement Protocol
which enables the measurement of both one-way and round-trip
performance metrics like delay, delay variation, and packet loss.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on October 25, 2019.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions used in this document . . . . . . . . . . . . . . 3
2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Requirements Language . . . . . . . . . . . . . . . . . . 3
3. Softwarization of Performance Measurement . . . . . . . . . . 3
4. Theory of Operation . . . . . . . . . . . . . . . . . . . . . 4
4.1. Session-Sender Behavior and Packet Format . . . . . . . . 4
4.1.1. Session-Sender Packet Format in Unauthenticated Mode 4
4.1.2. Session-Sender Packet Format in Authenticated Mode . 6
4.2. Session-Reflector Behavior and Packet Format . . . . . . 7
4.2.1. Session-Reflector Packet Format in Unauthenticated
Mode . . . . . . . . . . . . . . . . . . . . . . . . 8
4.2.2. Session-Reflector Packet Format in Authenticated Mode 9
4.3. Integrity and Confidentiality Protection in STAMP . . . . 11
4.4. Interoperability with TWAMP Light . . . . . . . . . . . . 11
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
6. Security Considerations . . . . . . . . . . . . . . . . . . . 12
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 12
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
8.1. Normative References . . . . . . . . . . . . . . . . . . 12
8.2. Informative References . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14
1. Introduction
Development and deployment of Two-Way Active Measurement Protocol
(TWAMP) [RFC5357] and its extensions, e.g., [RFC6038] that defined
features such as Reflect Octets and Symmetrical Size for TWAMP
provided invaluable experience. Several independent implementations
exist, have been deployed and provide important operational
performance measurements. At the same time, there has been
noticeable interest in using a simpler mechanism for active
performance monitoring that can provide deterministic behavior and
inherit separation of control (vendor-specific configuration or
orchestration) and test functions. One of such is Performance
Measurement from IP Edge to Customer Equipment using TWAMP Light from
Broadband Forum [BBF.TR-390] used as the reference TWAMP Light that,
according to [RFC8545], includes sub-set of TWAMP-Test functions in
combination with other applications that provide, for example,
control and security. This document defines active performance
measurement test protocol, Simple Two-way Active Measurement Protocol
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(STAMP), that enables measurement of both one-way and round-trip
performance metrics like delay, delay variation, and packet loss.
2. Conventions used in this document
2.1. Terminology
AES Advanced Encryption Standard
CBC Cipher Block Chaining
ECB Electronic Cookbook
KEK Key-encryption Key
STAMP - Simple Two-way Active Measurement Protocol
NTP - Network Time Protocol
PTP - Precision Time Protocol
HMAC Hashed Message Authentication Code
OWAMP One-Way Active Measurement Protocol
TWAMP Two-Way Active Measurement Protocol
2.2. 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 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
3. Softwarization of Performance Measurement
Figure 1 presents the Simple Two-way Active Measurement Protocol
(STAMP) Session-Sender and Session-Reflector with a measurement
session. The configuration and management of the STAMP Session-
Sender, Session-Reflector and management of the STAMP sessions can be
achieved through various means. Command Line Interface, OSS/BSS
(operations support system/business support system as a combination
of two systems used to support a range of telecommunication services)
using SNMP or controllers in Software-Defined Networking using
Netconf/YANG are but a few examples.
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o----------------------------------------------------------o
| Configuration and |
| Management |
o----------------------------------------------------------o
|| ||
|| ||
|| ||
+----------------------+ +-------------------------+
| STAMP Session-Sender | <--- STAMP---> | STAMP Session-Reflector |
+----------------------+ +-------------------------+
Figure 1: STAMP Reference Model
4. Theory of Operation
STAMP Session-Sender transmits test packets toward STAMP Session-
Reflector. STAMP Session-Reflector receives Session-Sender's packet
and acts according to the configuration and optional control
information communicated in the Session-Sender's test packet. STAMP
defines two different test packet formats, one for packets
transmitted by the STAMP-Session-Sender and one for packets
transmitted by the STAMP-Session-Reflector. STAMP supports two
modes: unauthenticated and authenticated. Unauthenticated STAMP test
packets, defined in Section 4.1.1 and Section 4.2.1, ensure
interworking between STAMP and TWAMP Light as described in
Section 4.4 packet formats.
By default, STAMP uses symmetrical packets, i.e., size of the packet
transmitted by Session-Reflector equals the size of the packet
received by the Session-Reflector.
4.1. Session-Sender Behavior and Packet Format
Because STAMP supports symmetrical test packets, STAMP Session-Sender
packet has a minimum size of 44 octets in unauthenticated mode, see
Figure 2, and 112 octets in the authenticated mode, see Figure 4.
4.1.1. Session-Sender Packet Format in Unauthenticated Mode
STAMP Session-Sender packet format in unauthenticated mode:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Timestamp |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Error Estimate | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
| |
| |
| MBZ (27 octets) |
| |
| |
| |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | Server Octets | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
| Remaining Packet Padding (to be reflected) |
~ (length in octets specified in Server Octets) ~
+ +-+-+-+-+-+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: STAMP Session-Sender test packet format in unauthenticated
mode
where fields are defined as the following:
o Sequence Number is four octets long field. For each new session
its value starts at zero and is incremented with each transmitted
packet.
o Timestamp is eight octets long field. STAMP node MUST support
Network Time Protocol (NTP) version 4 64-bit timestamp format
[RFC5905], the format used in [RFC5357]. STAMP node MAY support
IEEE 1588v2 Precision Time Protocol truncated 64-bit timestamp
format [IEEE.1588.2008], the format used in [RFC8186].
o Error Estimate is two octets long field with format displayed in
Figure 3
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0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S|Z| Scale | Multiplier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 3: Error Estimate Format
where S, Scale, and Multiplier fields are interpreted as they have
been defined in section 4.1.2 [RFC4656]; and Z field - as has been
defined in section 2.3 [RFC8186]:
* 0 - NTP 64 bit format of a timestamp;
* 1 - PTPv2 truncated format of a timestamp.
The STAMP Session-Sender and Session-Reflector MAY use, not use,
or set value of the Z field in accordance with the timestamp
format in use. This optional field is to enhance operations, but
local configuration or defaults could be used in its place.
o Must-be-Zero (MBZ) field in the session-sender unauthenticated
packet is 27 octets long. It MUST be all zeroed on the
transmission and ignored on receipt.
o Server Octets field is optional two octets long field. This field
is used for the Reflect Octets capability defined in [RFC6038].
If being used, the Server Octets field MUST follow the 27 octets
long MBZ field. The value in the Server Octets field equals the
number of octets the Session-Reflector is expected to copy back to
the Session-Sender starting with the Server Octets field. Thus
the minimum non-zero value for the Server Octets field is two.
Therefore, the value of one is invalid. If none of Payload to be
copied, the value of the Server Octets field MUST be set to zero
on transmit.
o Remaining Packet Padding is an optional field of variable length.
The number of octets in the Remaining Packet Padding field is the
value of the Server Octets field minus the length of the Server
Octets field.
4.1.2. Session-Sender Packet Format in Authenticated Mode
STAMP Session-Sender packet format in authenticated mode:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| MBZ (12 octets) |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Timestamp |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Error Estimate | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
~ ~
| MBZ (70 octets) |
~ ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| HMAC (16 octets) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 4: STAMP Session-Sender test packet format in authenticated
mode
The field definitions are the same as the unauthenticated mode,
listed in Section 4.1.1. Also, Comp.MBZ field is a variable length
field to align the packet on 16 octets boundary. Also, the packet
includes a key-hashed message authentication code (HMAC) ([RFC2104])
hash at the end of the PDU. The detailed use of the HMAC field is
described in Section 4.3.
4.2. Session-Reflector Behavior and Packet Format
The Session-Reflector receives the STAMP test packet, verifies it,
prepares and transmits the reflected test packet.
Two modes of STAMP Session-Reflector characterize the expected
behavior and, consequently, performance metrics that can be measured:
o Stateless - STAMP Session-Reflector does not maintain test state
and will reflect the received sequence number without
modification. As a result, only round-trip packet loss can be
calculated while the reflector is operating in stateless mode.
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o Stateful - STAMP Session-Reflector maintains test state thus
enabling the ability to determine forward loss, gaps recognized in
the received sequence number. As a result, both near-end
(forward) and far-end (backward) packet loss can be computed.
That implies that the STAMP Session-Reflector MUST keep a state
for each accepted STAMP-test session, uniquely identifying STAMP-
test packets to one such session instance, and enabling adding a
sequence number in the test reply that is individually incremented
on a per-session basis.
4.2.1. Session-Reflector Packet Format in Unauthenticated Mode
For unauthenticated mode:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Timestamp |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Error Estimate | MBZ |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Receive Timestamp |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Session-Sender Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Session-Sender Timestamp |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Session-Sender Error Estimate | MBZ |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Ses-Sender TTL | |
+-+-+-+-+-+-+-+-+ +
| |
~ Packet Padding (reflected) ~
+ +-+-+-+-+-+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 5: STAMP Session-Reflector test packet format in
unauthenticated mode
where fields are defined as the following:
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o Sequence Number is four octets long field. The value of the
Sequence Number field is set according to the mode of the STAMP
Session-Reflector:
* in the stateless mode the Session-Reflector copies the value
from the received STAMP test packet's Sequence Number field;
* in the stateful mode the Session-Reflector counts the received
STAMP test packets in each test session and uses that counter
to set the value of the Sequence Number field.
o Timestamp and Receiver Timestamp fields are each eight octets
long. The format of these fields, NTP or PTPv2, indicated by the
Z flag of the Error Estimate field as described in Section 4.1.
o Error Estimate has the same size and interpretation as described
in Section 4.1.
o Session-Sender Sequence Number, Session-Sender Timestamp, and
Session-Sender Error Estimate are copies of the corresponding
fields in the STAMP test packet sent by the Session-Sender.
o Session-Sender TTL is one octet long field, and its value is the
copy of the TTL field in IPv4 (or Hop Limit in IPv6) from the
received STAMP test packet.
o Packet Padding (reflected) is an optional variable length field.
The length of the Packet Padding (reflected) field MUST be equal
to the value of the Server Octets field (Figure 2). If the value
is non-zero, the Session-Reflector MUST copy number of octets
equal to the value of Server Octets field starting with the Server
Octets field.
o Comp.MBZ is a variable length field used to achieve alignment on a
word boundary. Thus the length of Comp.MBZ field may be only 0,
1, 2 or 3 octets. The value of the field MUST be zeroed on
transmission and ignored on receipt.
4.2.2. Session-Reflector Packet Format in Authenticated Mode
For the authenticated mode:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MBZ (12 octets) |
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| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Timestamp |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Error Estimate | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
| MBZ (6 octets) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Receive Timestamp |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MBZ (8 octets) |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Session-Sender Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MBZ (12 octets) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Session-Sender Timestamp |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Session-Sender Error Estimate | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
| MBZ (6 octets) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Ses-Sender TTL | |
+-+-+-+-+-+-+-+-+ +
| |
| MBZ (15 octets) |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| HMAC (16 octets) |
| |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 6: STAMP Session-Reflector test packet format in authenticated
mode
The field definitions are the same as the unauthenticated mode,
listed in Section 4.2.1. Additionally, the packet MAY include
Comp.MBZ field is a variable length field to align the packet on 16
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octets boundary. Also, STAMP Session-Reflector test packet format in
authenticated mode includes a key (HMAC) ([RFC2104]) hash at the end
of the PDU. The detailed use of the HMAC field is in Section 4.3.
4.3. Integrity and Confidentiality Protection in STAMP
To provide integrity protection, each STAMP message is being
authenticated by adding Hashed Message Authentication Code (HMAC).
STAMP uses HMAC-SHA-256 truncated to 128 bits (similarly to the use
of it in IPSec defined in [RFC4868]); hence the length of the HMAC
field is 16 octets. HMAC uses own key and the definition of the
mechanism to distribute the HMAC key is outside the scope of this
specification. One example is to use an orchestrator to configure
HMAC key based on STAMP YANG data model [I-D.ietf-ippm-stamp-yang].
HMAC MUST be verified as early as possible to avoid using or
propagating corrupted data.
If confidentiality protection for STAMP is required, encryption at
the higher level MUST be used. For example, STAMP packets could be
transmitted in the dedicated IPsec tunnel or share the IPsec tunnel
with the monitored flow.
4.4. Interoperability with TWAMP Light
One of the essential requirements to STAMP is the ability to
interwork with a TWAMP Light device. There are two possible
combinations for such use case:
o STAMP Session-Sender with TWAMP Light Session-Reflector;
o TWAMP Light Session-Sender with STAMP Session-Reflector.
In the former case, the Session-Sender MAY not be aware that its
Session-Reflector does not support STAMP. For example, a TWAMP Light
Session-Reflector may not support the use of UDP port 862 as defined
in [RFC8545]. Thus STAMP Session-Sender MUST be able to send test
packets to destination UDP port number from the Dynamic and/or
Private Ports range 49152-65535, test management system should find a
port number that both devices can use. And if any of STAMP
extensions are used, the TWAMP Light Session-Reflector will view them
as Packet Padding field. The Session-Sender SHOULD use the default
format for its timestamps - NTP. And it MAY use PTPv2 timestamp
format.
In the latter scenario, the test management system should set STAMP
Session-Reflector to use UDP port number from the Dynamic and/or
Private Ports range. As for Packet Padding field that the TWAMP
Light Session-Sender includes in its transmitted packet, the STAMP
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Session-Reflector will process it according to [RFC6038] and return
reflected packet of the symmetrical size. The Session-Reflector MUST
use the default format for its timestamps - NTP.
5. IANA Considerations
This document doesn't have any IANA action. This section may be
removed before the publication.
6. Security Considerations
In general, all the security considerations related to TWAMP-Test,
discussed in [RFC5357] apply to STAMP. Since STAMP uses the well-
known UDP port number allocated for the OWAMP-Test/TWAMP-Test
Receiver port, the security considerations and measures to mitigate
the risk of the attack using the registered port number documented in
Section 6 [RFC8545] equally apply to STAMP. Because of the control
and management of a STAMP test being outside the scope of this
specification only the more general requirement is set:
To mitigate the possible attack vector, the control and management
of a STAMP test session MUST use the secured transport.
Use of HMAC-SHA-256 in the authenticated mode protects the data
integrity of the STAMP test packets.
7. Acknowledgments
Authors express their appreciation to Jose Ignacio Alvarez-Hamelin
and Brian Weis for their great insights into the security and
identity protection, and the most helpful and practical suggestions.
Also, our sincere thanks to David Ball for his thorough review and
helpful comments.
8. References
8.1. Normative References
[IEEE.1588.2008]
"Standard for a Precision Clock Synchronization Protocol
for Networked Measurement and Control Systems",
IEEE Standard 1588, March 2008.
[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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[RFC4656] Shalunov, S., Teitelbaum, B., Karp, A., Boote, J., and M.
Zekauskas, "A One-way Active Measurement Protocol
(OWAMP)", RFC 4656, DOI 10.17487/RFC4656, September 2006,
<https://www.rfc-editor.org/info/rfc4656>.
[RFC5357] Hedayat, K., Krzanowski, R., Morton, A., Yum, K., and J.
Babiarz, "A Two-Way Active Measurement Protocol (TWAMP)",
RFC 5357, DOI 10.17487/RFC5357, October 2008,
<https://www.rfc-editor.org/info/rfc5357>.
[RFC5905] Mills, D., Martin, J., Ed., Burbank, J., and W. Kasch,
"Network Time Protocol Version 4: Protocol and Algorithms
Specification", RFC 5905, DOI 10.17487/RFC5905, June 2010,
<https://www.rfc-editor.org/info/rfc5905>.
[RFC6038] Morton, A. and L. Ciavattone, "Two-Way Active Measurement
Protocol (TWAMP) Reflect Octets and Symmetrical Size
Features", RFC 6038, DOI 10.17487/RFC6038, October 2010,
<https://www.rfc-editor.org/info/rfc6038>.
[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>.
[RFC8186] Mirsky, G. and I. Meilik, "Support of the IEEE 1588
Timestamp Format in a Two-Way Active Measurement Protocol
(TWAMP)", RFC 8186, DOI 10.17487/RFC8186, June 2017,
<https://www.rfc-editor.org/info/rfc8186>.
[RFC8545] Morton, A., Ed. and G. Mirsky, Ed., "Well-Known Port
Assignments for the One-Way Active Measurement Protocol
(OWAMP) and the Two-Way Active Measurement Protocol
(TWAMP)", RFC 8545, DOI 10.17487/RFC8545, March 2019,
<https://www.rfc-editor.org/info/rfc8545>.
8.2. Informative References
[BBF.TR-390]
"Performance Measurement from IP Edge to Customer
Equipment using TWAMP Light", BBF TR-390, May 2017.
[I-D.ietf-ippm-stamp-yang]
Mirsky, G., Xiao, M., and W. Luo, "Simple Two-way Active
Measurement Protocol (STAMP) Data Model", draft-ietf-ippm-
stamp-yang-03 (work in progress), March 2019.
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[RFC2104] Krawczyk, H., Bellare, M., and R. Canetti, "HMAC: Keyed-
Hashing for Message Authentication", RFC 2104,
DOI 10.17487/RFC2104, February 1997,
<https://www.rfc-editor.org/info/rfc2104>.
[RFC4868] Kelly, S. and S. Frankel, "Using HMAC-SHA-256, HMAC-SHA-
384, and HMAC-SHA-512 with IPsec", RFC 4868,
DOI 10.17487/RFC4868, May 2007,
<https://www.rfc-editor.org/info/rfc4868>.
Authors' Addresses
Greg Mirsky
ZTE Corp.
Email: gregimirsky@gmail.com
Guo Jun
ZTE Corporation
68# Zijinghua Road
Nanjing, Jiangsu 210012
P.R.China
Phone: +86 18105183663
Email: guo.jun2@zte.com.cn
Henrik Nydell
Accedian Networks
Email: hnydell@accedian.com
Richard Foote
Nokia
Email: footer.foote@nokia.com
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