Internet DRAFT - draft-ietf-ippm-otwamp-on-lag
draft-ietf-ippm-otwamp-on-lag
IPPM Z. Li
Internet-Draft China Mobile
Intended status: Standards Track T. Zhou
Expires: 13 June 2024 Huawei
J. Guo
ZTE Corp.
G. Mirsky
Ericsson
R. Gandhi
Cisco
11 December 2023
One-way/Two-way Active Measurement Protocol Extensions for Performance
Measurement on LAG
draft-ietf-ippm-otwamp-on-lag-08
Abstract
This document defines extensions to One-way Active Measurement
Protocol (OWAMP), and Two-way Active Measurement Protocol (TWAMP) to
implement performance measurement on every member link of a Link
Aggregation Group (LAG). Knowing the measured metrics of each member
link of a LAG enables operators to enforce the performance based
traffic steering policy across the member links.
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.
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
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
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This Internet-Draft will expire on 13 June 2024.
Copyright Notice
Copyright (c) 2023 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/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document. Code Components
extracted from this document must include Revised BSD License text as
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provided without warranty as described in the Revised BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Micro Session on LAG . . . . . . . . . . . . . . . . . . . . 3
3. Micro OWAMP Session . . . . . . . . . . . . . . . . . . . . . 4
3.1. Micro OWAMP-Control . . . . . . . . . . . . . . . . . . . 4
3.2. Micro OWAMP-Test . . . . . . . . . . . . . . . . . . . . 4
4. Micro TWAMP Session . . . . . . . . . . . . . . . . . . . . . 5
4.1. Micro TWAMP-Control . . . . . . . . . . . . . . . . . . . 5
4.2. Micro TWAMP-Test . . . . . . . . . . . . . . . . . . . . 5
4.2.1. Sender Packet Format and Content . . . . . . . . . . 5
4.2.2. Sender Behavior . . . . . . . . . . . . . . . . . . . 7
4.2.3. Reflector Packet Format and Content . . . . . . . . . 8
4.2.4. Reflector Behavior . . . . . . . . . . . . . . . . . 11
5. Applicability . . . . . . . . . . . . . . . . . . . . . . . . 11
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
6.1. Micro OWAMP-Control Command . . . . . . . . . . . . . . . 12
6.2. Micro TWAMP-Control Command . . . . . . . . . . . . . . . 12
7. Security Considerations . . . . . . . . . . . . . . . . . . . 12
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 12
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
9.1. Normative References . . . . . . . . . . . . . . . . . . 12
9.2. Informative References . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 13
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1. Introduction
Link Aggregation Group (LAG), as defined in [IEEE802.1AX], provides
mechanisms to combine multiple physical links into a single logical
link. This logical link offers higher bandwidth and better
resiliency, because if one of the physical member links fails, the
aggregate logical link can continue to forward traffic over the
remaining operational physical member links.
Usually, when forwarding traffic over LAG, a hash-based mechanism is
used to load balance the traffic across the LAG member links. The
link delay might vary between member links because of different
transport paths, especially when LAG is used in wide area network.
To provide low latency service for time sensitive traffic, we need to
explicitly steer the traffic across the LAG member links based on the
link delay, loss and so on. That requires a solution to measure the
performance metrics of every member link of a LAG. Hence, the
measured performance metrics can work together with layer 2 bundle
member link attributes advertisement [RFC8668] for traffic steering.
According to the classifications in [RFC7799], OWAMP [RFC4656] and
TWAMP [RFC5357] are active measurement methods, and they can
complement passive and hybrid methods. With either method, one test
session over the LAG can measure the performance of a member link
with fixed five tuples. Or it can measure an average of some/all
member links of the LAG by varying the five tuples. However, without
the knowledge of each member link, a test session cannot measure the
performance of every physical member link.
This document extends OWAMP and TWAMP to implement performance
measurement on every member link of a LAG. It can provide the same
metrics as OWAMP and TWAMP can measure, such as delay, jitter and
packet loss.
2. Micro Session on LAG
This document addresses the scenario where a LAG directly connects
two nodes. An example of this is in Figure 1, where the LAG
consisting of four links connects nodes A and B. The goal is to
measure the performance of each link of the LAG.
+---+ +---+
| |-----------------------| |
| A |-----------------------| B |
| |-----------------------| |
| |-----------------------| |
+---+ +---+
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Figure 1: Performance Measurement on LAG
To measure the performance metrics of every member link of a LAG,
multiple sessions (one session for each member link) need to be
established between the two end points that are connected by the LAG.
These sessions are called micro sessions in the remainder of this
document. Although micro sessions are in fact OWAMP or TWAMP
sessions established on member links of a LAG, test packets of micro
TWAMP sessions MUST carry member link information for validation.
All micro sessions of a LAG share the same Sender IP Address and
Receiver IP Address of the LAG. As for the UDP layer, the micro
sessions may share the same Sender Port and Receiver Port pair, or
each micro session is configured with a different Sender Port and
Receiver Port pair. But from the operational point of view, the
former is simpler and is RECOMMENDED.
Test packets of a micro session MUST carry the member link
information for validation check. For example, when a micro TWAMP
Session-Sender receives a reflected test packet, it checks whether
the test packet is from the expected member link.
3. Micro OWAMP Session
3.1. Micro OWAMP-Control
To support the micro OWAMP session, a new command, Request-OW-Micro-
Sessions (TBD1), is defined in this document. The Request-OW-Micro-
Sessions command is based on the OWAMP Request-Session command, and
uses the message format as described in Section 3.5 of OWAMP
[RFC4656]. Test session creation of micro OWAMP session follows the
same procedure as defined in Section 3.5 of OWAMP [RFC4656] with the
following additions:
When an OWAMP Server receives a Request-OW-Micro-Sessions command, if
the request is accepted, the OWAMP Server MUST build a set of micro
sessions for all the member links of the LAG from which the Request-
OW-Micro-Sessions message is received.
3.2. Micro OWAMP-Test
Micro OWAMP-Test reuses the OWAMP-Test packet format and procedures
as defined in Section 4 of OWAMP [RFC4656] with the following
additions:
The micro OWAMP Session-Sender MUST send the micro OWAMP-Test packets
over the member link with which the session is associated. When it
receives a test packet, the micro OWAMP Session-Receiver MUST use the
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member link from which the test packet is received to correlate the
micro OWAMP session. If there is no such a session, the Test packet
MUST be discarded.
4. Micro TWAMP Session
4.1. Micro TWAMP-Control
To support the micro TWAMP session, a new command, Request-TW-Micro-
Sessions (TBD2), is defined in this document. The Request-TW-Micro-
Sessions command is based on the TWAMP Request-Session command, and
uses the message format as described in Section 3.5 of TWAMP
[RFC5357]. Test session creation of micro TWAMP session follows the
same procedure as defined in Section 3.5 of TWAMP [RFC5357] with the
following additions:
When a TWAMP Server receives a Request-TW-Micro-Sessions command, if
the request is accepted, the TWAMP Server MUST build a set of micro
sessions for all the member links of the LAG from which the Request-
TW-Micro-Sessions message is received.
4.2. Micro TWAMP-Test
The micro TWAMP-Test protocol is based on the TWAMP-Test protocol
[RFC5357] with the following extensions.
4.2.1. Sender Packet Format and Content
The micro TWAMP Session-Sender packet format is based on the TWAMP
Session-Sender packet format as defined in Section 4.1.2 of
[RFC5357]. Two new fields (Sender Micro-session ID and Reflector
Micro-session ID) are added to carry the LAG member link identifiers.
For unauthenticated mode, the format is as below:
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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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sender Micro-session ID | Reflector Micro-session ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
. Packet Padding .
. .
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: Micro Session-Sender Packet Format in Unauthenticated Mode
For authenticated mode, the format is as below:
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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sender Micro-session ID | Reflector Micro-session ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| HMAC (16 octets) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
. Packet Padding .
. .
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Figure 3: Micro Session-Sender Packet Format in Authenticated Mode
Except for the Sender/Reflector Micro-session ID field, all the other
fields are the same as defined in Section 4.1.2 of TWAMP [RFC5357],
which is defined in Section 4.1.2 of OWAMP [RFC4656]. Therefore, it
follows the same procedure and guidelines as defined in Section 4.1.2
of TWAMP [RFC5357].
* Sender Micro-session ID (2-octets in length): It is now defined to
carry the LAG member link identifier of the Sender side. In the
future, it may be used generically to cover use-cases beyond LAG.
The value of this field MUST be unique within a TWAMP session at
the Session-Sender.
* Reflector Micro-session ID (2-octets in length): It is now defined
to carry the LAG member link identifier of the Reflector side. In
the future, it may be used generically to cover use-cases beyond
LAG. The value of this field MUST be unique within a TWAMP
session at the Session-Reflector.
4.2.2. Sender Behavior
The micro TWAMP Session-Sender inherits the behaviors of the TWAMP
Session-Sender as defined in Section 4.1 of [RFC5357]. In addition,
the micro TWAMP Session-Sender MUST send the micro Session-Sender
test packets over the member link with which the session is
associated.
When sending the test packet, the micro TWAMP Session-Sender MUST put
the Sender member link identifier that is associated with the micro
TWAMP session in the Sender Micro-session ID. If the Session-Sender
knows the Reflector member link identifier, the Reflector Micro-
session ID field (see Figure 2 and Figure 3) MUST be set. Otherwise,
the Reflector Micro-session ID field MUST be zero.
A test packet with Sender member link identifier is sent to the
Session-Reflector, and then is reflected with the same Sender member
link identifier. So the Session-Sender can use the Sender member
link identifier to check whether a reflected test packet is received
from the member link associated with the correct micro TWAMP session.
The Reflector member link identifier carried in the Reflector Micro-
session ID field is used by the Session-Reflector to check whether a
test packet is received from the member link associated with the
correct micro TWAMP session. It means that the Session-Sender has to
learn the Reflector member link identifier. Once the Session-Sender
knows the Reflector member link identifier, it MUST put the
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identifier in the Reflector Micro-session ID field (see Figure 2 or
Figure 3) of the test packets that will be sent to the Session-
Reflector. The Reflector member link identifier can be obtained from
pre-configuration or learned from the data plane (e.g., the reflected
test packet). This document does not specify the way to obtain the
Reflector member link identifier.
When receiving a reflected test packet, the micro TWAMP Session-
Sender MUST use the receiving member link to correlate the reflected
test packet to a micro TWAMP session. If there is no such a session,
the reflected test packet MUST be discarded. If a matched session
exists, the micro Session-Sender MUST use the Sender Micro-session ID
to validate whether the reflected test packet is correctly received
from the expected member link. If the validation fails, the test
packet MUST be discarded. The micro Session-Sender MUST use the
Reflector Micro-session ID to validate the Reflector's behavior. If
the validation fails, the test packet MUST be discarded.
4.2.3. Reflector Packet Format and Content
The micro TWAMP Session-Reflector packet format is based on the TWAMP
Session-Reflector packet format as defined in Section 4.2.1 of
[RFC5357]. Two new fields (Sender and Reflector Micro-session ID)
are added to carry the LAG member link identifiers.
For unauthenticated mode, the format is as below:
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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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Receive Timestamp |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sender Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sender Timestamp |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sender Error Estimate | Sender Micro-session ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sender TTL | MBZ | Reflector Micro-session ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
. .
. Packet Padding .
. .
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 4: Micro Session-Reflector Packet Format in
Unauthenticated Mode
For authenticated mode, the format is as below:
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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Sender Micro-session ID | Reflector Micro-session ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Receive Timestamp |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MBZ (8 octets) |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sender Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MBZ (12 octets) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sender Timestamp |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sender Error Estimate | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
| MBZ (6 octets) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sender TTL | |
+-+-+-+-+-+-+-+-+ +
| |
| |
| MBZ (15 octets) |
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
| HMAC (16 octets) |
| |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
. Packet Padding .
. .
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 5: Micro Session-Reflector Packet Format in Authenticated Mode
Except for the Sender/Reflector Micro-session ID field, all the other
fields are the same as defined in Section 4.2.1 of TWAMP [RFC5357].
Therefore, it follows the same procedure and guidelines as defined in
Section 4.2.1 of TWAMP [RFC5357].
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* Sender Micro-session ID (2-octets in length): It is now defined to
carry the LAG member link identifier of the Sender side. In the
future, it may be used generically to cover use-cases beyond LAG.
The value of this field MUST be unique within a TWAMP session at
the Session-Sender.
* Reflector Micro-session ID (2-octets in length): It is now defined
to carry the LAG member link identifier of the Reflector side. In
the future, it may be used generically to cover use-cases beyond
LAG. The value of this field MUST be unique within a TWAMP
session at the Session-Reflector.
4.2.4. Reflector Behavior
The micro TWAMP Session-Reflector inherits the behaviors of a TWAMP
Session-Reflector as defined in Section 4.2 of [RFC5357].
In addition, when receiving a test packet, the micro TWAMP Session-
Reflector MUST use the receiving member link to correlate the test
packet to a micro TWAMP session. If there is no such a session, the
test packet MUST be discarded. If the Reflector Micro-session ID is
not zero, the Reflector MUST use the Reflector Micro-session ID to
validate whether it associates with the receiving member link. If
the Reflector Micro-session ID is zero, it will not be verified. If
the validation fails, the test packet MUST be discarded.
When sending a response to the received test packet, the micro TWAMP
Session-Reflector MUST copy the Sender member link identifier from
the received test packet and put it in the Sender Micro-session ID
field of the reflected test packet (see Figure 4 and Figure 5). In
addition, the micro TWAMP Session-Reflector MUST fill the Reflector
Micro-session ID field (see Figure 4 and Figure 5) of the reflected
test packet with the member link identifier that is associated with
the micro TWAMP session.
5. Applicability
To set up the micro OWAMP sessions, the Control-Client firstly sends
the Request-OW-Micro-Sessions command to the OWAMP Server. The OWAMP
Server accepts the request, and builds a set of micro sessions for
all the member links of the LAG.
For micro TWAMP sessions, the similar set up procedure as micro OWAMP
sessions is used. Then the micro TWAMP Session-Sender sends micro
Session-Sender packets with the Sender Micro-session ID and the
Reflector Micro-session ID. The micro Session-Reflector checks
whether a test packet is received from the member link associated
with the correct micro TWAMP session, if the Reflector Micro-session
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ID field is set. When reflecting, the micro TWAMP Session-Reflector
copies the Sender Micro-session ID from the received micro Session-
Sender packet to the micro Session-Reflector packet, and sets the
Reflector Micro-session ID field with the member link identifier that
is associated with the micro TWAMP session. When receiving the micro
TWAMP Session-Reflector packet, the micro Session-Sender uses the
Sender Micro-session ID to check whether the packet is received from
the member link associated with the correct micro TWAMP session. The
micro Session-Sender also uses the Reflector Micro-session ID to
validate the Reflector's behavior.
6. IANA Considerations
6.1. Micro OWAMP-Control Command
This document requires the IANA to allocate the following command
type from OWAMP-Control Command Number Registry.
Value Description Semantics Definition
TBD1 Request-OW-Micro-Sessions This document, Section 3.1
6.2. Micro TWAMP-Control Command
This document requires the IANA to allocate the following command
type from TWAMP-Control Command Number Registry.
Value Description Semantics Definition
TBD2 Request-TW-Micro-Sessions This document, Section 4.1
7. Security Considerations
This document does not introduce additional security requirements and
mechanisms other than those described in [RFC4656], and [RFC5357].
8. Acknowledgements
The authors would like to thank Fang Xin, Henrik Nydell, Mach Chen,
Min Xiao, Jeff Tantsura, Marcus Ihlar, Richard Foote for the valuable
comments to this work.
9. References
9.1. Normative References
[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>.
[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>.
[RFC8668] Ginsberg, L., Ed., Bashandy, A., Filsfils, C., Nanduri,
M., and E. Aries, "Advertising Layer 2 Bundle Member Link
Attributes in IS-IS", RFC 8668, DOI 10.17487/RFC8668,
December 2019, <https://www.rfc-editor.org/info/rfc8668>.
9.2. Informative References
[IEEE802.1AX]
IEEE Std. 802.1AX, "IEEE Standard for Local and
metropolitan area networks - Link Aggregation", November
2008.
[RFC7799] Morton, A., "Active and Passive Metrics and Methods (with
Hybrid Types In-Between)", RFC 7799, DOI 10.17487/RFC7799,
May 2016, <https://www.rfc-editor.org/info/rfc7799>.
[RFC9256] Filsfils, C., Talaulikar, K., Ed., Voyer, D., Bogdanov,
A., and P. Mattes, "Segment Routing Policy Architecture",
RFC 9256, DOI 10.17487/RFC9256, July 2022,
<https://www.rfc-editor.org/info/rfc9256>.
Authors' Addresses
Zhenqiang Li
China Mobile
No. 29 Finance Avenue, Xicheng District
Beijing
China
Email: li_zhenqiang@hotmail.com
Tianran Zhou
Huawei
China
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Email: zhoutianran@huawei.com
Jun Guo
ZTE Corp.
China
Email: guo.jun2@zte.com.cn
Greg Mirsky
Ericsson
United States of America
Email: gregimirsky@gmail.com
Rakesh Gandhi
Cisco
Canada
Email: rgandhi@cisco.com
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