IPPM H. Wang
Internet-Draft Y. Liu
Intended status: Standards Track China Mobile
Expires: March 3, 2023 C. Lin
New H3C Technologies
X. Min
ZTE Corporation
August 30, 2022
Flow Measurement in IPv6 Network
draft-wang-ippm-ipv6-flow-measurement-02
Abstract
In-situ Operations, Administration, and Maintenance (OAM) need
carrying the necessary measurement information into a packet while
the packet transverses a path between two points in the network.
This document describes how to deploy in-situ flow performance
measurement based on Alternate-Marking method in IPv6 domain.
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
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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."
This Internet-Draft will expire on March 3, 2023.
Copyright Notice
Copyright (c) 2021 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
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to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Flow Measurement in IPv6 Network . . . . . . . . . . . . . . 3
2.1. Carrying Flow Measurement Data . . . . . . . . . . . . . 3
2.2. Flow Measurement Data Definition . . . . . . . . . . . . 4
3. Definition of Flow Monitor Option . . . . . . . . . . . . . . 4
3.1. Data Fields Format . . . . . . . . . . . . . . . . . . . 4
4. Encapsulating Flow Monitor Option . . . . . . . . . . . . . . 6
4.1. Flow Monitoring Identification . . . . . . . . . . . . . 6
5. Flow Measurement Operation . . . . . . . . . . . . . . . . . 7
5.1. Packet Loss Measurement . . . . . . . . . . . . . . . . . 7
5.2. Packet Delay Measurement . . . . . . . . . . . . . . . . 7
5.3. Measurement Type . . . . . . . . . . . . . . . . . . . . 8
5.4. Two-way Flow Measurement . . . . . . . . . . . . . . . . 8
5.5. Data Collection and Report . . . . . . . . . . . . . . . 9
5.6. Function Extension Consideration . . . . . . . . . . . . 9
5.6.1. The Use of Ext FM Type Bitmap . . . . . . . . . . . . 10
5.6.2. Bitmap Extension . . . . . . . . . . . . . . . . . . 10
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
7. Security Considerations . . . . . . . . . . . . . . . . . . . 12
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
8.1. Normative References . . . . . . . . . . . . . . . . . . 12
8.2. Informative References . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 13
1. Introduction
The Alternate-Marking is a kind of marking method for Passive and
Hybrid Performance Monitoring, and presented in [RFC8321]. Likewise,
[RFC8889] is Multipoint Alternate-Marking Method for Passive and
Hybrid Performance Monitoring.
The Alternate-Marking method, as described in [RFC8321] and
[RFC8889], allows the synchronization of the measurements in
different points by dividing the packet flow into batches. So it is
possible to get coherent counters and show what is happening in every
marking period for each monitored flow. Based on this ability, the
method could be used to perform packet loss, delay and jitter
measurements on live traffic.
This document discusses how to deploy performance measurement based
on Alternate-Marking method in IPv6 domain. The measurement
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operation is described and the applications are proposed in
Section 5.
A specific data structure is defined to carrying in-situ flow
measurement data with traffic flow, and the extensibility is taken
into account in designing. The structure is called Flow Monitor
Option, and detail is in Section 3.
How to encapsulate the Flow Monitor Option in IPv6 traffic flow is
discussed in Section 2. A new type of IPv6 Extension Header is
proposed, Flow Monitor Option is encapsulated in Hop-by-Hop options
Header or Destination Options Header depending on the measurement
type.
1.1. 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.
1.2. Terminology
The definitions of the basic terms are identical to those found in
Alternate Marking [RFC8321] and Multipoint Alternate-Marking
[RFC8889].
The important new terms that need to be explained are listed below:
ACL: access-control list
2. Flow Measurement in IPv6 Network
2.1. Carrying Flow Measurement Data
The flow measurement method described by this document need to add
measurement data in the flow used to perform measure. In IPv6, the
general way to carry packet's additional information is IPv6
Extension Header. Several IPv6 Extension Headers have been defined
in [RFC8200]. It is necessary to determine suitable Ipv6 Extension
Header to carry measuring data for deploying of performance measure
in IPv6.
There are two measurement types: End-to-End and Hop-by-Hop. The
participating nodes in two types are different.
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The source node allocates measurement data and encodes it in packet.
For End-to-End measurement, just destination node processes the
measuring data. According to Section 4.1 of [RFC8200], IPv6
Destination Options Header before the upper-layer header is
appropriate for End-to-End measurement.
For Hop-by-Hop measurement, all nodes on the delivery path are
expected to examine and process the measurement data. According to
[RFC8200], the measurement data can be carried as an option of Hop-
by-Hop Options Header.
2.2. Flow Measurement Data Definition
As description in Section 2.1, flow measurement data is encoded in
IPv6 Destination Options Header and IPv6 Hop-by-Hop Options Header.
Flow measurement data structure must be defined following IPv6
Option's principle.
This document defines Flow Monitor Option for flow measurement.
Using Flow Monitor Option to marking packets required by Alternate-
Marking, and to carry flow identity and measure parameters.
3. Definition of Flow Monitor Option
Flow Monitor Option is defined to carry flow measurement data, below
is detailed description.
3.1. Data Fields Format
The following figure shows the data field's format for Flow Monitor
Option. This flow monitoring and measurement data structure can be
encapsulated in the Hop-by-Hop Options Header and Destination Options
Header.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Option Type | Opt Data Len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| FlowMonID |L|D| R | HTI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| NodeMonID |F| P | Rsv |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Ext FM Type | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: Flow Monitor Option
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where:
o Option Type: 8-bit identifier of the type of Flow Monitor Option.
The encoding format references Section 4.2 of [RFC8200]. The
value is to be assigned by IANA.
o Opt Data Len: The length of the Option Data Fields of this option
in bytes.
o FlowMonID: 20 bits unsigned integer. The FlowMon identifier is
used to identify one flow in the node.
o L: Loss Flag, a marking bit of packet loss measurement.
o D: Delay Flag, a marking bit of packet delay measurement.
o R: Reserved for future use, now initialized to zero for
transmission and ignored on reception.
o HTI: Header Type Indication. It indicates the type of the option
header, has the following value:
* 0: Reserved, indicate that the format of Flow Monitor Option is
the same as [I-D.ietf-6man-ipv6-alt-mark].
* 1~15: Private type.
* 16~255: Extensible type value. When the value is 16, the
format of the option header is as shown in Figure 2.
o NodeMonID: 20 bits unsigned integer. It is used to identify a
node in the measurement domain, combined with the FlowMonID field
to uniquely identify a monitored flow. Detail description sees
Section 4.1.
o F: The marking bit of two-way flow measurement. If the field is
set to 1, the end node generates reverse flow measurement
configuration dynamically according to the current flow.
o P: 3 bits, measurement period. It has the following values:
* 000: 1 second
* 001: 10 seconds
* 010: 30 seconds
* 011: 60 seconds
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* 100: 300 seconds
* Others: Reserved
o Ext FM Type: A 16 bits Bitmap for Extended Flow Measurement type.
The Bitmap can present 15 different measurement types. From bit 0
to 14, each bit presents a specific measurement type. The bit15
is reserved for extension Bitmap, 1 indicates carrying the
extension Bitmap. The use case about Ext FM Type is described in
Section 5.6.
4. Encapsulating Flow Monitor Option
When flow measurement is enabled, source node allocates Flow Monitor
Option for monitored flows, fills measurement parameters, sets
marking bits, and adds an extension header for packet encapsulating
the Flow Monitor Option.
For Hop-by-Hop measurement, the Flow Monitor Option is encapsulated
in the Hop-by-Hop Options Header.
For End-to-End measurement, the Flow Monitor Option is encapsulated
in the Destination Options Header before the upper-layer header.
4.1. Flow Monitoring Identification
The Flow Monitoring Identification is required for some general
reasons:
First, it helps to reduce the per node configuration. Otherwise,
each node needs to configure an access-control list (ACL) for each of
the monitored flows. Moreover, using a Flow Monitoring
Identification allows a flexible granularity for the flow definition.
Second, it simplifies the counters handling. Hardware processing of
flow tuples (and ACL matching) is challenging and often incurs into
performance issues, especially in tunnel interfaces.
Third, it eases the data export encapsulation and correlation for the
collectors.
The NodeMon identifier (NodeMonID) field is filled with the source
node's identifier. The NodeMonID as configuration is set on the
source node by the central controller. The controller ensures
NodeMonID is unique within the measurement domain.
The FlowMon identifier (FlowMonID) field is used to uniquely identify
a monitored flow within a specified source node. The FlowMonID can
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be uniformly assigned by the central controller, also can be
algorithmically generated by the source node based on the flow
information.
Using the combination of FlowMonID and NodeMonID, a monitored flow
can be uniquely identified within the measurement domain. The
FlowMonID field and NodeMonID field are set at the source node.
5. Flow Measurement Operation
[RFC8321] describes a method to perform packet loss, delay and jitter
measurements on live traffic. This section describes how the method
can be applied in IPv6 network.
5.1. Packet Loss Measurement
The L marking bit in the Flow Monitor Option is used to color the
flows that need packet loss measurement. By setting the L marking
bit to 1 or 0 according to the measurement period filled in P field
in the source node, the monitored flows can be split into consecutive
blocks. The intermediate and end nodes read the L marking bit and
identify the packet blocks. By counting the number of packets in
each block and comparing the values measured by different nodes along
the path, it is possible to measure packet loss occurred in any
single block between any two points.
5.2. Packet Delay Measurement
The same principle used to measure packet loss also can be applied to
one-way delay measurement. Packet delay measurement references
Double-Marking Method described in [RFC8321] using the L marking bit
and D marking bit in Flow Monitor Option.
The L marking bit is used to mark the alternate flow. By marking the
L marking bit to 1 or 0, the monitored flows can be split into
consecutive blocks. And, within this colored flow identified by the
L marking bit, a second marked D marking bit is used to select the
packets for measuring delay. The D marking bit creates a new set of
marked packets that are fully identified over the network, so that a
network node can store the timestamps of these packets; these
timestamps can be compared with the timestamps of the same packets on
a second node to compute packet delay values for each packet.
Likewise to packet delay measurement, the on-path jitter can be
measured by measuring multiple blocks.
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5.3. Measurement Type
For different measurement requirements, there are End-to-End
measurement type and Hop-by-Hop measurement type.
With the End-to-End measurement type, it can measure the forwarding
performance between source node and end node when the traffic passes
through the measurement domain. The performance of each intermediate
node or link is not cared about. Therefore, when using the End-to-
End measurement type, only the source node and end node need to
collect performance data and report data to controller.
With the Hop-by-Hop measurement type, each node along the path which
has enabled performance measurement SHOULD collect performance data
and report data to the controller when the traffic passes through the
measurement domain.
Compared to the End-to-End measurement type, the Hop-by-Hop
measurement type can more accurately locate the network packet loss
and delay in position.
The measurement type is determined by the position of Flow Monitor
Option in the IPv6 Extension Header. The Flow Monitor Option can be
encapsulated in Hop-by-Hop Options Header or Destination Options
Header. When it is encapsulated in the Hop-by-Hop Options Header,
each node along the path will deal with it. That is Hop-by-Hop
measurement. When the Flow Monitor Option is encapsulated in the
Destination Options Header, it means End-to-End measurement.
5.4. Two-way Flow Measurement
As described in [RFC8321] the source node needs to virtually split
traffic flows into consecutive blocks according to some methods, such
as configuring an access-control list (ACL) for each of the monitored
flows. But, if we want to measure bidirectional forwarding
performance of monitored flows on the specified path, we need to
configure ACLs associated monitored flows on the source node and end
node at the same time. This will increase the configuration and
maintenance workload. And this work is more complex, such as source
IP addresses in the source node configuration need to be transformed
as destination IP addresses in the end node, and other
characteristics are similar.
Therefore, this document provides a two-way flow measurement method.
It generates reverse flow measurement configuration dynamically in
the end node according to the forward flow.
Two-way flow performance measurement is implemented as follows:
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1. The source node configures ACLs for monitored flows that need
bidirectional flow measurement.
2. When the source node receives the corresponding monitored flow,
it encapsulates Flow Monitor Option into the IPv6 Extension Header,
and sets the F field to 1.
3. When the end node receives the monitored flow which F field has
been set to 1, it analysis the information of positive monitored
flow, changes the source and destination information, dynamically
generates ACLs with the characteristics of reverse monitored flows,
and distributes configuration on end node.
4. At the same time, the end node assigns FlowMonID for reverse
monitored flows, and reports the new reserve FlowMonID, the NodeMonID
of the end node and the reverse flow information to controller.
5. When the end node receives the reserve monitored flow, the end
node encapsulates Flow Monitor Option into IPv6 Extension Header,
sets F field to 0, uses the FlowMonID and NodeMonID of end node, and
fills other fields of Flow Monitor option according to the end node's
configuration.
6. All nodes along the reserve path enabled performance measurement
collect performance data, report to controller according Flow Monitor
option in the packet header.
5.5. Data Collection and Report
Each node which participates in performance measurement collects
performance data, records packet counts, received timestamps, sent
timestamps, FlowMonID, NodeMonID and other related information
specified by Flow Measure Type bitmap, and reports to the controller.
For the source node, it needs to report characteristic information of
monitored flow additionally.
The network nodes report to controller by Telemetry technique. The
period of report can be the measurement period filled in the P field
of Flow Monitor Option, can also be specified in the Telemetry
subscription, or is designated by local configuration. This document
does not limit the specific method.
5.6. Function Extension Consideration
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5.6.1. The Use of Ext FM Type Bitmap
At present, the performance measurement is commonly attention to
network packet loss, delay and jitter. However, with the expanding
of network applications, other network performance parameters begin
to be concerned, such as out-of-order rate. When network failure,
controller wants to be able to obtain more abundant information, and
in order to locate fault point quickly requires all nodes along the
path to report current queue depth, input and output interface name,
and so on.
By defining bits of Ext FM Type field in the Flow Monitor Option and
carrying additional information in the monitored flows, the
measurement function can be extended.
For example, in order to measure out-of-order rate, bit0 of Ext FM
Type is defined as an out-of-order measurement mark. When the source
node receives monitored flow, it sets bit0 to indicate to count out-
of-order packets. At the same time, it fills in additional
information after Ext FM Type bitmap with ordinal Sequence
parameters. After extension, the Flow Monitor Option package format
is 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| FlowMonID |L|D| R | HTI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| NodeMonID |F| P | Rsv |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1| | Bit0 Data(Sequence Num) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
. .
. Bit0 Data(Other information) .
. .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: Use Bit0 For Out-of-order Measurement
Using the same method, the other bits of Ext FM Type field can be
extended. Additional information is optional, whether it is carried
is decided by the specified extension function.
5.6.2. Bitmap Extension
The Ext FM Type field has 16 bit, so 16 measurement functions can be
extended. For general applications, the bitmap is enough. In order
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to reduce the effect on forwarding performance, it is also not
recommended too much measurement processes at the same time.
However, considering functionality to be expanded in the future,
bit15 is reserved, used to break the bitmap limit of 16. If bit15 is
set to 1, it indicates carrying the extension bitmap. By default,
bit15 is zero.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| FlowMonID |L|D| R | HTI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| NodeMonID |F| P | Rsv |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Ext FM Type(Bitmap) |1| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
. .
. Additional Data of FM Bitmap (Optional) .
. .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Extension Bitmap | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
. .
. Additional Data of Extension Bitmap (Optional) .
. .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 3: Extension Bitmap Format
Based on the previous out-of-order measurement example, for example,
after the bits of Ext FM Type have been exhausted, use bit2 of
Extension Bitmap to expand FM type. Flow Monitor Option package
format is as shown 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| FlowMonID |L|D| R | HTI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| NodeMonID |F| P | Rsv |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1|0|0|0|0|0|0|0|0|0|0|0|0|0|0|1| Bit0 Data (Sequence Num) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
. .
. Bit0 Data(Other information) .
. .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|1|0|0|0|0|0|0|0|0|0|0|0|0|0| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
. .
. Extension Bit2 Data (Optional) .
. .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 4: Extension Bit2 Example
6. IANA Considerations
The Flow Monitor Option Type should be assigned in IANA.
7. Security Considerations
The potential security threats of Alternate-Marking method have been
described in detail in Section 9 of [RFC8321]. The performance
measurement method described in this document does not introduce
additional new security issues.
8. References
8.1. Normative References
[I-D.ietf-6man-ipv6-alt-mark]
Fioccola, G., Zhou, T., Cociglio, M., Qin, F., and R.
Pang, "IPv6 Application of the Alternate Marking Method",
draft-ietf-6man-ipv6-alt-mark-16 (work in progress),
July 2022.
[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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[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>.
[RFC8200] Deering, S. and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", STD 86, RFC 8200,
DOI 10.17487/RFC8200, July 2017,
<https://www.rfc-editor.org/info/rfc8200>.
8.2. Informative References
[RFC8321] Fioccola, G., Ed., Capello, A., Cociglio, M., Castaldelli,
L., Chen, M., Zheng, L., Mirsky, G., and T. Mizrahi,
"Alternate-Marking Method for Passive and Hybrid
Performance Monitoring", RFC 8321, DOI 10.17487/RFC8321,
January 2018, <https://www.rfc-editor.org/info/rfc8321>.
[RFC8889] Fioccola, G., Ed., Cociglio, M., Sapio, A., and R. Sisto,
"Multipoint Alternate-Marking Method for Passive and
Hybrid Performance Monitoring", RFC 8889,
DOI 10.17487/RFC8889, August 2020,
<https://www.rfc-editor.org/info/rfc8889>.
Authors' Addresses
Haojie Wang
China Mobile
Email: wanghaojie@chinamobile.com
Yisong Liu
China Mobile
Email: liuyisong@chinamobile.com
Changwang Lin
New H3C Technologies
Email: linchangwang.04414@h3c.com
Xiao Min
ZTE Corporation
Email: xiao.min2@zte.com.cn
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