Enhanced Alternate Marking Method
draft-zhou-ippm-enhanced-alternate-marking-10
The information below is for an old version of the document.
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| Authors | Tianran Zhou , Giuseppe Fioccola , Mauro Cociglio , Yisong Liu , Shinyoung Lee , Weidong Li | ||
| Last updated | 2022-08-28 | ||
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draft-zhou-ippm-enhanced-alternate-marking-10
IPPM T. Zhou, Ed.
Internet-Draft G. Fioccola
Intended status: Standards Track Huawei
Expires: 2 March 2023 M. Cociglio
Telecom Italia
Y. Liu
China Mobile
S. Lee
LG U+
W. Li
Huawei
29 August 2022
Enhanced Alternate Marking Method
draft-zhou-ippm-enhanced-alternate-marking-10
Abstract
This document extends the IPv6 Alternate Marking Option to provide
enhanced capabilities and allow advanced functionalities. With this
extension, it can be possible to perform thicker packet loss
measurements and more dense delay measurements with no limitation for
the number of concurrent flows under monitoring.
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 2 March 2023.
Copyright Notice
Copyright (c) 2022 IETF Trust and the persons identified as the
document authors. All rights reserved.
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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
described in Section 4.e of the Trust Legal Provisions and are
provided without warranty as described in the Revised BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Data Fields Format . . . . . . . . . . . . . . . . . . . . . 3
3. Security Considerations . . . . . . . . . . . . . . . . . . . 6
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.1. Normative References . . . . . . . . . . . . . . . . . . 7
5.2. Informative References . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
The Alternate Marking [RFC8321] and Multipoint Alternate Marking
[RFC8889] define the Alternate Marking technique that is a hybrid
performance measurement method, per [RFC7799] classification of
measurement methods. This method is based on marking consecutive
batches of packets and it can be used to measure packet loss,
latency, and jitter on live traffic.
The IPv6 AltMark Option [I-D.ietf-6man-ipv6-alt-mark] applies the
Alternate Marking Method to IPv6, and defines an Extension Header
Option to encode the Alternate Marking Method for both the Hop-by-Hop
Options Header and the Destination Options Header. Similarly, SRv6
AltMark [I-D.fz-spring-srv6-alt-mark] defines how Alternate Marking
data is carried as a TLV in the Segment Routing Header.
While the IPv6 AltMark Option implements the basic alternate marking
methodology, this document defines extended data fields for the
AltMark Option and provides enhanced capabilities to overcome some
challenges and enable future proof applications.
It is worth mentioning that the enhanced capabilities are intended
for further use and are optional.
Some possible enhanced applications MAY be:
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1. thicker packet loss measurements: the single marking method of
the base AltMark Option can be extended with additional marking
bits in order to get shortest marking periods under the same
timing conditions.
2. more dense delay measurements: than double marking method of the
base AltMark Option can be extended with additional marking bits
in order to identify down to each packet as delay sample.
3. increase the number of concurrent flows under monitoring: if the
20-bit FlowMonID is set independently and pseudo randomly, there
is a 50% chance of collision for 1206 flows. The size of
FlowMonIDcan can be extended to raise the entropy and therefore
to increase the number of concurrent flows that can be monitored.
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.
2. Data Fields Format
The Data Fields format is represented in Figure 1. An 4-bit
NH(NextHeader) field is allocated from the Reserved field of IPv6
AltMark Option [I-D.ietf-6man-ipv6-alt-mark]. It is worth
highlighting that remaining bits of the former Reserved field
continue to be reserved.
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| Reserved | NH |
+---------------------------------------+-+-+-----------+-------+
Figure 1: Figure 1: Data fields indicator for enhanced capabilities
The NH (NextHeader) field is used to indicate the extended data
fields which are used for enhanced capabilities:
NextHeader value of 0x00 is reserved for backward compatibility.
It means that there is no extended data field attached.
NextHeader values of 0x01-0x08 are reserved for private use or for
experimentation.
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NextHeader value of 0x09 indicates the extended data fields. The
format is showed in Figure 2.
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 Ext | Flag | Len | R |
+-------------------------------+-------+-------+-------+-------+
| MetaInfo | Padding (variable) |
+-------------------------------+-------------------------------+
// Padding (variable) //
+-------------------------------+-------------------------------+
Figure 2: Figure 2: Data fields extension for enhanced alternate
marking
where:
* FlowMonID Ext - 20 bits unsigned integer. This is used to extend
the FlowMonID to reduce the conflict when random allocation is
applied. The disambiguation of the FlowMonID field is discussed
in IPv6 AltMark Option [I-D.ietf-6man-ipv6-alt-mark].
* Flag - A 4-bit flag to indicate the special purpose usage (see
below).
* Len - Length. It indicates the length of the enhanced alternate
marking extension in bytes.
* R - Reserved for further use. These bits MUST be set to zero on
transmission and ignored on receipt.
* MetaInfo - A 16-bit Bitmap to indicate more meta data attached for
the enhanced function (see below).
* Padding - These bits MUST be set to zero when not being used.
The Flag is defined in Figure 3 as:
* bit 0 - Measurement mode, M bit. M=0, indicates that it is for
hop-by-hop monitoring. M=1, indicates that it is for end-to-end
monitoring.
* bit 2 - Flow direction identification, F bit. This flag is used
in the case backward direction flow monitoring is requested to be
set up automatically. F=1, indicates that the flow direction is
forward. F=0, indicates the flow direction is backward.
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* others (shown as R) - Reserved. MUST be set to zero and ignored
on receipt.
0 1 2 3
+-------+
|M|R|F|R|
+-------+
Figure 3: Figure 3: Flag data field
The MetaInfo is defined in Figure 4 as a bit map as follows:
0 1 2 3 4 5 6 7
+---------------+
| MetaInfo |
+---------------+
Figure 4: Figure 4: MetaInfo data field
* bit 0: indicates a 6 bytes Timestamp is attached after the
MetaInfo. Timestamp(s) stands for the number of seconds in the
timestamp. It will overwrite the Padding after MetaInfo.
Timestamp(ns) stands for the number of subseconds in the timestamp
with the unit of nano second. This Timestamp is filled by the
encapsulation node, and is taken all the way to the decapsulation
node. So that all the intermediate nodes could compare it with
its local time, and measure the one way delay.
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
+-------------------------------+
| Timestamp(s) |
+-------------------------------+-------------------------------+
| Timestamp(ns) |
+---------------------------------------------------------------+
Figure 5: Figure 5: Timestamp data field
* bit 1: indicates the control information with the following data
format is attached:
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
+---------------+---------------+-----------+-------------------+
| DIP Mask | SIP Mask | Control | Period |
+---------------+---------------+-----------+-------------------+
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Figure 6: Figure 6: Control words for backward direction flow
monitoring
This is used to set up the backward direction flow monitoring.
Where:
- DIP Mask: is the length of the destination IP prefix.
- SIP Mask: is the length of the source IP prefix.
- Control: indicates more match fields to set up the backward
direction flow monitoring.
- Period: indicates the alternate marking period with the unit of
second.
* bit 2: indicates a 4 bytes Sequence number with the following data
format is attached after the MetaInfo. Sole Sequence cound be
used to detect the out-of-order packets, in addition to the normal
loss measurement. More over, the Sequence can be used together
with the latency measurement, so as to get the per packet
timestamp.
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 |
+---------------------------------------------------------------+
Figure 7: Figure 7: Sequence number data field
It is worth noting that the meta data information specified above in
Figure 5, Figure 6 and Figure 7 must be ordered according to the
order of the MetaInfo bits.
3. Security Considerations
IPv6 AltMark Option [I-D.ietf-6man-ipv6-alt-mark] analyzes different
security concerns and related solutions. These aspects are valid and
applicable also to this document. In particular the fundamental
security requirement is that Alternate Marking MUST only be applied
in a specific limited domain, as also mentioned in [RFC8799].
4. IANA Considerations
This document has no request to IANA.
5. References
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5.1. Normative References
[I-D.fz-spring-srv6-alt-mark]
Fioccola, G., Zhou, T., and M. Cociglio, "Segment Routing
Header encapsulation for Alternate Marking Method", Work
in Progress, Internet-Draft, draft-fz-spring-srv6-alt-
mark-03, 5 August 2022,
<https://datatracker.ietf.org/api/v1/doc/document/draft-
fz-spring-srv6-alt-mark/>.
[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",
Work in Progress, Internet-Draft, draft-ietf-6man-ipv6-
alt-mark-16, 1 July 2022,
<https://datatracker.ietf.org/api/v1/doc/document/draft-
ietf-6man-ipv6-alt-mark/>.
[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>.
[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>.
[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>.
5.2. 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>.
[RFC8799] Carpenter, B. and B. Liu, "Limited Domains and Internet
Protocols", RFC 8799, DOI 10.17487/RFC8799, July 2020,
<https://www.rfc-editor.org/info/rfc8799>.
[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>.
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Authors' Addresses
Tianran Zhou
Huawei
156 Beiqing Rd.
Beijing
100095
China
Email: zhoutianran@huawei.com
Giuseppe Fioccola
Huawei
Riesstrasse, 25
80992 Munich
Germany
Email: giuseppe.fioccola@huawei.com
Mauro Cociglio
Telecom Italia
Via Reiss Romoli, 274
10148 Torino
Italy
Email: mauro.cociglio@telecomitalia.it
Yisong Liu
China Mobile
Beijing
China
Email: liuyisong@chinamobile.com
Shinyoung Lee
LG U+
71, Magokjungang 8-ro, Gangseo-gu
Seoul
Republic of Korea
Email: leesy@lguplus.co.kr
Weidong Li
Huawei
156 Beiqing Rd.
Beijing
100095
China
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Email: poly.li@huawei.com
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