MPLS Working Group W. Cheng
Internet-Draft China Mobile
Intended status: Standards Track X. Min
Expires: 13 September 2023 ZTE Corp.
12 March 2023
MNA for Performance Measurement with Alternate Marking Method
draft-cx-mpls-mna-inband-pm-00
Abstract
MPLS Network Action (MNA) is used to indicate action for Label
Switched Paths (LSPs) and/or MPLS packets and to transfer data needed
for the action.
This document defines MNA encoding for MPLS performance measurement
with alternate marking method, which performs flow-based packet loss,
delay, and jitter measurements on MPLS live traffic.
Status of This Memo
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Copyright Notice
Copyright (c) 2023 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. MPLS Network Action for Flow-based PM . . . . . . . . . . . . 3
3. Security Considerations . . . . . . . . . . . . . . . . . . . 4
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.1. Normative References . . . . . . . . . . . . . . . . . . 4
6.2. Informative References . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
MPLS Network Action (MNA) is used to indicate action for Label
Switched Paths (LSPs) and/or MPLS packets and to transfer data needed
for the action.
To addressing the MNA requirements [I-D.ietf-mpls-mna-requirements]
and by following the MNA framework [I-D.ietf-mpls-mna-fwk],
[I-D.ietf-mpls-mna-hdr] defines the MNA sub-stack solution for
carrying Network Actions and Ancillary Data in the label stack.
As specified in [I-D.ietf-mpls-inband-pm-encapsulation], Flow-ID
Label, L bit and D bit are used for MPLS flow identification and
flow-based performance measurement with alternate marking method,
which can be an applicable MNA usecase [I-D.ietf-mpls-mna-usecases].
This document defines MNA encoding for MPLS performance measurement
with alternate marking method, which performs flow-based packet loss,
delay, and jitter measurements on MPLS live traffic. The proposed
MNA encoding is compliant with the MNA sub-stack solution specified
in [I-D.ietf-mpls-mna-hdr] and reuses the data fields specified in
[I-D.ietf-mpls-inband-pm-encapsulation].
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1.1. Terminology
This document makes use of the terms defined in
[I-D.ietf-mpls-inband-pm-encapsulation] and [I-D.ietf-mpls-mna-hdr].
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. MPLS Network Action for Flow-based PM
The MNA format for performance measurement with alternate marking
method is illustrated as below:
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Opcode=3 | Bit-Position=TBA1 |R|IHS|S| Res |U| NASL=1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1| Flow-ID |L|D|S| Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: MNA for Alternate Marking
The description of MNA for Alternate Marking is as follows:
* Name: Performance Measurement with Alternate Marking Method
(PMAMM) Action.
* Network Action Indication: The PMAMM Action indication is bit
position TBA1.
* Scope: The PMAMM Action is valid in all scopes.
* In-Stack Data: The PMAMM Action carries 30 bits of ancillary data.
The most significant 20 bits of ancillary data is the Flow-ID
Value, immediately followed by L bit and D bit. The least
significant 8 bits of ancillary data is reserved. The three
fields Flow-ID Value, L bit and D bit have semantics consistent
with the Flow-ID Label, L bit and D bit defined in
[I-D.ietf-mpls-inband-pm-encapsulation]. While the Flow-ID Label
has some restrictions to avoid collisions with the reserved label
space (0-15) [RFC3032], those restrictions are not necessary for
the Flow-ID Value and do not apply. The forwarding node in the
scope of PMAMM Action SHOULD execute flow-based performance
measurement by using the Flow-ID Value, L bit and D bit.
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* Post-Stack Data: None.
Ed.note: There is ongoing discussion in MPLS mailing list on whether
to omit "Flag-based NAI with AD" from [I-D.ietf-mpls-mna-hdr], if the
WG decision is to omit "Flag-based NAI with AD", then the MNA format
described above would be changed from "Flag-based NAI with AD" to
"New Opcode with AD".
3. Security Considerations
Security issues discussed in [I-D.ietf-mpls-inband-pm-encapsulation]
and [I-D.ietf-mpls-mna-hdr] apply to this document.
4. IANA Considerations
This document requests that IANA allocate a bit position (TBA1) from
the MPLS "In-Stack MPLS Network Action Indicator Flags" registry for
the Performance Measurement with Alternate Marking Method Action.
Specifically, this document requests the following allocation from
IANA.
MNA Flag Bit-Position Description
-------- ------------ -----------
P TBA1 PM with Alternate Marking Method
5. Acknowledgements
To be added.
6. References
6.1. Normative References
[I-D.ietf-mpls-inband-pm-encapsulation]
Cheng, W., Min, X., Zhou, T., Dong, X., and Y. Peleg,
"Encapsulation For MPLS Performance Measurement with
Alternate Marking Method", Work in Progress, Internet-
Draft, draft-ietf-mpls-inband-pm-encapsulation-05, 12
March 2023,
.
[I-D.ietf-mpls-mna-hdr]
Rajamanickam, J., Gandhi, R., Zigler, R., Song, H., and K.
Kompella, "MPLS Network Action (MNA) Sub-Stack Solution",
Work in Progress, Internet-Draft, draft-ietf-mpls-mna-hdr-
01, 8 March 2023, .
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[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
.
[RFC3032] Rosen, E., Tappan, D., Fedorkow, G., Rekhter, Y.,
Farinacci, D., Li, T., and A. Conta, "MPLS Label Stack
Encoding", RFC 3032, DOI 10.17487/RFC3032, January 2001,
.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, .
6.2. Informative References
[I-D.ietf-mpls-mna-fwk]
Andersson, L., Bryant, S., Bocci, M., and T. Li, "MPLS
Network Actions Framework", Work in Progress, Internet-
Draft, draft-ietf-mpls-mna-fwk-03, 11 March 2023,
.
[I-D.ietf-mpls-mna-requirements]
Bocci, M., Bryant, S., and J. Drake, "Requirements for
MPLS Network Actions", Work in Progress, Internet-Draft,
draft-ietf-mpls-mna-requirements-04, 13 October 2022,
.
[I-D.ietf-mpls-mna-usecases]
Saad, T., Makhijani, K., Song, H., and G. Mirsky, "Use
Cases for MPLS Network Action Indicators and MPLS
Ancillary Data", Work in Progress, Internet-Draft, draft-
ietf-mpls-mna-usecases-01, 24 October 2022,
.
Authors' Addresses
Weiqiang Cheng
China Mobile
Beijing
China
Email: chengweiqiang@chinamobile.com
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Xiao Min
ZTE Corp.
Nanjing
China
Email: xiao.min2@zte.com.cn
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