MPLS Working Group G. Mirsky
Internet-Draft Ericsson
Intended status: Standards Track L. Zhang
Expires: 1 September 2025 L. Andersson
Huawei Technologies
28 February 2025
Simple Two-way Active Measurement Protocol (STAMP) for MPLS Label
Switched Paths (LSPs)
draft-mirsky-mpls-stamp-12
Abstract
Simple Two-way Active Measurement Protocol (STAMP), defined in RFC
8762 and RFC 8972, is expected to be able to monitor the performance
of paths between systems that use a wide variety of encapsulations.
This document defines encapsulation and bootstrapping of a STAMP test
session over an MPLS Label Switched Path.
Status of This Memo
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Copyright Notice
Copyright (c) 2025 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Please review these documents carefully, as they describe your rights
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Conventions Used in this Document . . . . . . . . . . . . 3
1.1.1. Abbreviations . . . . . . . . . . . . . . . . . . . . 3
1.1.2. Requirements Language . . . . . . . . . . . . . . . . 3
2. Encapsulation of a STAMP Test Packet . . . . . . . . . . . . 3
3. Bootstrap STAMP Using LSP Ping . . . . . . . . . . . . . . . 4
3.1. STAMP Session Identifier TLV . . . . . . . . . . . . . . 4
3.2. Return Codes . . . . . . . . . . . . . . . . . . . . . . 6
4. STAMP Session Establishment . . . . . . . . . . . . . . . . . 7
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
5.1. STAMP Session Identifier TLV . . . . . . . . . . . . . . 7
5.2. Return Codes . . . . . . . . . . . . . . . . . . . . . . 8
6. Security Considerations . . . . . . . . . . . . . . . . . . . 8
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 8
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
8.1. Normative References . . . . . . . . . . . . . . . . . . 8
8.2. Informational References . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
[RFC8762] and [RFC8972] defined the base specification and optional
extensions of the Simple Two-Way Active Measurement Protocol (STAMP).
The reader is expected to be familiar with the terminology of
[RFC8762] and [RFC8972]. STAMP can be used to measure packet loss,
and packet delay, detect packet re-ordering, and unwanted multiple
copies of a STAMP packet. This document defines the encapsulation of
the STAMP test packet over a Multiprotocol Label Switching (MPLS)
Label Switched Path (LSP). Also, the use of LSP Ping [RFC8029] to
bootstrap and control the path for the reflected STAMP test packet is
discussed in the document. [RFC8762] defined two modes of a STAMP
Session-Reflector - Stateful and Stateless. While using the LSP Ping
extension to bootstrap a STAMP test session applies for both Session-
Reflector modes, controlling the path for the reflected STAMP test
packet is appropriate for the Stateful mode of the Session-Reflector
only.
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This document defines the STAMP Session Identifier TLV as an
extension to LSP Ping [RFC8029]. It is to be used to instruct the
STAMP Session-Reflector how to demultiplex incoming STAMP test
sessions and a path to use for the reflected STAMP test packets. The
TLV will be allocated from the TLV and sub-TLV registry defined in
[RFC8029]. As a special case, forward and reverse directions of the
STAMP test session can form a bi-directional co-routed associated
channel.
1.1. Conventions Used in this Document
1.1.1. Abbreviations
STAMP: Simple Two-way Active Measurement Protocol
MPLS: Multiprotocol Label Switching
LSP: Label Switched Path
LSR: Label Switching Router
SSID: STAMP Session Identifier
1.1.2. 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.
2. Encapsulation of a STAMP Test Packet
STAMP can be used to measure one-way and roud-trip packet loss and
packet delay, and detect packet re-ordering, and unwarranted
replication of a STAMP test packet. [RFC8762] defined formats of a
STAMP test packet and reflected STAMP test packet in unauthenticated
and authenticated modes, respectively. These STAMP test packets can
be encapsulated in IP/UDP to be transmitted over an MPLS LSP as
follows:
* The STAMP test packet sent by the ingress Label Switching Router
(LSR) SHOULD be a UDP packet with a well-known destination port
862 [RFC8762] and a source port assigned by the sender. The
destination UDP port MAY be selected from the Dynamic UDP ports
range. The mechanism used to select the port number from the
Dynamic range is outside the scope of this document.
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* The destination IP address MUST be chosen from the 127/8 range for
IPv4. For IPv6, the destination address MUST be chosen from the
IPv6 Dummy Prefix range
[IANA-IPv6-Special-Purpose-Address-Registry]. Method of selecting
an IP address from the range is outside the scope of this
document.
* For the STAMP test packet, the sender MUST set the IP TTL or hop
limit to 255 [RFC5082].
* The source IP address is a routable address of the sender.
* The reflected STAMP test packets are UDP packets.
* The source IP address of a reflected STAMP test packet is a
routable address of the STAMP Session-Reflector.
3. Bootstrap STAMP Using LSP Ping
A STAMP test session over an MPLS LSP can be bootstrapped using LSP
Ping, defined in [RFC8029]. To bootstrap a STAMP test session, STAMP
Session Identifier TLV MUST be used. When LSP Ping is used to
bootstrap a STAMP test session, the Reply Mode field SHOULD be set to
"Reply via an IPv4/IPv6 UDP packet" (2) value. In some environments,
e.g., point-to-multipoint LSP, the Reply Mode field MAY be set to "Do
not reply" (1). The value of the Reply Mode field MUST NOT be set to
"Reply via an IPv4/IPv6 UDP packet with Router Alert" (3) [RFC9570].
This document defines a new TLV - the STAMP Session Identifier (SSID)
TLV. The SSID TLV MUST contain the STAMP Session Identifier (SSID)
[RFC8972] value and MAY contain none, one or more sub-TLVs that can
be used to carry information about the path for reflected STAMP test
packet.
3.1. STAMP Session Identifier TLV
The STAMP Session Identifier TLV is an optional TLV within the LSP
Ping [RFC8029]. The STAMP Session Identifier TLV carries SSID value
and, optionally, information about the path onto which the STAMP
Session-Reflector MUST transmit reflected STAMP test packets for the
given STAMP test session. The format of the STAMP Session Identifier
TLV is as presented in Figure 1.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| STAMP Session Id TLV Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSID | UDP Destination Port Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Sub-TLVs (optional) ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: STAMP Session Identifier TLV
STAMP Session Identifier Type is a two-octet field and has a value of
TBD1 (to be assigned by IANA as requested in Section 5).
Length is a two-octet field equal to the length in octets of the
SSID, UDP Destination Port Number, Reserved, and Sub-TLVs fields.
The minimum value MUST be eight.
SSID field is a two-octet field that identifies the STAMP test
session at the STAMP Session-Sender.
UDP Destination Port Number is a two-octet field. The field
indicates the value of the UDP destination port in test packet
transmitted by the Session-Sender for the test session with SSID.
The Session-Sender MAY set the value of the field to 862 that is
assigned by IANA as TWAMP-Test Receiver Port. If the value of the
field is not equal to 862 then it MUST be one from the range of
Dynamic ports, i.e., from 49152 to 65535. Any other value of the UDP
Destination Port Number field is invalid and the Session-Reflector
MUST send an Echo Reply message with the received STAMP Session
Identifier TLV and set the Return Code field to "UDP Destination Port
Unavailable" (Section 5.2).
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Sub-TLVs field contains zero or more sub-TLVs, i.e., nested TLVs that
have independent types and MUST be four-octet aligned. This field
MAY be used to define the path of the reflected STAMP test packet.
In that case, Only non-multicast Target FEC Stack sub-TLVs (already
defined or to be defined in the future) for TLV Types 1, 16, and 21
in the "Multiprotocol Label Switching (MPLS) Label Switched Paths
(LSPs) Ping Parameters" registry are permitted to be used in this
field. Other sub-TLVs MUST NOT be used. (This implies that
multicast Target FEC Stack sub-TLVs, e.g., the Multicast P2MP LDP FEC
Stack sub-TLV and the Multicast MP2MP LDP FEC Stack sub-TLV, are not
permitted in the Sub-TLVs field.) If no Target FEC Stack sub-TLVs
are found in the STAMP Session Identifier TLV, the STAMP Session-
Reflector MUST revert to transmitting the STAMP reflected packets
over the IP network.
If the STAMP Session-Reflector cannot find the path specified in the
STAMP Session Identifier TLV, it MUST send Echo Reply with the
received STAMP Session Identifier TLV and set the Return Code to "The
specified Reflected Packet Path was not found" (Section 5.2).
The STAMP Session Identifier TLV MAY be used in the bootstrapping of
a STAMP test session. A STAMP Session-Reflector that supports this
specification MUST support subsequent STAMP Session Identifier TLVs
after the STAMP test session with the given SSID has been
established. The system that receives a new path in the Sub-TLVs
field for the established STAMP test session MUST use the new path
for the reflected STAMP test packets. Suppose a system that supports
this specification receives an LSP Ping with the STAMP Session
Identifier TLV with no Target FEC Stack sub-TLVs in the Sub-TLVs
field, even though the reflected test packets for the specified STAMP
test session has been transmitted according to the previously
received STAMP Session Identifier TLV. In that case, the egress LSR
MUST transition to transmitting reflected STAMP packets over an IP
network.
3.2. Return Codes
This document defines the following Return Codes for MPLS LSP Echo
Reply:
* "The specified Reflected Packet Path was not found", (TBD2). When
a specified reverse path is not available at the STAMP Session-
Reflector an Echo Reply with the Return Code set to "The specified
Reflected Packet Path was not found" MUST be sent back to the
STAMP Session-Sender Section 3.1.
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* "UDP Destination Port Unavailable" (TBD3). If the value of the
Destination UDP Port Number field is not 862, nor is from the
Dynamic ports range, the Session-Reflector MUST send an Echo Reply
to the Session-Sender with the Return Code set to "UDP Destination
Port Unavailable".
4. STAMP Session Establishment
A STAMP test session can be bootstrapped using LSP Ping. To monitor
performance for a particular MPLS LSP and FEC combination LSP Ping
Echo request and Echo reply packets, in the ping mode, exchanged
between the STAMP Session-Sender and Session-Reflector for that MPLS
LSP and FEC combination. If LSP Ping is used to establishing a STAMP
test session, an LSP Ping Echo request message MUST carry the SSID
value assigned by the Session-Sender for the STAMP test session.
This MUST subsequently be used as the SSID field in the STAMP test
session packets sent by the STAMP Session-Sender.
On receipt of the LSP Ping Echo request message, the STAMP Session-
Reflector MUST send an LSP Ping Echo reply if the validation of the
FEC in the LSP Ping Echo request message succeeds. The Session-
Reflector SHOULD use the value in the SSID field and source IP
address in the received LSP Ping Echo request message to demultiplex
STAMP test sessions. The Session-Reflector MAY use a combination of
other values in IP/UDP headers instead of using SSID to demultiplex
STAMP test sessions.
If the MPLS network includes an equal-cost multipath environment, a
STAMP Session-Sender MUST use the same value of an Entropy Label
([RFC6790] and [RFC8662]) in the LSP Ping Echo request that
bootstraps the STAMP test session and consecutive STAMP test packets.
5. IANA Considerations
5.1. STAMP Session Identifier TLV
The IANA is requested to assign a new value for the “STAMP Session
Identifier TLV” from the Standard Action range (0-16383), that
requires a response if not recognized, from the “TLVs registry” in
the “Multiprotocol Label Switching (MPLS) Label Switched Paths (LSPs)
Ping Parameters” registry group.
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+=========+==============================+===============+
| Value | Description | Reference |
+=========+==============================+===============+
| (TBD1) | STAMP Session Identifier TLV | This document |
+---------+------------------------------+---------------+
Table 1: New BFD Reverse Type TLV
5.2. Return Codes
IANA is requested to assign two new Return Codes from the Standards
Action range of the Return Codes registry in the “Multiprotocol Label
Switching (MPLS) Label Switched Paths (LSPs) Ping Parameters”
registry group.
+=========+============================+===============+
| Value | Description | Reference |
+=========+============================+===============+
| (TBD2) | The specified Reflected | This document |
| | Packet Path was not found. | |
+---------+----------------------------+---------------+
| (TBD3) | UDP Destination Port | This document |
| | Unavailable. | |
+---------+----------------------------+---------------+
Table 2: New Return Code
6. Security Considerations
Security considerations discussed in [RFC8029], [RFC8762], and
[RFC8972] apply to this document.
7. Acknowledgments
The authors sincerely appreciate Richard "Footer" Foote's thoughtful
comments. The authors express their sincere appreciation of the
thorough review and text contributed by Loa Andersson.
8. References
8.1. 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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[RFC6790] Kompella, K., Drake, J., Amante, S., Henderickx, W., and
L. Yong, "The Use of Entropy Labels in MPLS Forwarding",
RFC 6790, DOI 10.17487/RFC6790, November 2012,
<https://www.rfc-editor.org/info/rfc6790>.
[RFC8029] Kompella, K., Swallow, G., Pignataro, C., Ed., Kumar, N.,
Aldrin, S., and M. Chen, "Detecting Multiprotocol Label
Switched (MPLS) Data-Plane Failures", RFC 8029,
DOI 10.17487/RFC8029, March 2017,
<https://www.rfc-editor.org/info/rfc8029>.
[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>.
[RFC8662] Kini, S., Kompella, K., Sivabalan, S., Litkowski, S.,
Shakir, R., and J. Tantsura, "Entropy Label for Source
Packet Routing in Networking (SPRING) Tunnels", RFC 8662,
DOI 10.17487/RFC8662, December 2019,
<https://www.rfc-editor.org/info/rfc8662>.
[RFC8762] Mirsky, G., Jun, G., Nydell, H., and R. Foote, "Simple
Two-Way Active Measurement Protocol", RFC 8762,
DOI 10.17487/RFC8762, March 2020,
<https://www.rfc-editor.org/info/rfc8762>.
[RFC8972] Mirsky, G., Min, X., Nydell, H., Foote, R., Masputra, A.,
and E. Ruffini, "Simple Two-Way Active Measurement
Protocol Optional Extensions", RFC 8972,
DOI 10.17487/RFC8972, January 2021,
<https://www.rfc-editor.org/info/rfc8972>.
[RFC9570] Kompella, K., Bonica, R., and G. Mirsky, Ed., "Deprecating
the Use of Router Alert in LSP Ping", RFC 9570,
DOI 10.17487/RFC9570, May 2024,
<https://www.rfc-editor.org/info/rfc9570>.
8.2. Informational References
[IANA-IPv6-Special-Purpose-Address-Registry]
IANA, "IANA IPv6 Special-Purpose Address Registry",
<https://www.iana.org/assignments/iana-ipv6-special-
registry/iana-ipv6-special-registry.xhtml>.
[RFC5082] Gill, V., Heasley, J., Meyer, D., Savola, P., Ed., and C.
Pignataro, "The Generalized TTL Security Mechanism
(GTSM)", RFC 5082, DOI 10.17487/RFC5082, October 2007,
<https://www.rfc-editor.org/info/rfc5082>.
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Authors' Addresses
Greg Mirsky
Ericsson
Email: gregimirsky@gmail.com
Li Zhang
Huawei Technologies
China
Email: zhangli344@huawei.com
Loa Andersson
Huawei Technologies
Email: loa@pi.nu
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