PCEP Extensions for Reporting MPLS-TE LSP Performance Measurements with Stateful PCE
draft-gandhi-pce-pm-07
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| Authors | Rakesh Gandhi , Bin Wen , Colby Barth , Dhruv Dhody | ||
| Last updated | 2017-03-12 | ||
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draft-gandhi-pce-pm-07
PCE Working Group R. Gandhi
Internet-Draft Cisco Systems, Inc.
Intended Status: Standards Track B. Wen
Expires: September 13, 2017 Comcast
C. Barth
Juniper Networks
D. Dhody
Huawei Technologies
March 12, 2017
PCEP Extensions for Reporting MPLS-TE LSP Performance Measurements
with Stateful PCE
draft-gandhi-pce-pm-07
Abstract
The Path Computation Element Communication Protocol (PCEP) provides
mechanisms for Path Computation Elements (PCEs) to perform path
computations in response to Path Computation Clients (PCCs) requests.
The Stateful PCE extensions allow Stateful control of Multi-Protocol
Label Switching (MPLS) Traffic Engineering Label Switched Paths (TE
LSPs) using PCEP.
In certain networks, network performance data such as packet loss,
delay and delay variation (jitter) as well as bandwidth utilization
is a critical measure for Traffic Engineering (TE). This data
provides operators the characteristics of their networks for
performance evaluation that is required to ensure the Service Level
Agreements (SLAs). Performance Measurement (PM) mechanisms can be
employed to monitor these metrics end-to-end for TE Label Switched
Paths (LSPs). This document describes Path Computation Element
Protocol (PCEP) extensions for reporting such performance
measurements to an Active Stateful PCE for both PCE-Initiated and
PCC-Initiated LSPs.
Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as
Internet-Drafts.
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Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1. Dependencies and Considerations . . . . . . . . . . . . . 5
1.2. Auto-bandwidth Considerations . . . . . . . . . . . . . . 6
2. Conventions Used in This Document . . . . . . . . . . . . . . 7
2.1. Requirements Language . . . . . . . . . . . . . . . . . . 7
2.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 7
2.3. Measurement Units . . . . . . . . . . . . . . . . . . . . 7
3. Overview of the PCEP Extensions . . . . . . . . . . . . . . . 7
3.1. Report Thresholds . . . . . . . . . . . . . . . . . . . . 8
4. Sub-TLVs for Measurements Attributes . . . . . . . . . . . . . 9
4.1. Measurement-Enable sub-TLV . . . . . . . . . . . . . . . . 9
4.2. Measurement-Interval sub-TLV . . . . . . . . . . . . . . . 10
4.3. Report-Threshold sub-TLV . . . . . . . . . . . . . . . . . 10
4.4. Report-Threshold-Percentage sub-TLV . . . . . . . . . . . 11
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4.5. Report-Interval sub-TLV . . . . . . . . . . . . . . . . . 11
5. PCEP Extensions for Reporting Delay Measurement . . . . . . . 12
5.1. Delay Measurement Capability Advertisement . . . . . . . . 12
5.1.1. DELAY-MEASUREMENT-CAPABILITY TLV . . . . . . . . . . . 12
5.2. DELAY-MEASUREMENT-ATTRIBUTES TLV . . . . . . . . . . . . . 13
5.2.1. Delay Measurement Enable . . . . . . . . . . . . . . . 14
5.2.2. Delay Measurement Interval . . . . . . . . . . . . . . 14
5.2.3. Delay Measurement Report Threshold . . . . . . . . . . 14
5.2.4. Delay Measurement Report Threshold Percentage . . . . 14
5.2.5. Delay Measurement Report Interval . . . . . . . . . . 15
5.3. DELAY-MEASUREMENT Object . . . . . . . . . . . . . . . . . 15
6. PCEP Extensions for Reporting Loss Measurement . . . . . . . . 17
6.1. Loss Measurement Capability Advertisement . . . . . . . . 17
6.1.1. LOSS-MEASUREMENT-CAPABILITY TLV . . . . . . . . . . . 18
6.2. LOSS-MEASUREMENT-ATTRIBUTES TLV . . . . . . . . . . . . . 19
6.2.1. Loss Measurement Enable . . . . . . . . . . . . . . . 20
6.2.2. Loss Measurement Interval . . . . . . . . . . . . . . 20
6.2.3. Loss Measurement Report Threshold . . . . . . . . . . 20
6.2.4. Loss Measurement Report Threshold Percentage . . . . . 20
6.2.5. Loss Measurement Report Interval . . . . . . . . . . . 20
6.3. LOSS-MEASUREMENT Object . . . . . . . . . . . . . . . . . 21
7. PCEP Extensions for Reporting Bandwidth Utilization . . . . . 22
7.1. Bandwidth Utilization Capability Advertisement . . . . . . 22
7.1.1. BANDWIDTH-UTILIZATION-CAPABILITY TLV . . . . . . . . . 22
7.2. BW-UTILIZATION-MEASUREMENT-ATTRIBUTES TLV . . . . . . . . 23
7.2.1. Bandwidth Utilization Measurement Enable . . . . . . . 24
7.2.2. Bandwidth Utilization Measurement Interval . . . . . . 24
7.2.3. Bandwidth Utilization Report Threshold . . . . . . . . 24
7.2.4. Bandwidth Utilization Report Threshold Percentage . . 24
7.2.5. Bandwidth Utilization Report Interval . . . . . . . . 24
7.3. BANDWIDTH Object . . . . . . . . . . . . . . . . . . . . . 24
8. PCEP Procedure . . . . . . . . . . . . . . . . . . . . . . . . 25
8.1. Various MEASUREMENT-ATTRIBUTES TLVs . . . . . . . . . . . 25
8.2. The MEASUREMENT Objects . . . . . . . . . . . . . . . . . 26
9. Scaling Considerations . . . . . . . . . . . . . . . . . . . . 26
9.1. The PCNtf Message . . . . . . . . . . . . . . . . . . . . 26
10. Security Considerations . . . . . . . . . . . . . . . . . . . 27
11. Manageability Considerations . . . . . . . . . . . . . . . . 27
11.1. Control of Function and Policy . . . . . . . . . . . . . 27
11.2. Information and Data Models . . . . . . . . . . . . . . . 27
11.3. Liveness Detection and Monitoring . . . . . . . . . . . . 27
11.4. Verify Correct Operations . . . . . . . . . . . . . . . . 28
11.5. Requirements On Other Protocols . . . . . . . . . . . . . 28
11.6. Impact On Network Operations . . . . . . . . . . . . . . 28
12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 28
12.1. Measurement Capability TLV Types . . . . . . . . . . . . 28
12.1.1. Flag Fields for MEASUREMENT-CAPABILITY TLVs . . . . . 28
12.2. MEASUREMENT-ATTRIBUTES TLVs . . . . . . . . . . . . . . . 29
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12.2.1. The Sub-TLVs For MEASUREMENT-ATTRIBUTES TLVs . . . . 29
12.2.1.1. Flag Fields in Measurement-Enable sub-TLV . . . . 30
12.3. Measurement Object-Class . . . . . . . . . . . . . . . . 30
12.3.1. DELAY-MEASUREMENT Object-Types . . . . . . . . . . . 31
12.3.2. LOSS-MEASUREMENT Object-Types . . . . . . . . . . . . 31
12.3.3. BANDWIDTH Object-Type . . . . . . . . . . . . . . . . 31
12.4. PCE Error Codes . . . . . . . . . . . . . . . . . . . . . 31
12.5. Notification Object-Type . . . . . . . . . . . . . . . . 32
13. References . . . . . . . . . . . . . . . . . . . . . . . . . 33
13.1. Normative References . . . . . . . . . . . . . . . . . . 33
13.2. Informative References . . . . . . . . . . . . . . . . . 33
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 35
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 35
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1. Introduction
[RFC5440] describes the Path Computation Element Protocol (PCEP) as a
communication mechanism between a Path Computation Client (PCC) and a
Path Control Element (PCE), or between PCE and PCE, that enables
computation of Multi-Protocol Label Switching (MPLS) Traffic
Engineering Label Switched Paths (TE LSPs).
[DRAFT-PCE-STATEFUL] specifies extensions to PCEP to enable Stateful
control of TE LSPs. It describes two mode of operations - Passive
Stateful PCE and Active Stateful PCE. Further [DRAFT-PCE-INITIATED-
LSP] describes the setup, maintenance and teardown of PCE-Initiated
LSPs for the Stateful PCE model. In this document, the focus is on
Active Stateful PCE where the LSPs are controlled by the PCE, for
both PCE-Initiated and PCC-Initiated LSPs.
In certain networks, such as financial information networks, network
performance data (e.g. packet loss, delay and delay variation
(jitter), bandwidth utilization) is a critical measure for traffic
engineering. The protocol extensions have been defined to advertise
link performance metrics, see [RFC7471], [RFC7810], [RFC7823] and
[DRAFT-IDR-TE-PM-BGP]. This data provides operators the
characteristics of their networks for performance evaluation that is
required to ensure the Service Level Agreements (SLAs).
[DRAFT-PCE-SERVICE-AWARE] defines the PCEP extensions for TE LSP path
computation using packet loss, delay and delay variation as path
selection metrics. Such path computations use link metrics for
packet loss and delay and do not provide end-to-end metrics of the TE
LSPs. The end-to-end metrics of a TE LSP may be very different than
the path computation results due to many factors, such as queuing,
etc. There is a need to verify and monitor that the traffic sent
over the established TE LSPs does not exceed the requested metric
bounds (e.g. total end-to-end delay/loss). The Stateful PCE may need
to take some action (such as tear-down or re-optimize the LSP) when
the performance requirement is not met. [RFC6374], [RFC6375] and
[RFC7876] define protocol extensions needed for measuring end-to-end
packet loss, delay and delay variation (jitter) for bidirectional and
unidirectional TE LSPs.
This document provides mechanisms to report the performance
measurements (PM) such as packet loss, delay, delay variation
(jitter) and bandwidth utilization for a TE LSP to an Active Stateful
PCE, for both PCE-Initiated and PCC-Initiated LSPs.
1.1. Dependencies and Considerations
[RFC6374] describes several reasons why PMs are valuable to
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operators. Note that the specification of the use of the reported
packet loss, delay, delay variation and bandwidth utilization
measurements by a Stateful PCE is outside the scope of this document.
Furthermore, [RFC6374] describes many types of MPLS channels that may
leverage PMs and some may have bidirectional dependencies. Defining
a mechanism for the verification and/or provisioning of bidirectional
or associated bidirectional LSPs within the Stateful PCE architecture
is outside the scope of this document.
In all cases, delay and loss PM messages are carried over the MPLS
Generic Associated Channel (G-ACh) as described in [RFC5586]. MPLS
LSPs that carry the G-ACh can be referred to as MPLS Transport
Profile (MPLS-TP) LSPs [RFC5921]. MPLS-TP LSPs require Ultimate Hop
Popping (UHP). It is beyond the scope of this document to define the
mechanism by which a Stateful PCE verifies and/or provisions an LSP
for UHP. Note that for both unidirectional and bidirectional LSPs,
packet loss measurement requires UHP.
1.2. Auto-bandwidth Considerations
Auto-Bandwidth feature allows a head-end LSR (PCC) to automatically
adjust the LSP bandwidth reservation based on the traffic demand of a
TE LSP. Auto-bandwidth requested bandwidth computation can be
implemented on a PCC or a Stateful PCE.
[DRAFT-IETF-PCE-AUTOBW] describes the PCEP extensions for auto-
bandwidth, where the requested bandwidth for the LSP is computed by
the PCC and reported to the Stateful PCE. There is a benefit in
pushing the responsibility for deciding when auto-bandwidth
adjustments are needed to the PCC as this distributes the load of
monitoring the bandwidth utilization of the LSPs down to the PCCs and
frees up the PCE for path computations. In addition, it reduces the
load on PCEP communications for reporting the bandwidth utilization
of the LSP.
However, exactly when to adjust an LSP bandwidth could be better left
to a Stateful PCE. That is, a PCE could be flexible in its
interpretation of thresholds enabling it to trigger auto-bandwidth
adjustment early if it believes there is a good reason (for example,
doing a set of parallel path re-computations) or late (for example,
when it knows that an adjustment would be disruptive to the network).
When the auto-bandwidth computation is delegated to the PCC, the PCC
cannot see the impact on other LSPs in the network, and the PCE
cannot tell whether the request to adjust the LSP bandwidth is
critical or not. The bandwidth utilization reporting defined in this
document can be used by the PCE to do computations to determine
whether auto-bandwidth adjustments are needed and/or desirable before
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performing the path computations.
2. Conventions Used in This Document
2.1. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
2.2. Terminology
The reader is assumed to be familiar with the terminology defined in
[RFC5440], [RFC6374] and [RFC7471].
2.3. Measurement Units
The measurement unit for delay value is defined in [RFC7471], Section
4.1.5.
The measurement unit for loss value is defined in [RFC7471], Section
4.4.5.
The utilized bandwidth [RFC7471] is encoded in IEEE floating point
format in bytes per second (see [IEEE.754.1985]).
All average values are calculated as rolling averages.
3. Overview of the PCEP Extensions
The high-level overview of the PCEP extensions defined in this
document for requesting and reporting end-to-end performance
measurements and bandwidth utilization for TE LSPs are shown in
Figure 1.
---------
| |
| PCE |
| |
---------
| ^
MEASUREMENT CAPABILITY | | MEASUREMENT CAPABILITY
| |
MEASUREMENT ATTRIBUTES | | MEASUREMENT ATTRIBUTES
| | (For delegated LSPs)
| |
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| | MEASUREMENT REPORTS
v |
---------
| |
| PCC |
| |
---------
Figure 1: Overview of PCEP Extensions
The following steps describe the PCEP extensions for reporting
performance measurements and bandwidth utilization of TE LSPs:
o The Stateful PCE and PCC (head-end of the LSP) advertise the
capability of their support for the delay, loss and bandwidth-
utilization measurements and reporting in the PCEP Open message
(in the OPEN Object).
o The Stateful PCE enables the measurement of a feature and sends
and updates the configuration parameters of the feature using the
LSPA object to PCC in PCInitiate and PCUpd messages respectively.
o The PCC reports the measured values of the feature to the Stateful
PCE at the end of the specified report-interval or when measured
values cross the specified report-threshold. The periodic
reporting can be used at the PCE to monitor the TE LSP metrics
whereas report-threshold can be used to trigger an immediate
action at the PCE on the TE LSP.
o The PCE and PCC notify each other of their entering and clearing
the overwhelmed state when operating under high LSP scale.
3.1. Report Thresholds
When explicitly configured, report threshold (absolute or percentage)
parameter (along with the configured number of counts) is used to
trigger an immediate reporting of the delay and loss measurements and
bandwidth utilization, bypassing the report interval. Threshold is
used to detect a sudden change in the performance measurement metric
of a TE LSP. In order to detect that a measured value has crossed
the threshold, the (delay/loss) metric is compared from the last
reported interval and the current interval. If the change (increase
or decrease) in the value is above the threshold (absolute or
percentage) consecutively for the given number of counts, the
measurement from the current interval is reported immediately. In
case of bandwidth utilization, the MaxSampleBw (see [DRAFT-IETF-PCE-
AUTOBW]) from the last reported interval is compared with the
MaxSampleBW from the the current interval to detect the threshold
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crossing. The delay and loss measurements are still reported at the
end of the report interval even if they were reported due to the
crossing of the threshold. Refer to [RFC7471], Section 5, for
additional considerations.
4. Sub-TLVs for Measurements Attributes
This section specifies the generic sub-TLVs those provide various
configurable parameters for reporting measurements to a Stateful PCE.
These sub-TLVs are carried in various measurement attributes TLVs
defined in this document.
Following sub-TLVs are defined:
Type Len Name
-----------------------------------------------------------------
1 4 Measurement-Enable sub-TLV
2 4 Measurement-Interval sub-TLV
3 8 Report-Threshold sub-TLV
4 4 Report-Threshold-Percentage sub-TLV
5 4 Report-Interval sub-TLV
The Measurement-Enable sub-TLV MUST be added in the LSPA Object when
the measurement feature is enabled for the LSP. All other sub-TLVs
are optional and any unrecognized sub-TLV MUST be silently ignored.
If a sub-TLV of same type appears more than once, only the first
occurrence is processed and all others MUST be ignored. If sub-TLVs
are not present, the default values based on the local policy are
assumed.
4.1. Measurement-Enable sub-TLV
The Measurement-Enable sub-TLV specifies that the given measurement
feature is enabled.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=1 | Length=4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Measurement-Enable sub-TLV Format
The Type is 1, Length is 4 bytes, and the value comprises of flags
(32 bits) for enabling various measurement features.
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Unassigned flags are considered reserved, they MUST be set to 0 when
sent and MUST be ignored when received.
4.2. Measurement-Interval sub-TLV
The Measurement-Interval sub-TLV specifies a time interval in seconds
for the measurement.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=2 | Length=4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Measurement-Interval |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Measurement-Interval sub-TLV Format
The Type is 2, Length is 4 bytes, and the value comprises of 4-byte
time interval, the valid range is from 1 to 604800, in seconds. The
default value is 300 seconds.
4.3. Report-Threshold sub-TLV
The Report-Threshold sub-TLV specifies the threshold value used to
trigger an immediate reporting of the measurements bypassing the
report-interval.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=3 | Length=8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Count |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Report-Threshold |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Report-Threshold sub-TLV Format
The Type is 3, Length is 8 bytes, and the value comprises of -
o Report-Threshold: 32-bit absolute threshold value.
o Count: 8-bit integer counter. The number of consecutive
measurement values MUST be above the threshold before reporting
the measurement. The value 0 is considered to be invalid.
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o RESERVED: It MUST be set to zero when sent and MUST be ignored
when received.
4.4. Report-Threshold-Percentage sub-TLV
The Report-Threshold-Percentage sub-TLV specifies the threshold value
used to trigger an immediate reporting of the measurements bypassing
the report-interval.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=4 | Length=4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Percentage | RESERVED | Count |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Report-Threshold-Percentage sub-TLV Format
The Type is 4, Length is 4 bytes, and the value comprises of -
o Percentage: 7-bit threshold value, encoded in percentage (an
integer from 0 to 100).
o Count: 8-bit integer counter. The number of consecutive
measurement values MUST be above threshold before reporting the
measurement. The value 0 is considered to be invalid.
o RESERVED: It MUST be set to zero when sent and MUST be ignored
when received.
4.5. Report-Interval sub-TLV
The Report-Interval sub-TLV specifies the time interval in seconds
when measured values are to be reported.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=5 | Length=4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Report-Interval |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Report-Interval sub-TLV Format
The Type is 5, Length is 4 bytes, and the value comprises of 4-byte
time interval, the valid range is from 1 to 604800, in seconds. The
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default value is 3600 seconds.
5. PCEP Extensions for Reporting Delay Measurement
5.1. Delay Measurement Capability Advertisement
During PCEP Initialization Phase, PCEP Speakers (PCE or PCC)
advertise their support of DELAY-MEASUREMENT. A PCEP Speaker (PCE or
PCC) includes the DELAY-MEASUREMENT-CAPABILITY TLV, in the OPEN
Object to advertise its support for PCEP Delay-Measurement
extensions. The presence of the DELAY-MEASUREMENT-CAPABILITY TLV in
the OPEN Object (in the Open message) indicates that the Delay
Measurement capability is supported as described in this document.
Additional procedure is defined as following:
o The PCEP protocol extensions for Delay Measurement MUST NOT be
used if one or both PCEP Speakers have not included the DELAY-
MEASUREMENT-CAPABILITY TLV in their respective Open message.
o If the PCEP speaker that supports the extensions of this document
but did not advertise this capability, then upon receipt of DELAY-
MEASUREMENT-ATTRIBUTES TLV in LSPA object, it SHOULD generate a
PCErr with error-type 19 (Invalid Operation), error-value TBD7
(Delay-Measurement capability was not advertised) and it will
terminate the PCEP session.
o Similarly, the PCEP speaker SHOULD generate error-value TBD9
(Bidirectional Measurement capability was not advertised) and
TBD10 (Unidirectional Measurement capability was not advertised)
upon receipt of DELAY-MEASUREMENT-ATTRIBUTES TLV in LSPA object
with two-way measurement request and one-way measurement request,
respectively, when it did not advertise this capability.
o If the PCEP speaker that supports the extensions of this document
but did not advertise this capability, then upon receipt of DELAY-
MEASUREMENT object, it SHOULD generate a PCErr with error-type 19
(Invalid Operation), error-value TBD7 (Delay-Measurement
capability was not advertised) and it will terminate the PCEP
session.
5.1.1. DELAY-MEASUREMENT-CAPABILITY TLV
The DELAY-MEASUREMENT-CAPABILITY TLV is an optional TLV for use in
the OPEN Object for Delay Measurement via PCEP capability
advertisement. Its format is shown in the following figure:
0 1 2 3
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=TBD1 | Length=4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags |B|U|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
DELAY-MEASUREMENT-CAPABILITY TLV Format
The Type of the TLV is TBD1 and it has a fixed length of 4 bytes.
The value comprises a single field - Flags (32 bits):
o U (Unidirectional Delay Measurement - 1 bit): if set to 1 by a
PCC, the U Flag indicates that the PCC allows reporting of
unidirectional delay measurement information; if set to 1 by a
PCE, the U Flag indicates that the PCE is capable of receiving
unidirectional delay measurement information from the PCC.
o B (Bidirectional Delay Measurement - 1 bit): if set to 1 by a PCC,
the B Flag indicates that the PCC allows reporting of
bidirectional delay measurement information; if set to 1 by a PCE,
the B Flag indicates that the PCE is capable of receiving
bidirectional delay measurement information from the PCC.
Bidirectional measurement is only applicable to the bidirectional
LSPs (e.g. MPLS-TP LSPs [RFC5921]).
Unassigned bits are considered reserved. They MUST be set to 0 when
sent and MUST be ignored when received.
Advertisement of the DELAY-MEASUREMENT-CAPABILITY TLV implies support
of delay measurement, as well as the objects, TLVs and procedures
defined in this document. Either U or B flag MUST be set in the TLV.
5.2. DELAY-MEASUREMENT-ATTRIBUTES TLV
The DELAY-MEASUREMENT-ATTRIBUTES TLV provides the configurable
parameters of the delay measurement feature.
The format of the DELAY-MEASUREMENT-ATTRIBUTES TLV is shown in the
following figure:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PCEP TLV Type TBD4 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
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// sub-TLVs //
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
DELAY-MEASUREMENT-ATTRIBUTES TLV Format
PCEP TLV Type is defined as following:
Type Name
----------------------------------------------------------
TBD4 DELAY-MEASUREMENT-ATTRIBUTES
Length: The Length field defines the length of the value portion in
bytes as per [RFC5440].
Value: Comprises of one or more sub-TLVs as described in Section 4 of
this document.
The following sub-sections describe the parameters which are
currently defined to be carried within this TLV.
5.2.1. Delay Measurement Enable
The Measurement-Enable sub-TLV specifies the delay measurement mode
enabled using following flags:
Bit Description
------------------------------------------------------------------
31 One-Way Delay Measurement Enabled
30 Two-Way Delay Measurement Enabled
5.2.2. Delay Measurement Interval
The Measurement-Interval sub-TLV specifies a time interval in seconds
for the delay measurement.
5.2.3. Delay Measurement Report Threshold
The Report-Threshold sub-TLV specifies the threshold value used to
trigger an immediate reporting of the delay measurements bypassing
the report-interval.
o Report-Threshold: Delay in microseconds, encoded as 24-bit
integer, as defined in [RFC7471].
Same report-threshold is used for all delay measurement values.
5.2.4. Delay Measurement Report Threshold Percentage
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The Report-Threshold-Percentage sub-TLV specifies the threshold value
used to trigger an immediate reporting of the measurements bypassing
the report-interval.
Same report-threshold-percentage is used for all delay measurement
values.
5.2.5. Delay Measurement Report Interval
The Report-Interval sub-TLV specifies the time interval in seconds
when measured delay values are to be reported.
5.3. DELAY-MEASUREMENT Object
A new object, DELAY-MEASUREMENT with Object-Class (Value TBD5) is
defined in this document to report the delay measurement of a TE LSP.
When the LSP is enabled with the delay measurement feature, the PCC
SHOULD include the DELAY-MEASUREMENT Object to report the measured
delay values to the PCE in the PCRpt message. The PCC SHOULD report
(either one-way or two-way) average delay, min/max delay and delay
variations to the PCE in the PCRpt message.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Class=TBD5 | OT |Res|P|I| Object Length (bytes) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
// (Object body) //
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
DELAY-MEASUREMENT Object Format
Object Length (16 bits): Specifies the total object length including
the header, in bytes as per [RFC5440].
Object-Types (OT) are defined as follows:
Object-Type Len Name
--------------------------------------------------------------
1 8 One-Way Delay Measurement Value
2 12 One-Way Delay Measurement Min/Max Values
3 8 One-Way Delay Variation Measurement Value
4 8 Two-Way Delay Measurement Value
5 12 Two-Way Delay Measurement Min/Max Values
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6 8 Two-Way Delay Variation Measurement Value
The object body formats are defined as following:
For Object-Type 1 and 4:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Delay Value Average |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
For Object-Type 2 and 5:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Delay Value Minimum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Delay Value Maximum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
For Object-Type 3 and 6:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Delay Variation Value |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
DELAY-MEASUREMENT Object Body Formats (One-Way and Two-Way)
Al delay values are reported in microseconds, encoded as 24-bit
integer, as defined in [RFC7471]. When set to the maximum value
16,777,215 (16.777215 sec), the delay is at least that value and may
be larger.
o One-way Delay Measurement Value: Average Delay of the LSP in one
(forward) direction.
o One-way Delay Measurement Variation Value: Average Delay Variation
of the LSP in one (forward) direction.
o One-Way Delay Measurement Value Minimum/Maximum: Minimum and
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Maximum values of the Delay of the LSP in one (forward) direction
in the last measurement interval.
o Two-way Delay Measurement Value: Average Delay of the
bidirectional LSP in both (forward and reverse) directions.
o Two-way Delay Measurement Variation Value: Average Delay Variation
of the bidirectional LSP in both (forward and reverse)
directions.
o Two-Way Delay Measurement Value Minimum/Maximum: Minimum and
Maximum values of the Delay of the bidirectional LSP in both
(forward and reverse) directions in the last measurement interval.
o RESERVED: This field is reserved for future use. It MUST be set
to 0 when sent and MUST be ignored when received.
6. PCEP Extensions for Reporting Loss Measurement
6.1. Loss Measurement Capability Advertisement
During PCEP Initialization Phase, PCEP Speakers (PCE or PCC)
advertise their support of LOSS-MEASUREMENT. A PCEP Speaker includes
the LOSS-MEASUREMENT-CAPABILITY TLV, in the OPEN Object to advertise
its support for PCEP Loss-Measurement extensions. The presence of
the LOSS-MEASUREMENT-CAPABILITY TLV in the OPEN Object (in the Open
message) indicates that the Loss Measurement capability is supported
as described in this document. Additional procedure is defined as
following:
o The PCEP protocol extensions for Loss Measurement MUST NOT be used
if one or both PCEP Speakers have not included the LOSS-
MEASUREMENT-CAPABILITY TLV in their respective Open message.
o If the PCEP speaker that supports the extensions of this document
but did not advertise this capability, then upon receipt of LOSS-
MEASUREMENT-ATTRIBUTES TLV in LSPA object, it SHOULD generate a
PCErr with error-type 19 (Invalid Operation), error-value TBD8
(Loss-Measurement capability was not advertised) and it will
terminate the PCEP session.
o Similarly, the PCEP speaker SHOULD generate error-value TBD9
(Bidirectional Measurement capability was not advertised) and
TBD10 (Unidirectional Measurement capability was not advertised)
upon receipt of LOSS-MEASUREMENT-ATTRIBUTES TLV in LSPA object
with two-way measurement request and one-way measurement request,
respectively, when it did not advertise this capability.
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o Further, the PCEP speaker SHOULD generate error-value TBD11
(Inferred Mode Loss Measurement capability was not advertised) and
TBD12 (Direct Mode Loss Measurement capability was not advertised)
upon receipt of LOSS-MEASUREMENT-ATTRIBUTES TLV in LSPA object
with Inferred Mode loss measurement request and Direct Mode loss
measurement request, respectively, when it did not advertise this
capability.
o If the PCEP speaker that supports the extensions of this document
but did not advertise this capability, then upon receipt of LOSS-
MEASUREMENT object, it SHOULD generate a PCErr with error-type 19
(Invalid Operation), error-value TBD8 (Loss-Measurement capability
was not advertised) and it will terminate the PCEP session.
6.1.1. LOSS-MEASUREMENT-CAPABILITY TLV
The LOSS-MEASUREMENT-CAPABILITY TLV is an optional TLV for use in the
OPEN Object for Loss Measurement via PCEP capability advertisement.
Its format is shown in the following figure:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=TBD2 | Length=4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags |N|I|B|U|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
LOSS-MEASUREMENT-CAPABILITY TLV Format
The Type of the TLV is TBD2 and it has a fixed length of 4 bytes.
The value comprises a single field - Flags (32 bits):
o U (Unidirectional Measurement - 1 bit): if set to 1 by a PCC, the
U Flag indicates that the PCC allows reporting of unidirectional
loss measurement information; if set to 1 by a PCE, the U Flag
indicates that the PCE is capable of receiving unidirectional loss
measurement information from the PCC.
o B (Bidirectional Measurement - 1 bit): if set to 1 by a PCC, the B
Flag indicates that the PCC allows reporting of bidirectional loss
measurement information; if set to 1 by a PCE, the B Flag
indicates that the PCE is capable of receiving bidirectional loss
measurement information from the PCC. Bidirectional measurement
is only applicable to the bidirectional LSPs (e.g. MPLS-TP LSPs
[RFC5921]).
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o I (Inferred Loss Measurement Mode - 1 bit): if set to 1 by a PCC,
the I Flag indicates that the PCC allows reporting of inferred
mode loss measurement [RFC6374] information; if set to 1 by a PCE,
the I Flag indicates that the PCE is capable of receiving inferred
mode loss measurement information from the PCC.
o N (Direct Loss Measurement Mode - 1 bit): if set to 1 by a PCC,
the N Flag indicates that the PCC allows reporting of direct mode
loss measurement [RFC6374] information; if set to 1 by a PCE, the
N Flag indicates that the PCE is capable of receiving direct mode
loss measurement information from the PCC.
Unassigned bits are considered reserved. They MUST be set to 0 when
sent and MUST be ignored when received.
Advertisement of the LOSS-MEASUREMENT-CAPABILITY TLV implies support
of loss measurement, as well as the objects, TLVs and procedures
defined in this document. Either U or B flag MUST be set in the TLV.
Similarly, either I or N flag MUST be set in the TLV.
6.2. LOSS-MEASUREMENT-ATTRIBUTES TLV
The LOSS-MEASUREMENT-ATTRIBUTES TLV provides the configurable
parameters of the loss measurement feature.
The format of the LOSS-MEASUREMENT-ATTRIBUTES TLV is shown in the
following figure:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PCEP TLV Type TBD16 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
// sub-TLVs //
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
LOSS-MEASUREMENT-ATTRIBUTES TLV Format
PCEP TLV Type is defined as following:
Type Name
----------------------------------------------------------
TBD16 LOSS-MEASUREMENT-ATTRIBUTES
Length: The Length field defines the length of the value portion in
bytes as per [RFC5440].
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Value: Comprises of one or more sub-TLVs as described in Section 4 of
this document.
The following sub-sections describe the parameters which are
currently defined to be carried within this TLV.
6.2.1. Loss Measurement Enable
The Measurement-Enable sub-TLV specifies the loss measurement mode
enabled using following flags:
Bit Description
------------------------------------------------------------------
29 Unidirectional Loss Measurement Enabled
28 Bidirectional Loss Measurement Enabled
27 Inferred Loss Measurement Enabled
6.2.2. Loss Measurement Interval
The Measurement-Interval sub-TLV specifies a time interval in seconds
for the loss measurement.
6.2.3. Loss Measurement Report Threshold
The Report-Threshold sub-TLV specifies the threshold value used to
trigger an immediate reporting of the loss measurements bypassing the
report-interval.
o Report-Threshold: This 24-bit field identifying the packet loss as
a percentage of the total packets sent or received. The encoding
is as per [RFC7471].
Same report-threshold is used for all loss measurement values.
6.2.4. Loss Measurement Report Threshold Percentage
The Report-Threshold-Percentage sub-TLV specifies the threshold value
used to trigger an immediate reporting of the loss measurements
bypassing the report-interval.
Same report-threshold-percentage is used for all loss measurement
values.
6.2.5. Loss Measurement Report Interval
The Report-Interval sub-TLV specifies the time interval in seconds
when measured loss values are to be reported.
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6.3. LOSS-MEASUREMENT Object
The LOSS-MEASUREMENT Object with Object-Class (Value TBD6) is defined
in this document to report the packet loss measurement of a TE LSP.
When the LSP is enabled with the loss measurement feature, the PCC
SHOULD include the LOSS-MEASUREMENT Object to report the measured
packet loss to the PCE in the PCRpt message.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Class=TBD6 | OT |Res|P|I| Object Length (bytes) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
// (Object body) //
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
LOSS-MEASUREMENT Object Format
Object Length (16 bits): Specifies the total object length including
the header, in bytes [RFC5440].
Object-Types (OT) are defined as following:
Object-Type Len Name
--------------------------------------------------------------
1 8 Tx Packets-Lost
2 8 Rx Packets-Lost
The object body format is defined as following:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Packets-Lost |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
LOSS-MEASUREMENT Object Body Formats (Tx and Rx)
o Packets-Lost: This 24-bit field identifying the packet loss as a
percentage of the total packets sent or received, encoded as per
[RFC7471].
o RESERVED: This field is reserved for future use. It MUST be set
to 0 when sent and MUST be ignored when received.
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The Packets-Lost in the Rx direction is reported when bidirectional
loss measurement is enabled.
7. PCEP Extensions for Reporting Bandwidth Utilization
7.1. Bandwidth Utilization Capability Advertisement
During PCEP Initialization Phase, PCEP Speakers (PCE or PCC)
advertise their support of bandwidth utilization reporting. A PCEP
Speaker includes the "BANDWIDTH-UTILIZATION-CAPABILITY" TLV, in the
OPEN Object to advertise its support for PCEP extension. The
presence of the "BANDWIDTH-UTILIZATION-CAPABILITY" TLV in the OPEN
Object (in the Open message) indicates that the bandwidth utilization
reporting is supported as described in this document. Additional
procedure is defined as following:
o The PCEP protocol extensions for bandwidth utilization MUST NOT be
used if one or both PCEP Speakers have not included the
"BANDWIDTH-UTILIZATION-CAPABILITY" TLV in their respective Open
message.
o If the PCEP speaker that supports the extensions of this document
but did not advertise this capability, then upon receipt of
BANDWIDTH-UTILIZATION-ATTRIBUTES TLV in LSPA object, it SHOULD
generate a PCErr with error-type 19 (Invalid Operation), error-
value TBD13 (Bandwidth utilization capability was not advertised)
and it will terminate the PCEP session.
o If the PCEP speaker that supports the extensions of this document
but did not advertise this capability, then upon receipt of
BANDWIDTH object of type TBD14, it SHOULD generate a PCErr with
error-type 19 (Invalid Operation), error-value TBD13 (Bandwidth
utilization capability was not advertised) and it will terminate
the PCEP session.
7.1.1. BANDWIDTH-UTILIZATION-CAPABILITY TLV
The BANDWIDTH-UTILIZATION-CAPABILITY TLV is an optional TLV for use
in the OPEN Object for Bandwidth Utilization reporting via PCEP
capability advertisement. Its format is shown in the following
figure:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=TBD3 | Length=4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Flags |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
BANDWIDTH-UTILIZATION-CAPABILITY TLV Format
The Type of the TLV is TBD3 and it has a fixed length of 4 bytes.
The value comprises a single field - Flags (32 bits). Currently no
flags are defined for this TLV.
Unassigned bits are considered reserved. They MUST be set to 0 when
sent and MUST be ignored when received.
Advertisement of the BANDWIDTH-UTILIZATION-CAPABILITY TLV implies
support of bandwidth utilization reporting, as well as the objects,
TLVs and procedures defined in this document.
7.2. BW-UTILIZATION-MEASUREMENT-ATTRIBUTES TLV
The BW-UTILIZATION-MEASUREMENT-ATTRIBUTES TLV provides the
configurable parameters of bandwidth utilization feature.
The format of the BW-UTILIZATION-MEASUREMENT-ATTRIBUTES TLV is shown
in the following figure:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PCEP TLV Type TBD17 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
// sub-TLVs //
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
BW-UTILIZATION-MEASUREMENT-ATTRIBUTES TLV Format
PCEP TLV Type is defined as following:
Type Name
----------------------------------------------------------
TBD17 BW-UTILIZATION-MEASUREMENT-ATTRIBUTES
Length: The Length field defines the length of the value portion in
bytes as per [RFC5440].
Value: Comprises of one or more sub-TLVs as described in Section 4 of
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this document.
The following sub-sections describe the parameters which are
currently defined to be carried within this TLV.
7.2.1. Bandwidth Utilization Measurement Enable
The Measurement-Enable sub-TLV specifies that the bandwidth
utilization reporting is enabled using following flag:
Bit Description
------------------------------------------------------------------
26 Bandwidth Utilization Reporting Enabled
7.2.2. Bandwidth Utilization Measurement Interval
The Measurement-Interval sub-TLV specifies a time interval in seconds
for the bandwidth samples collection interval.
7.2.3. Bandwidth Utilization Report Threshold
The Report-Threshold sub-TLV is used to decide if the bandwidth
samples collected so far should be immediately reported bypassing the
report-interval.
o Threshold: The absolute threshold bandwidth value in 32-bits,
encoded in IEEE floating point format (see [IEEE.754.1985]),
expressed in bytes per second.
7.2.4. Bandwidth Utilization Report Threshold Percentage
The Report-Threshold-Percentage sub-TLV is used to decide if the
bandwidth samples collected so far should be immediately reported
bypassing the report-interval.
7.2.5. Bandwidth Utilization Report Interval
The Report-Interval sub-TLV specifies a time interval in seconds when
the collected bandwidth samples are to be reported to PCE.
7.3. BANDWIDTH Object
A new object-type for BANDWIDTH object (Object-Class 5) is defined to
report the bandwidth utilization of a TE LSP.
When the TE LSP is enabled with the bandwidth utilization reporting,
the PCC SHOULD include the BANDWIDTH-UTILIZATION Object to report the
bandwidth utilization of the TE LSP to the PCE in the PCRpt message.
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The object-type is TBD14, the object length is variable with
multiples of 4 bytes.
The object body format is defined as following:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| BwSample1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| BwSampleN |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
BANDWIDTH-UTILIZATION Object Body Format
o BwSample: The utilized bandwidth, (the BwSample collected at the
end of each measurement-interval) encoded in IEEE floating point
format (see [IEEE.754.1985]), expressed in bytes per second.
8. PCEP Procedure
Following procedure is defined for the extensions to different PCEP
messages for reporting performance measurements.
8.1. Various MEASUREMENT-ATTRIBUTES TLVs
o For a PCE-Initiated LSP [DRAFT-PCE-INITIATED-LSP] with reporting
features enabled, the corresponding MEASUREMENT-ATTRIBUTES TLV for
each measurement MUST be included in the LSPA Object with the
PCInitiate message.
o For a PCE-Initiated LSP [DRAFT-PCE-INITIATED-LSP] with reporting
features enabled, the corresponding MEASUREMENT-ATTRIBUTES TLV for
each measurement is carried in the PCUpd message in the LSPA
Object in order to make updates to the attributes such as
Report-Interval.
o For a PCC-Initiated LSP with reporting features enabled, when the
LSP is delegated to the PCE, the corresponding MEASUREMENT-
ATTRIBUTES TLV for each measurement MUST be included in the LSPA
Object of the PCRpt message.
o The various MEASUREMENT-ATTRIBUTES TLVs are encoded in all PCEP
messages for the LSP with reporting features enabled, the absence
of the corresponding MEASUREMENT-ATTRIBUTES TLV indicates that the
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PCEP speaker wishes to disable the feature.
8.2. The MEASUREMENT Objects
When a TE LSP is enabled with a measurement reporting feature, the
PCC SHOULD include the corresponding MEASUREMENT Object to report the
measured values to the PCE in the PCRpt message [DRAFT-PCE-
STATEFUL].
The format of the "actual_attribute-list" in the PCRpt message is
modified as following:
<actual_attribute-list>::=[<BANDWIDTH>]
[<DELAY-MEASUREMENT>]
[<LOSS-MEASUREMENT>]
[<metric-list>]
9. Scaling Considerations
It should be noted that when measurement reporting is deployed under
LSP scale, it can lead to frequent reporting updates to the PCE.
Operators are advised to set the values of various measurement
reporting parameters appropriate for the deployed LSP scale.
If a PCE gets overwhelmed, it can notify the PCC to temporarily
suspend the reporting of the measurements as described below.
9.1. The PCNtf Message
As per [RFC5440], the PCEP Notification message (PCNtf) can be sent
by a PCEP speaker to notify its peer of a specific event. A PCEP
speaker SHOULD notify its PCEP peer that it is overwhelmed, and on
receipt of such notification the peer SHOULD NOT send any PCEP
messages related to measurement reporting. If a PCEP message related
to measurement reporting is received, it MUST be silently ignored.
o When a PCEP speaker is overwhelmed, it SHOULD notify its peer by
sending a PCNtf message with Notification Type = TBD15 (PM
Overwhelm State) and Notification Value = 1 (Entering PM overwhelm
state).
o Optionally, OVERLOADED-DURATION TLV [RFC5440] MAY be included that
specifies the time period during which no further PCEP messages
related to PM should be sent.
o When the PCEP speaker is no longer in the overwhelm state and is
available to process the PM reporting, it SHOULD notify its peer
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by sending a PCNtf message with Notification Type = TBD15 (PM
Overwhelm State) and Notification Value = 2 (Clearing PM overwhelm
state).
10. Security Considerations
This document defines new MEASUREMENT-ATTRIBUTES TLVs, CAPABILITY
TLVs and MEASUREMENT Objects for reporting loss, delay measurements
and bandwidth utilization which do not add additional security
concerns beyond those discussed in [RFC5440] and
[DRAFT-PCE-STATEFUL].
Some deployments may find the reporting of the performance
measurement and bandwidth utilization information as extra sensitive
as it could be used to influence LSP path computation and LSP setup
with adverse effect. Additionally, snooping of PCEP messages with
such data or using PCEP messages for network reconnaissance, may give
an attacker sensitive information about the operations of the
network. Thus, such deployment should employ suitable PCEP security
mechanisms like TCP Authentication Option (TCP-AO) [RFC5925] or
[DRAFT-PCE-PCEPS].
11. Manageability Considerations
11.1. Control of Function and Policy
The performance measurement reporting SHOULD be controlled per TE
tunnel (at PCC or PCE) and the values for feature attributes e.g.
measurement-interval, report-interval, report-threshold SHOULD be
configurable by an operator.
11.2. Information and Data Models
A Management Information Base (MIB) module for modeling PCEP is
described in [RFC7420]. However, one may prefer the mechanism for
configuration using YANG data model [DRAFT-PCE-PCEP-YANG]. These
SHOULD be enhanced to provide controls and indicators for support of
performance measurement reporting feature. Support for various
configuration knobs as well as counters of messages sent/received
containing the TLVs (defined in this document) SHOULD be added.
11.3. Liveness Detection and Monitoring
Mechanisms defined in this document do not imply any new liveness
detection and monitoring requirements in addition to those already
listed in [RFC5440].
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11.4. Verify Correct Operations
Mechanisms defined in this document do not imply any new operation
verification requirements in addition to those already listed in
[RFC5440].
11.5. Requirements On Other Protocols
Mechanisms defined in this document do not add any new requirements
on other protocols.
11.6. Impact On Network Operations
In order to avoid any unacceptable impact on network operations, an
implementation SHOULD allow a limit to be placed on the number of
LSPs that can be enabled with performance measurement reporting
feature. An implementation MAY allow a limit to be placed on the
rate of measurement reporting messages sent by a PCEP speaker and
received by a peer. An implementation MAY also allow sending a
notification when a PCEP speaker is overwhelmed or the rate of
messages reach a threshold.
12. IANA Considerations
12.1. Measurement Capability TLV Types
This document defines the following new PCEP TLVs; IANA is requested
to make the following allocations from the "PCEP TLV Type Indicators"
registry. <http://www.iana.org/assignments/pcep/pcep.xhtml#pcep-tlv-
type-indicators>
Type Name Reference
----------------------------------------------------------
TBD1 DELAY-MEASUREMENT-CAPABILITY [This I.D.]
TBD2 LOSS-MEASUREMENT-CAPABILITY [This I.D.]
TBD3 BANDWIDTH-UTILIZATION-CAPABILITY [This I.D.]
12.1.1. Flag Fields for MEASUREMENT-CAPABILITY TLVs
IANA is requested to create a registry to manage the Flag field of
the DELAY-MEASUREMENT-CAPABILITY TLV, LOSS-MEASUREMENT-CAPABILITY TLV
and BANDWIDTH-UTILIZATION-CAPABILITY TLV.
New bit numbers are allocated only by an IETF Review action
[RFC5226]. Each bit should be tracked with the following qualities:
o Bit number (counting from bit 0 as the most significant bit)
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o Capability description
o Defining RFC
The following value are defined in this document for the Flag field
for -
DELAY-MEASUREMENT-CAPABILITY TLV:
Bit Description Reference
------------------------------------------------------------
31 Unidirectional Delay Measurement [This I.D.]
30 Bidirectional Delay Measurement [This I.D.]
LOSS-MEASUREMENT-CAPABILITY TLV:
Bit Description Reference
------------------------------------------------------------
31 Unidirectional Loss Measurement [This I.D.]
30 Bidirectional Loss Measurement [This I.D.]
29 Inferred Loss Measurement Mode [This I.D.]
28 Direct Loss Measurement Mode [This I.D.]
12.2. MEASUREMENT-ATTRIBUTES TLVs
This document defines the following new PCEP TLV Types; IANA is
requested to make the following TLV type allocations from the "PCEP
TLV Type Indicators" registry.
<http://www.iana.org/assignments/pcep/pcep.xhtml#pcep-tlv-type-
indicators>
Type Name Reference
-------------------------------------------------------------
TBD4 DELAY-MEASUREMENT-ATTRIBUTES [This I.D.]
TBD16 LOSS-MEASUREMENT-ATTRIBUTES [This I.D.]
TBD17 BW-UTILIZATION-MEASUREMENT-ATTRIBUTES [This I.D.]
12.2.1. The Sub-TLVs For MEASUREMENT-ATTRIBUTES TLVs
IANA is requested to create an "MEASUREMENT-ATTRIBUTES Sub-TLV Types"
sub-registry in the "PCEP TLV Type Indicators" registry. New sub-TLV
are allocated only by an IETF Review action [RFC5226].
This document defines the following sub-TLV types:
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Type Name Reference
----------------------------------------------------------
0 Reserved [This I.D.]
1 Measurement-Enable sub-TLV [This I.D.]
2 Measurement-Interval sub-TLV [This I.D.]
3 Report-Threshold sub-TLV [This I.D.]
4 Report-Threshold-Percentage sub-TLV [This I.D.]
5 Report-Interval sub-TLV [This I.D.]
6- Unassigned [This I.D.]
65535
12.2.1.1. Flag Fields in Measurement-Enable sub-TLV
IANA is requested to create a registry to manage the Flag field of
the Measurement-Enable sub-TLV.
New bit numbers are allocated only by an IETF Review action
[RFC5226]. Each bit should be tracked with the following qualities:
o Bit number (counting from bit 0 as the most significant bit)
o Capability description
o Defining RFC
The following value are defined in this document for the Flag field.
Bit Description Reference
------------------------------------------------------------
31 One-Way Delay Measurement Enabled [This I.D.]
30 Two-Way Delay Measurement Enabled [This I.D.]
29 Unidirectional Loss Measurement Enabled [This I.D.]
28 Bidirectional Loss Measurement Enabled [This I.D.]
27 Inferred Loss Measurement Enabled [This I.D.]
26 Bandwidth Utilization Reporting Enabled [This I.D.]
12.3. Measurement Object-Class
This document defines Object-Class for the following Objects; IANA is
requested to make the following allocations from the "PCEP Objects"
registry. <http://www.iana.org/assignments/pcep/pcep.xhtml#pcep-
objects>
Object-Class Name Reference
----------------------------------------------------------
TBD5 DELAY-MEASUREMENT Object [This I.D.]
TBD6 LOSS-MEASUREMENT Object [This I.D.]
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12.3.1. DELAY-MEASUREMENT Object-Types
IANA is requested to create an "DELAY-MEASUREMENT Object-Types"
sub-registry for DELAY-MEASUREMENT Object (Object-class TBD5).
This document defines the following object-types:
Object-Type Name Reference
------------------------------------------------------------------
0 Reserved [This I.D.]
1 One-Way Delay Measurement Value [This I.D.]
2 One-Way Delay Measurement Min/Max Values [This I.D.]
3 One-Way Delay Variation Measurement Value [This I.D.]
4 Two-Way Delay Measurement Value [This I.D.]
5 Two-Way Delay Measurement Min/Max Values [This I.D.]
6 Two-Way Delay Variation Measurement Value [This I.D.]
12.3.2. LOSS-MEASUREMENT Object-Types
IANA is requested to create an "LOSS-MEASUREMENT Object-Types"
sub-registry for LOSS-MEASUREMENT Object (Object-class TBD6).
This document defines the following object-types:
Object-Type Name Reference
----------------------------------------------------------
0 Reserved [This I.D.]
1 Tx Packets-Lost [This I.D.]
2 Rx Packets-Lost [This I.D.]
12.3.3. BANDWIDTH Object-Type
This document defines new Object-Type for the BANDWIDTH object
(Object-Class 5, [RFC5440]); IANA is requested to make the following
allocation from the "PCEP Objects" registry.
<http://www.iana.org/assignments/pcep/pcep.xhtml#pcep-objects>
Object-Type Name Reference
----------------------------------------------------------
TBD14 BANDWIDTH-UTILIZATION Object [This I.D.]
12.4. PCE Error Codes
This document defines two new error-values for PCErr with error-code
19 (Invalid Operation). IANA is requested to make the following
allocations.
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Error-Value Name Reference
-------------------------------------------------------------------
TBD7 Delay-Measurement capability
was not advertised [This I.D.]
TBD8 Loss-Measurement capability
was not advertised [This I.D.]
TBD9 Bidirectional Measurement capability
was not advertised [This I.D.]
TBD10 Unidirectional Measurement capability
was not advertised [This I.D.]
TBD11 Inferred Mode Loss Measurement capability
was not advertised [This I.D.]
TBD12 Direct Mode Loss Measurement capability
was not advertised [This I.D.]
TBD13 Bandwidth Utilization capability
was not advertised [This I.D.]
12.5. Notification Object-Type
IANA is requested to allocate new Notification Types and Notification
Values within the "Notification Object" sub-registry of the PCEP
Numbers registry, as follows:
Type Meaning Reference
--------------------------------------------------------------
TBD15 PM Overwhelm State [This I.D.]
Notification-value=1: Entering PM overwhelm state
Notification-value=2: Clearing PM overwhelm state
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13. References
13.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
May 2008.
[RFC5440] Vasseur, JP. and JL. Le Roux, "Path Computation Element
(PCE) Communication Protocol (PCEP)", RFC 5440, March
2009.
[DRAFT-PCE-STATEFUL] Crabbe, E., Minei, I., Medved, J., and R.
Varga, "PCEP Extensions for Stateful PCE", draft-ietf-pce-
stateful-pce, (work in progress).
[DRAFT-PCE-INITIATED-LSP] Crabbe, E., Minei, I., Sivabalan, S., and
R. Varga, "PCEP Extensions for PCE-initiated LSP Setup in
a Stateful PCE Model", draft-ietf-pce-pce-initiated-lsp,
(work in progress).
13.2. Informative References
[RFC5586] Bocci, M., Ed., Vigoureux, M., Ed., and S. Bryant, Ed.,
"MPLS Generic Associated Channel", RFC 5586, June 2009.
[RFC5921] Bocci, M., Ed., Bryant, S., Ed., Frost, D., Ed., Levrau,
L., and L. Berger, "A Framework for MPLS in Transport
Networks", RFC 5921, July 2010.
[RFC5925] Touch, J., Mankin, A., and R. Bonica, "The TCP
Authentication Option", RFC 5925, June 2010.
[RFC6374] Frost, D. and S. Bryant, "Packet Loss and Delay
Measurement for MPLS Networks", DOI 10.17487/RFC6374, RFC
6374, September 2011.
[RFC6375] Frost, D. and S. Bryant, "A Packet Loss and Delay
Measurement Profile for MPLS-Based Transport Networks",
RFC 6375, September 2011.
[RFC7420] Koushik, A., Stephan, E., Zhao, Q., King, D., and J.
Hardwick, "Path Computation Element Communication Protocol
(PCEP) Management Information Base (MIB) Module", RFC
7420, December 2014.
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[RFC7471] S. Giacalone, D. Ward, J. Drake, A. Atlas, and S. Previdi,
"OSPF Traffic Engineering (TE) Metric Extensions", RFC
7471, March 2015.
[RFC7810] S. Previdi, S. Giacalone, D. Ward, J. Drake, and Q. Wu,
"IS-IS Traffic Engineering (TE) Metric Extensions", RFC
7810, May 2016.
[RFC7823] Atlas, A., Drake, J., Giacalone, S., and S. Previdi,
"Performance-Based Path Selection for Explicitly Routed
Label Switched Paths (LSPs) Using TE Metric Extensions",
RFC 7823, May 2016.
[RFC7876] Bryant, S., Sivabalan, S., and Soni, S., "UDP Return Path
for Packet Loss and Delay Measurement for MPLS Networks",
RFC 7876, July 2016.
[DRAFT-PCE-PCEPS] Lopez, D., Dios, O., Wu, W., and D. Dhody, "Secure
Transport for PCEP", draft-ietf-pce-pceps, (work in
progress).
[DRAFT-PCE-SERVICE-AWARE] Dhody, D., V. Manral, V., Ali, Z., and
Kumaki, K., "Extensions to the Path Computation Element
Communication Protocol (PCEP) to compute service aware
Label Switched Path (LSP)", draft-ietf-pce-pcep-service-
aware, (work in progress).
[DRAFT-IDR-TE-PM-BGP] Wu, Q., Danhua, W., Previdi, S., Gredler, H.,
and S. Ray, "BGP attribute for North-Bound Distribution of
Traffic Engineering (TE) performance Metrics", draft-ietf-
idr-te-pm-bgp (work in progress).
[DRAFT-PCE-PCEP-YANG] Dhody, D., Hardwick, J., Beeram, V., and J.
Tantsura, "A YANG Data Model for Path Computation Element
Communications Protocol (PCEP)", draft-ietf-pce-pcep-yang
(work in progress).
[DRAFT-IETF-PCE-AUTOBW] Dhody, D., Palle, U., Singh, R., Gandhi, R.,
and L. Fang, "PCEP Extensions for MPLS-TE LSP Automatic
Bandwidth Adjustment with Stateful PCE", draft-ietf-pce-
stateful-pce-auto-bandwidth (work in progress).
[IEEE.754.1985] Institute of Electrical and Electronics Engineers,
"Standard for Binary Floating-Point Arithmetic", IEEE
Standard 754, August 1985.
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Acknowledgments
TBA.
Authors' Addresses
Rakesh Gandhi
Cisco Systems, Inc.
EMail: rgandhi@cisco.com
Bin Wen
Comcast
EMail: Bin_Wen@cable.comcast.com
Colby Barth
Juniper Networks
EMail: cbarth@juniper.net
Dhruv Dhody
Huawei Technologies
India
EMail: dhruv.ietf@gmail.com
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