Internet DRAFT - draft-zhang-pce-enhanced-detnet
draft-zhang-pce-enhanced-detnet
Network Working Group L. Zhang
Internet-Draft X. Geng
Intended status: Standards Track T. Zhou
Expires: 1 September 2024 Huawei
29 February 2024
PCEP for Enhanced DetNet
draft-zhang-pce-enhanced-detnet-04
Abstract
PCEP is used to provide a communication between a PCC and a PCE.
This document defines the extensions to PCEP to support the bounded-
latency path computation. Specifically, two new objects and three
new TLVs are defined for the transmission of bounded latency
information between PCC and PCE to guarantee the bounded latency
transmission in control plane.
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 RFC 2119 [RFC2119].
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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This Internet-Draft will expire on 1 September 2024.
Copyright Notice
Copyright (c) 2024 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
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Please review these documents carefully, as they describe your rights
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Object Formats . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Open Object . . . . . . . . . . . . . . . . . . . . . . . 3
3.1.1. Bounded Latency Capability TLV . . . . . . . . . . . 3
3.2. RP Object . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2.1. BLI Type TLV . . . . . . . . . . . . . . . . . . . . 5
3.3. Traffic Model Object . . . . . . . . . . . . . . . . . . 6
3.4. BLI Object . . . . . . . . . . . . . . . . . . . . . . . 8
3.4.1. BLI List TLV . . . . . . . . . . . . . . . . . . . . 8
3.4.2. Shared BLI TLV . . . . . . . . . . . . . . . . . . . 9
4. SR Policy for BLI . . . . . . . . . . . . . . . . . . . . . . 10
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
5.1. New TLV Type . . . . . . . . . . . . . . . . . . . . . . 10
5.2. New Object . . . . . . . . . . . . . . . . . . . . . . . 10
6. Security Considerations . . . . . . . . . . . . . . . . . . . 11
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 11
8. Normative References . . . . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
[RFC8665] provides the overall architecture for Deterministic
Networking (DetNet), which provides the capability to carry specified
unicast or multicast data flows with extremely low data loss rates
and bounded end-to-end latency within a network domain. Based on
this, [draft-finn-detnet-bounded-latency] proposed a timing model for
sources, destinations, and DetNet transit nodes. Using the model, it
provides a methodology to compute end-to-end latency and backlog
bounds for various queuing methods.
[RFC5440] describes the Path Computation Element Protocol (PCEP) for
communications between a Path Computation Client (PCC) and a Path
Computation Element (PCE), or between two PCEs. PCEP defines the
interaction and data format of path calculation requests and path
computation replies between PCC and PCE.[RFC8231] specifies extension
to PCEP to enable stateful control of LSPs within and across PCEP
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sessions in compliance
with[RFC4657].[I-D.yzz-detnet-enhanced-data-plane] enhances the
DetNet data plane by introducing Bounded Latency Information (BLI)
which facilitates DetNet transit nodes to guarantee the bounded
latency transmission in data plane. Based on
that,[I-D.geng-spring-sr-enhanced-detnet] defines how to leverage
Segment Routing (SR) and Segment Routing over IPv6 (SRv6) to
implement bounded latency.
When a PCE is used to compute paths using PCEP, it is important that
the PCE understands the bounded latency requirement and the head end
of the path also need to understands the bounded latency information
associated with the candidate path.
This document defines the extensions to PCEP to support the bounded-
latency path computation. Specifically, two new objects and three
new TLVs are defined for the transmission of bounded latency
information between PCC and PCE to guarantee the bounded latency
transmission in control plane.
2. Terminology
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[RFC2119].
3. Object Formats
3.1. Open Object
[RFC5440] defines the Open object in open message used to specify the
PCEP version, Keepalive frequency, DeadTimer, PCEP session ID, and
other communication parameters. The Open object may also contain a
set of TLVs used to convey various session characteristics.
3.1.1. Bounded Latency Capability TLV
During the PCEP initialization phase, PCEP speakers SHOULD advertise
their support of Bounded Latency features, for this reason this
document defines the Bounded Latency capability TLV.
A PCEP speaker includes the Bounded Latency capability TLV in the
Open object to advertise its support for Bounded Latency features.
The format of the Bounded Latency capability TLV is formatted as
follows:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=TBD1 | Length=4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type Flag | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type: To be assigned by IANA.
Length: 16 bits value to indicate the length of the value portion in
bytes.
Type-Flag: 16 bits of flags to indicate which kind of BLI Type the
speaker supports. A new registry “Bounded Latency Type Flags” is
expected to be created. Table 1 shows the assignment of Bounded
Latency Type Flags. The speaker sets the defined bit in flag to
indicate that it supports this Type of BLI. The undefined bits MUST
be set to zero by the sender and MUST be ignored by the receiver.
+----------------+---------------------------------------+---------------------------------------+
| Bit | BLI Type | BLI Format |
+----------------+---------------------------------------+---------------------------------------+
| 0 | Reserved | Undefined |
+----------------+---------------------------------------+---------------------------------------+
| 1 | Time resource ID | 32-bit unsigned Integer |
+----------------+---------------------------------------+---------------------------------------+
| 2 | Priority | 8-bit unsigned Integer |
+----------------+---------------------------------------+---------------------------------------+
| 3 | End-to-end delay budget | 32-bit unsigned Integer |
+----------------+---------------------------------------+---------------------------------------+
| 4 | Local delay budget | 32-bit unsigned Integer |
+----------------+---------------------------------------+---------------------------------------+
| 5 | Reserved | Undefined |
+----------------+---------------------------------------+---------------------------------------+
| 6 | Reserved | Undefined |
+----------------+---------------------------------------+---------------------------------------+
| 7 | End-to-end delay variation budget | 16-bit unsigned Integer |
+----------------+---------------------------------------+---------------------------------------+
| 8 | Local delay variation budget | 16-bit unsigned Integer |
+----------------+---------------------------------------+---------------------------------------+
| 9-15 | Undefined | Undefined |
+----------------+---------------------------------------+---------------------------------------+
Table1: The BLI type and format of each bit flag
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3.2. RP Object
The RP (Request Parameters) object is defined in[RFC5440], used to
specify various characteristics of the path computation request and
MUST be carried within each PCReq and PCRep messages. The format of
RP object is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags |O|B|R| Pri |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Request-ID-number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
// Optional TLVs //
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The detail information about the fields in the RP object is defined
in section 7.4 of[RFC5440].
3.2.1. BLI Type TLV
In order to specify the type and format of the BLI associated with
candidate path, this document defines a new TLV named BLI type TLV.
The BLI type TLV is formatted as follow:
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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| BLI Type | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Where:
Type: to be assigned by IANA.
Length: 16 bits value to indicate the length of the value portion in
bytes. The value of this field is 4.
BLI Type: 8 bits value to indicate the type of BLI that PCC desires.
Table 3 shows the values and their corresponding BLI types.
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+----------------+---------------------------------------+---------------------------------------+
| BLI Type Value | Bounded Latency Information | Format |
+----------------+---------------------------------------+---------------------------------------+
| 0 | Reserved | Undefined |
+----------------+---------------------------------------+---------------------------------------+
| 1 | Time resource ID | 32-bit unsigned Integer |
+----------------+---------------------------------------+---------------------------------------+
| 2 | Priority | 8-bit unsigned Integer |
+----------------+---------------------------------------+---------------------------------------+
| 3 | End-to-end delay variation budget | 16-bit unsigned Integer |
+----------------+---------------------------------------+---------------------------------------+
| 4 | Local delay budget | 32-bit unsigned Integer |
+----------------+---------------------------------------+---------------------------------------+
| 5 | End-to-end queue delay budget | 32-bit unsigned Integer |
+----------------+---------------------------------------+---------------------------------------+
| 6 | Local queue delay budget | 32-bit unsigned Integer |
+----------------+---------------------------------------+---------------------------------------+
Table2: The BLI type and format of each value
When PCC needs to request a bounded-latency path, it MUST include the
BLI Type TLV in the RP object in PCReq message. If a PCC includes an
BLI Type TLV on a path calculation request, then the PCE will reply
the specific type of BLI associated with computed path.
3.3. Traffic Model Object
The Traffic Model Object is optional in the PCReq message and used to
specify the traffic model for the bounded-latency path computation.
The traffic model object contains a set of fields used to specify the
traffic features.[RFC9016] defines the traffic specification of the
DetNet flow, which includes a set of attributes to specify how the
DetNet Ingress transmits packets for the DetNet flow. Based on that,
this document proposes the Traffic Model Object to describe the
DetNet flow for bounded-latency path computation.
Traffic Model Object-Class is TBD3;
Traffic Model Object-Type is 1.
The format of the Traffic Model Object is shown in below:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Traffic ID | Flags |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MinPacketsPerInterval | MaxPacketsPerInterval |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MinPayloadSize | MaxPayloadSize |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Interval |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MinBandwidth |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MaxLatency |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MaxLatencyVariation |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
// Optional TLVs //
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Where:
Traffic ID: The only identification of the specify traffic in PCC.
When the PCC need to request a path computation for a traffic, it
MUST assign a 16-bit traffic identifier to specify the traffic in
local.
Flags: 16 bits of flags. A new registry “Traffic Model Flags” is
expected to be created. At the writing time, all flags are unused
and undefined.
MinPacketsPerInterval: the minimum number of packets that the Ingress
will transmit in one Interval.
MaxPacketsPerInterval: the maximum number of packets that the Ingress
will transmit in one Interval.
MinPayloadSize: the minimum payload size that the Ingress will
transmit.
MaxPayloadSize: the maximum payload size that the Ingress will
transmit.
Interval: the period of time in which the traffic specification is
specified.
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MinBandwith: the minimum bandwidth that has to be guaranteed for the
DetNet traffic.
MaxLatency: the end-to-end maximum latency for a single packet of the
DetNet traffic.
MaxLatencyVariation: the difference between the minimum and the
maximum end-to-end, one-way latency.
The Traffic Model object body has a variable length and may contain
TLVs for the additional attributes of the traffic model. At the
writing time there is no TLV defined for Traffic Mode Object.
3.4. BLI Object
In order to support the bounded-latency path computation, a new kind
of object named BLI object is defined in this document to indicate
the bounded latency information of a candidate path.
The BLI object is optionally carried within a PCRep message so as to
indicate the requirement and resource allocation for the candidate
path. When a PCC request a bounded-latency path computation and the
PCE find out a path satisfying the set of constraints, the PCE MUST
include the BLI object in PCRep message.
BLI Object-Class is TBD4.
BLI Object-Type is 1.
The format of BLI object is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
// Optional TLVs //
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The BLI object body has a variable length and may contain TLVs for
the different kinds of BLI. This document defines two kinds of BLI
TLV for different scenarios.
3.4.1. BLI List TLV
When all of the nodes in the Explicit Route Object (ERO)[RFC5440]
request different BLI to guarantee bounded latency, a BLI list TLV is
defined.
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The BLI list sub-TLV is formatted as follows.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=TBD5 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| BLI List [m] |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| BLI List [1] |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Where:
Type: to be assigned by IANA.
Length: 16 bits length value to indicate the length of BLI list in
octet.
BLI List [1… m]: 32 bits length bounded latency information,
representing the nth BLI in the BLI list.
The BLI in the BLI List corresponds to the node in the ERO object one
by one. The length of the BLI List depends on the number of nodes in
the ERO object.
3.4.2. Shared BLI TLV
When all of the nodes in the ERO indicated by the sub-object list
request BLI to guarantee bounded latency with the same BLI value, the
Shared BLI TLV is defined.
The Shared BLI TLV is defined as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=TBD6 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| BLI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Where:
Type: to be assigned by IANA.
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Length: 16 bits value to indicate the length of BLI in octet.
BLI: 32 bits value of Bounded Latency Information to guarantee the
bounded latency.
4. SR Policy for BLI
[I-D.ietf-pce-segment-routing-policy-cp] proposes extension to PCEP
to support association among candidate paths of a given SR policy.
For the bounded latency path, the additional bounded latency
information associated with the candidate path SHOULD be carried with
SR Policy. Therefore, the additional BLI TLV SHOULD be defined to
indicate the bounded-latency requirement and resources allocation for
the nodes along the candidate path. For different scenario,
different BLI TLV need to be carried by SR policy.
When all of the nodes/adjacencies in the explicit path indicated by
the segment list request different BLI to guarantee bounded latency,
a BLI list TLV is need to be carried by SR Policy. The BLI list TLV
is defined in section 3.4.1.
When all of the nodes/adjacencies in the explicit path indicated by
the segment list request BLI to guarantee bounded latency with the
same BLI value, a Shared BLI TLV is need to be carried by SR Policy.
The Shared BLI TLV is defined in section 3.4.2.
5. IANA Considerations
This document defines four new TLVs and two new Object.
5.1. New TLV Type
+-----------------+---------------------------------+----------------+
| Value | Name | Reference |
+-----------------+---------------------------------+----------------+
| TBD1 | Bounded-Latency Capability TLV | This document |
+-----------------+---------------------------------+----------------+
| TBD2 | BLI Type TLV | This document |
+-----------------+---------------------------------+----------------+
| TBD5 | BLI list TLV | This document |
+-----------------+---------------------------------+----------------+
| TBD6 | Shared BLI TLV | This document |
+-----------------+---------------------------------+----------------+
5.2. New Object
IANA is requested to make the assignment from the “PCEP Object” sub-
registry as follows:
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+-----------------+---------------------------------+----------------+
| Value | Name | Reference |
+-----------------+---------------------------------+----------------+
| TBD3 | Traffic Model Object | This document |
+-----------------+---------------------------------+----------------+
| TBD4 | BLI Object | This document |
+-----------------+---------------------------------+----------------+
6. Security Considerations
TBD
7. Acknowledgements
8. Normative References
[I-D.geng-spring-sr-enhanced-detnet]
Geng, X., Li, Z., and T. Zhou, "Segment Routing for
Enhanced DetNet", Work in Progress, Internet-Draft, draft-
geng-spring-sr-enhanced-detnet-01, 13 March 2023,
<https://datatracker.ietf.org/doc/html/draft-geng-spring-
sr-enhanced-detnet-01>.
[I-D.ietf-pce-segment-routing-policy-cp]
Koldychev, M., Sivabalan, S., Barth, C., Peng, S., and H.
Bidgoli, "PCEP Extensions for SR Policy Candidate Paths",
Work in Progress, Internet-Draft, draft-ietf-pce-segment-
routing-policy-cp-14, 9 February 2024,
<https://datatracker.ietf.org/doc/html/draft-ietf-pce-
segment-routing-policy-cp-14>.
[I-D.yzz-detnet-enhanced-data-plane]
Geng, X., Zhou, T., Zhang, L., and Z. Du, "DetNet Enhanced
Data Plane", Work in Progress, Internet-Draft, draft-yzz-
detnet-enhanced-data-plane-03, 23 October 2023,
<https://datatracker.ietf.org/doc/html/draft-yzz-detnet-
enhanced-data-plane-03>.
[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>.
[RFC4657] Ash, J., Ed. and J.L. Le Roux, Ed., "Path Computation
Element (PCE) Communication Protocol Generic
Requirements", RFC 4657, DOI 10.17487/RFC4657, September
2006, <https://www.rfc-editor.org/info/rfc4657>.
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[RFC5440] Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation
Element (PCE) Communication Protocol (PCEP)", RFC 5440,
DOI 10.17487/RFC5440, March 2009,
<https://www.rfc-editor.org/info/rfc5440>.
[RFC8231] Crabbe, E., Minei, I., Medved, J., and R. Varga, "Path
Computation Element Communication Protocol (PCEP)
Extensions for Stateful PCE", RFC 8231,
DOI 10.17487/RFC8231, September 2017,
<https://www.rfc-editor.org/info/rfc8231>.
[RFC8665] Psenak, P., Ed., Previdi, S., Ed., Filsfils, C., Gredler,
H., Shakir, R., Henderickx, W., and J. Tantsura, "OSPF
Extensions for Segment Routing", RFC 8665,
DOI 10.17487/RFC8665, December 2019,
<https://www.rfc-editor.org/info/rfc8665>.
[RFC9016] Varga, B., Farkas, J., Cummings, R., Jiang, Y., and D.
Fedyk, "Flow and Service Information Model for
Deterministic Networking (DetNet)", RFC 9016,
DOI 10.17487/RFC9016, March 2021,
<https://www.rfc-editor.org/info/rfc9016>.
Authors' Addresses
Li Zhang
Huawei
Email: zhangli344@huawei.com
Xuesong Geng
Huawei
Email: gengxuesong@huawei.com
Tianran Zhou
Huawei
Email: zhoutianran@huawei.com
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