Path Computation Element Communication Protocol (PCEP) Extensions for MPLS-TE Label Switched Path (LSP) Auto-Bandwidth Adjustment with Stateful PCE
RFC 8733
Internet Engineering Task Force (IETF) D. Dhody, Ed.
Request for Comments: 8733 Huawei Technologies
Category: Standards Track R. Gandhi, Ed.
ISSN: 2070-1721 Cisco Systems, Inc.
U. Palle
R. Singh
Individual Contributor
L. Fang
Expedia Group, Inc.
February 2020
Path Computation Element Communication Protocol (PCEP) Extensions for
MPLS-TE Label Switched Path (LSP) Auto-Bandwidth Adjustment with
Stateful PCE
Abstract
The Path Computation Element Communication Protocol (PCEP) provides
mechanisms for Path Computation Elements (PCEs) to perform path
computations in response to Path Computation Client (PCC) requests.
Stateful PCE extensions allow stateful control of MPLS-TE Label
Switched Paths (LSPs) using PCEP.
The auto-bandwidth feature allows automatic and dynamic adjustment of
the TE LSP bandwidth reservation based on the volume of traffic
flowing through the LSP. This document describes PCEP extensions for
auto-bandwidth adjustment when employing an active stateful PCE for
both PCE-initiated and PCC-initiated LSPs.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8733.
Copyright Notice
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Table of Contents
1. Introduction
2. Conventions Used in This Document
2.1. Requirements Language
2.2. Abbreviations
2.3. Terminology
3. Requirements for PCEP Extensions
4. Architectural Overview
4.1. Auto-Bandwidth Overview
4.2. Auto-Bandwidth Theory of Operation
4.3. Scaling Considerations
5. PCEP Extensions
5.1. Capability Advertisement
5.1.1. AUTO-BANDWIDTH-CAPABILITY TLV
5.2. AUTO-BANDWIDTH-ATTRIBUTES TLV
5.2.1. Sample-Interval Sub-TLV
5.2.2. Adjustment-Intervals
5.2.2.1. Adjustment-Interval Sub-TLV
5.2.2.2. Down-Adjustment-Interval Sub-TLV
5.2.3. Adjustment-Thresholds
5.2.3.1. Adjustment-Threshold Sub-TLV
5.2.3.2. Adjustment-Threshold-Percentage Sub-TLV
5.2.3.3. Down-Adjustment-Threshold Sub-TLV
5.2.3.4. Down-Adjustment-Threshold-Percentage Sub-TLV
5.2.4. Minimum and Maximum-Bandwidth Values
5.2.4.1. Minimum-Bandwidth Sub-TLV
5.2.4.2. Maximum-Bandwidth Sub-TLV
5.2.5. Overflow and Underflow Conditions
5.2.5.1. Overflow-Threshold Sub-TLV
5.2.5.2. Overflow-Threshold-Percentage Sub-TLV
5.2.5.3. Underflow-Threshold Sub-TLV
5.2.5.4. Underflow-Threshold-Percentage Sub-TLV
5.3. BANDWIDTH Object
5.4. The PCInitiate Message
5.5. The PCUpd Message
5.6. The PCRpt Message
5.7. The PCNtf Message
6. Manageability Considerations
6.1. Control of Function and Policy
6.2. Information and Data Models
6.3. Liveness Detection and Monitoring
6.4. Verifying Correct Operations
6.5. Requirements for Other Protocols
6.6. Impact on Network Operations
7. Security Considerations
8. IANA Considerations
8.1. PCEP TLV Type Indicators
8.2. AUTO-BANDWIDTH-CAPABILITY TLV Flag Field
8.3. AUTO-BANDWIDTH-ATTRIBUTES Sub-TLV
8.4. Error Object
8.5. Notification Object
9. References
9.1. Normative References
9.2. Informative References
Acknowledgments
Contributors
Authors' Addresses
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