Extensions to the Path Computation Element Communication Protocol (PCEP) to Compute Service-Aware Label Switched Paths (LSPs)
RFC 8233

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Internet Engineering Task Force (IETF)                          D. Dhody
Request for Comments: 8233                                         Q. Wu
Category: Standards Track                                         Huawei
ISSN: 2070-1721                                                V. Manral
                                                             Nano Sec Co
                                                                  Z. Ali
                                                           Cisco Systems
                                                               K. Kumaki
                                                        KDDI Corporation
                                                          September 2017

Extensions to the Path Computation Element Communication Protocol (PCEP)
          to Compute Service-Aware Label Switched Paths (LSPs)

Abstract

   In certain networks, such as, but not limited to, financial
   information networks (e.g., stock market data providers), network
   performance criteria (e.g., latency) are becoming as critical to data
   path selection as other metrics and constraints.  These metrics are
   associated with the Service Level Agreement (SLA) between customers
   and service providers.  The link bandwidth utilization (the total
   bandwidth of a link in actual use for the forwarding) is another
   important factor to consider during path computation.

   IGP Traffic Engineering (TE) Metric Extensions describe mechanisms
   with which network performance information is distributed via OSPF
   and IS-IS, respectively.  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.  This document describes the extension to PCEP
   to carry latency, delay variation, packet loss, and link bandwidth
   utilization as constraints for end-to-end path computation.

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/rfc8233.

Dhody, et al.                Standards Track                    [Page 1]
RFC 8233                   Service-Aware LSPs             September 2017

Copyright Notice

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   document authors.  All rights reserved.

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   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................3
      1.1. Requirements Language ......................................4
   2. Terminology .....................................................4
   3. PCEP Extensions .................................................5
      3.1. Extensions to METRIC Object ................................5
           3.1.1. Path Delay Metric ...................................6
                  3.1.1.1. Path Delay Metric Value ....................7
           3.1.2. Path Delay Variation Metric .........................7
                  3.1.2.1. Path Delay Variation Metric Value ..........8
           3.1.3. Path Loss Metric ....................................8
                  3.1.3.1. Path Loss Metric Value .....................9
           3.1.4. Non-Understanding / Non-Support of
                  Service-Aware Path Computation ......................9
           3.1.5. Mode of Operation ..................................10
                  3.1.5.1. Examples ..................................11
           3.1.6. Point-to-Multipoint (P2MP) .........................11
                  3.1.6.1. P2MP Path Delay Metric ....................11
                  3.1.6.2. P2MP Path Delay Variation Metric ..........12
                  3.1.6.3. P2MP Path Loss Metric .....................12
      3.2. Bandwidth Utilization .....................................12
           3.2.1. Link Bandwidth Utilization (LBU) ...................12
           3.2.2. Link Reserved Bandwidth Utilization (LRBU) .........13