Extensions to the Path Computation Element Communication Protocol (PCEP) to Compute Service-Aware Label Switched Paths (LSPs)
RFC 8233
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
Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
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
Show full document text