An Architecture for Use of PCE and the PCE Communication Protocol (PCEP) in a Network with Central Control
RFC 8283
Document | Type | RFC - Informational (December 2017; No errata) | |
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Authors | Adrian Farrel , Quintin Zhao , Zhenbin Li , Chao Zhou | ||
Last updated | 2018-12-20 | ||
Replaces | draft-zhao-teas-pce-control-function | ||
Stream | Internent Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Vishnu Beeram | ||
Shepherd write-up | Show (last changed 2017-06-27) | ||
IESG | IESG state | RFC 8283 (Informational) | |
Action Holders |
(None)
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||
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Deborah Brungard | ||
Send notices to | Vishnu Beeram <vbeeram@juniper.net> | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | No IANA Actions |
Internet Engineering Task Force (IETF) A. Farrel, Ed. Request for Comments: 8283 Juniper Networks Category: Informational Q. Zhao, Ed. ISSN: 2070-1721 R. Li Huawei Technologies C. Zhou Cisco Systems December 2017 An Architecture for Use of PCE and the PCE Communication Protocol (PCEP) in a Network with Central Control Abstract The Path Computation Element (PCE) is a core component of Software- Defined Networking (SDN) systems. It can compute optimal paths for traffic across a network and can also update the paths to reflect changes in the network or traffic demands. PCE was developed to derive paths for MPLS Label Switched Paths (LSPs), which are supplied to the head end of the LSP using the Path Computation Element Communication Protocol (PCEP). SDN has a broader applicability than signaled MPLS traffic-engineered (TE) networks, and the PCE may be used to determine paths in a range of use cases including static LSPs, segment routing, Service Function Chaining (SFC), and most forms of a routed or switched network. It is, therefore, reasonable to consider PCEP as a control protocol for use in these environments to allow the PCE to be fully enabled as a central controller. This document briefly introduces the architecture for PCE as a central controller, examines the motivations and applicability for PCEP as a control protocol in this environment, and introduces the implications for the protocol. A PCE-based central controller can simplify the processing of a distributed control plane by blending it with elements of SDN and without necessarily completely replacing it. This document does not describe use cases in detail and does not define protocol extensions: that work is left for other documents. Farrel, et al. Informational [Page 1] RFC 8283 PCE-CC Architecture December 2017 Status of This Memo This document is not an Internet Standards Track specification; it is published for informational purposes. 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). Not all documents approved by the IESG are a candidate for any level of Internet Standard; see 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/rfc8283. 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. Farrel, et al. Informational [Page 2] RFC 8283 PCE-CC Architecture December 2017 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Architecture . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1. Resilience and Scaling . . . . . . . . . . . . . . . . . 8 2.1.1. Partitioned Network . . . . . . . . . . . . . . . . . 9 2.1.2. Multiple Parallel Controllers . . . . . . . . . . . . 10 2.1.3. Hierarchical Controllers . . . . . . . . . . . . . . 12 3. Applicability . . . . . . . . . . . . . . . . . . . . . . . . 13 3.1. Technology-Oriented Applicability . . . . . . . . . . . . 14 3.1.1. Applicability to Control-Plane Operated Networks . . 14 3.1.2. Static LSPs in MPLS . . . . . . . . . . . . . . . . . 14 3.1.3. MPLS Multicast . . . . . . . . . . . . . . . . . . . 15 3.1.4. Transport SDN . . . . . . . . . . . . . . . . . . . . 15 3.1.5. Segment Routing . . . . . . . . . . . . . . . . . . . 15 3.1.6. Service Function Chaining . . . . . . . . . . . . . . 16 3.2. High-Level Applicability . . . . . . . . . . . . . . . . 16Show full document text