Path Computation Element (PCE) Protocol Extensions for Stateful PCE Usage in GMPLS-controlled Networks
draft-ietf-pce-pcep-stateful-pce-gmpls-08
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2018-02-26
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PCE Working Group Xian Zhang
Internet-Draft Young Lee (Editor)
Intended status: Standards Track Fatai Zhang
Huawei
Ramon Casellas
CTTC
Oscar Gonzalez de Dios
Telefonica I+D
Zafar Ali
Cisco Systems
Expires: August 26, 2018 February 26, 2018
Path Computation Element (PCE) Protocol Extensions for Stateful PCE
Usage in GMPLS-controlled Networks
draft-ietf-pce-pcep-stateful-pce-gmpls-08.txt
Abstract
The Path Computation Element (PCE) facilitates Traffic Engineering
(TE) based path calculation in large, multi-domain, multi-region, or
multi-layer networks. The PCE communication Protocol (PCEP) has been
extended to support stateful PCE functions where the PCE retains
information about the paths already present in the network, but
those extensions are technology-agnostic. This memo provides
extensions required for PCEP so as to enable the usage of a stateful
PCE capability in GMPLS-controlled networks.
Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with
the provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts.
Internet-Drafts are draft documents valid for a maximum of six
months and may be updated, replaced, or obsoleted by other
Zhang et al Expires August 2018 [Page 1]
Internet-Draft Stateful PCEP for GMPLS February 2018
documents at any time. It is inappropriate to use Internet-Drafts
as reference material or to cite them other than as "work in
progress."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html.
This Internet-Draft will expire on August 26, 2018.
Copyright Notice
Copyright (c) 2018 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
(http://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.
Conventions used in this document
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].
Table of Contents
Table of Contents.................................................2
1. Introduction...................................................3
2. Context of Stateful PCE and PCEP for GMPLS.....................4
3. Main Requirements..............................................4
4. PCEP Extensions................................................5
4.1. LSP Update in GMPLS-controlled Networks...................5
4.2. LSP Synchronization in GMPLS-controlled Networks..........5
4.3. Modification of Existing PCEP Messages and Procedures.....7
4.3.1. Modification for LSP Re-optimization.................7
4.3.2. Modification for Route Exclusion.....................8
Zhang et al Expires August 2018 [Page 2]
Internet-Draft Stateful PCEP for GMPLS February 2018
4.3.3. Modification for SRP Object to indicate Bi-directional
LSP.........................................................9
4.4. Object Encoding...........................................9
5. IANA Considerations...........................................10
5.1. New PCEP Error Codes.....................................10
5.2. New Subobject for the Exclude Route Object...............10
5.3. New "B" Flag in the SRP Object...........................10
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