LSP Object Flag Extension of Stateful PCE
draft-ietf-pce-lsp-extended-flags-00
PCE Q. Xiong
Internet-Draft ZTE Corporation
Intended status: Standards Track March 8, 2021
Expires: September 9, 2021
LSP Object Flag Extension of Stateful PCE
draft-ietf-pce-lsp-extended-flags-00
Abstract
RFC 8231 describes a set of extensions to Path Computation Element
Communication Protocol (PCEP) to enable stateful control of MPLS-TE
and GMPLS Label Switched Paths(LSPs) via PCEP. One of the extensions
is the LSP object which includes a Flag field of the length of 12
bits. However, 11 bits of the Flag field have already been assigned
in RFC 8231, RFC 8281 and RFC 8623.
This document proposes to define a new LSP-EXTENDED-FLAG TLV for the
LSP object for an extended flag field.
Status of This Memo
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This Internet-Draft will expire on September 9, 2021.
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Internet-Draft LSP Object Flag Extension of Stateful PCE March 2021
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions used in this document . . . . . . . . . . . . . . 3
2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Requirements Language . . . . . . . . . . . . . . . . . . 3
3. PCEP Extension . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. The LSP-EXTENDED-FLAG TLV . . . . . . . . . . . . . . . . 3
3.2. Processing . . . . . . . . . . . . . . . . . . . . . . . 4
4. Backward Compatibility . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
5.1. LSP Object . . . . . . . . . . . . . . . . . . . . . . . 4
5.1.1. PCEP TLV Type Indicators . . . . . . . . . . . . . . 4
5.1.2. LSP Extended Flags Field . . . . . . . . . . . . . . 4
6. Security Considerations . . . . . . . . . . . . . . . . . . . 5
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 5
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
9.1. Normative References . . . . . . . . . . . . . . . . . . 5
9.2. Informative References . . . . . . . . . . . . . . . . . 6
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
[RFC5440] describes the Path Computation Element Protocol (PCEP)
which is used between a Path Computation Element (PCE) and a Path
Computation Client (PCC) (or other PCE) to enable computation of
Multi-protocol Label Switching (MPLS) for Traffic Engineering Label
Switched Path (TE LSP).
PCEP Extensions for the Stateful PCE Model [RFC8231] describes a set
of extensions to PCEP to enable active control of MPLS-TE and
Generalized MPLS (GMPLS) tunnels. One of the extensions is the LSP
object which contains a flag field; bits in the flag field are used
to indicate delegation, syncronization, removal, etc.
As defined in [RFC8231], the length of the flag field is 12 bits and
the value from bit 5 to bit 11 is used for operational,
administrative, remove, synchronize and delegate bits respectively.
The bit value 4 is assigned in [RFC8281] for create for PCE-Initiated
LSPs. The bits from 1 to 3 is assigned in [RFC8623] for Explicit
Route Object (ERO)-compression, fragmentation and Point-to-Multipoint
(P2MP) respectively. Almost all bits of the Flag field has been
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