Pseudowire Preferential Forwarding Status Bit
RFC 6870
Document | Type |
RFC - Proposed Standard
(February 2013; Errata)
Updated by RFC 7771
Updates RFC 4447
|
|
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Authors | Praveen Muley , Mustapha Aissaoui | ||
Last updated | 2018-12-20 | ||
Replaces | draft-muley-dutta-pwe3-redundancy-bit | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Andy Malis | ||
IESG | IESG state | RFC 6870 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Stewart Bryant | ||
IESG note | Andy Malis (amalis@gmail.com) is the document shepherd. | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) P. Muley, Ed. Request for Comments: 6870 M. Aissaoui, Ed. Updates: 4447 Alcatel-Lucent Category: Standards Track February 2013 ISSN: 2070-1721 Pseudowire Preferential Forwarding Status Bit Abstract This document describes a mechanism for signaling the active and standby status of redundant Pseudowires (PWs) between their termination points. A set of Redundant PWs is configured between Provider Edge (PE) nodes in single-segment pseudowire (SS-PW) applications or between Terminating Provider Edge (T-PE) nodes in Multi-Segment Pseudowire (MS-PW) applications. In order for the PE/T-PE nodes to indicate the preferred PW to use for forwarding PW packets to one another, a new status bit is defined. This bit indicates a Preferential Forwarding status with a value of active or standby for each PW in a redundant set. In addition, a second status bit is defined to allow peer PE nodes to coordinate a switchover operation of the PW. Finally, this document updates RFC 4447 by adding details to the handling of the PW status code bits in the PW Status TLV. 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 5741. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc6870. Muley & Aissaoui Standards Track [Page 1] RFC 6870 PW Preferential Forwarding Status Bit February 2013 Copyright Notice Copyright (c) 2013 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. Muley & Aissaoui Standards Track [Page 2] RFC 6870 PW Preferential Forwarding Status Bit February 2013 Table of Contents 1. Introduction ....................................................4 1.1. Requirements Language ......................................4 2. Motivation and Scope ............................................4 3. Terminology .....................................................7 4. PE Architecture .................................................9 5. Modes of Operation ..............................................9 5.1. Independent Mode ...........................................9 5.2. Master/Slave Mode .........................................12 6. PW State Transition Signaling Procedures .......................14 6.1. PW Standby Notification Procedures in Independent Mode ....14 6.2. PW Standby Notification Procedures in Master/Slave Mode ...15 6.2.1. PW State Machine ...................................16 6.3. Coordination of PW Switchover .............................17 6.3.1. Procedures at the Requesting Endpoint ..............18 6.3.2. Procedures at the Receiving Endpoint ...............20 7. Status Mapping .................................................20 7.1. AC Defect State Entry/Exit ................................21 7.2. PW Defect State Entry/Exit ................................21 8. Applicability and Backward Compatibility .......................21 9. Security Considerations ........................................22 10. MIB Considerations ............................................22 11. IANA Considerations ...........................................22 11.1. Status Code for PW Preferential Forwarding Status ........22 11.2. Status Code for PW Request Switchover Status .............23 12. Contributors ..................................................23 13. Acknowledgments ...............................................24 14. References ....................................................24 14.1. Normative References .....................................24 14.2. Informative References ...................................24Show full document text