Pseudowire Redundancy on the Switching Provider Edge (S-PE)
RFC 7795
Document | Type | RFC - Proposed Standard (February 2016; No errata) | |
---|---|---|---|
Authors | Jie Dong , Haibo Wang | ||
Last updated | 2016-02-26 | ||
Replaces | draft-ietf-pwe3-redundancy-spe | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Matthew Bocci | ||
Shepherd write-up | Show (last changed 2015-08-04) | ||
IESG | IESG state | RFC 7795 (Proposed Standard) | |
Action Holders |
(None)
|
||
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Deborah Brungard | ||
Send notices to | draft-ietf-pals-redundancy-spe.all@ietf.org | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | No IANA Actions |
Internet Engineering Task Force (IETF) J. Dong Request for Comments: 7795 H. Wang Category: Standards Track Huawei Technologies ISSN: 2070-1721 February 2016 Pseudowire Redundancy on the Switching Provider Edge (S-PE) Abstract This document describes Multi-Segment Pseudowire (MS-PW) protection scenarios in which pseudowire redundancy is provided on the Switching Provider Edge (S-PE) as defined in RFC 5659. Operations of the S-PEs that provide PW redundancy are specified in this document. Signaling of the Preferential Forwarding status as defined in RFCs 6870 and 6478 is reused. This document does not require any change to the Terminating Provider Edges (T-PEs) of MS-PW. 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/rfc7795. Copyright Notice Copyright (c) 2016 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. Dong & Wang Standards Track [Page 1] RFC 7795 PW Redundancy on S-PE February 2016 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Typical Scenarios of PW Redundancy on S-PE . . . . . . . . . 3 2.1. MS-PW Redundancy on S-PE . . . . . . . . . . . . . . . . 3 2.2. MS-PW Redundancy on S-PE with S-PE Protection . . . . . . 4 3. S-PE Operations . . . . . . . . . . . . . . . . . . . . . . . 4 4. Applications of PW Redundancy on S-PE . . . . . . . . . . . . 5 4.1. Applications in Scenario 1 . . . . . . . . . . . . . . . 5 4.2. Applications in Scenario 2 . . . . . . . . . . . . . . . 6 5. VCCV Considerations . . . . . . . . . . . . . . . . . . . . . 7 6. Security Considerations . . . . . . . . . . . . . . . . . . . 7 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 7 7.1. Normative References . . . . . . . . . . . . . . . . . . 7 7.2. Informative References . . . . . . . . . . . . . . . . . 8 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 9 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9 1. Introduction [RFC6718] describes the framework and requirements for pseudowire (PW) redundancy, and [RFC6870] specifies a PW redundancy mechanism for scenarios where a set of redundant PWs are configured between Provider Edge (PE) nodes in Single-Segment Pseudowire (SS-PW) [RFC3985] applications, or between Terminating Provider Edge (T-PE) nodes in Multi-Segment Pseudowire (MS-PW) [RFC5659] applications. In some MS-PW scenarios, there are benefits of providing PW redundancy on Switching Provider Edges (S-PEs), such as reducing the burden on the access T-PE nodes and enabling faster protection switching compared to the end-to-end MS-PW protection mechanisms. This document describes some scenarios in which PW redundancy is provided on S-PEs and specifies the operations of the S-PEs. The S-PEs connect to the neighboring T-PEs or S-PEs with PW segments. For the S-PE that provides PW redundancy for an MS-PW, there is a single PW segment on one side, which is called the single-homed side, and there are multiple PW segments on the other side, which is called the multi-homed side. The scenario in which the S-PE has two multi- homed sides is out of scope. Signaling of the Preferential Forwarding status as defined in [RFC6870] and [RFC6478] is reused. This document does not require any change to the T-PEs of MS-PW. 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].Show full document text