Extensions to BGP-Signaled Pseudowires to Support Flow-Aware Transport Labels
RFC 8395
| Document | Type |
RFC - Proposed Standard
(June 2018; No errata)
Updates RFC 4761
|
|
|---|---|---|---|
| Last updated | 2018-06-26 | ||
| Replaces | draft-keyupate-bess-fat-pw-bgp | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Martin Vigoureux | ||
| Shepherd write-up | Show (last changed 2017-08-24) | ||
| IESG | IESG state | RFC 8395 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Alvaro Retana | ||
| Send notices to | aretana.ietf@gmail.com | ||
| IANA | IANA review state | IANA OK - Actions Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) K. Patel
Request for Comments: 8395 Arrcus
Updates: 4761 S. Boutros
Category: Standards Track VMware
ISSN: 2070-1721 J. Liste
Cisco
B. Wen
Comcast
J. Rabadan
Nokia
June 2018
Extensions to BGP-Signaled Pseudowires to
Support Flow-Aware Transport Labels
Abstract
This document defines protocol extensions required to synchronize
flow label states among Provider Edges (PEs) when using the BGP-based
signaling procedures. These protocol extensions are equally
applicable to point-to-point Layer 2 Virtual Private Networks
(L2VPNs). This document updates RFC 4761 by defining new flags in
the Control Flags field of the Layer2 Info Extended Community.
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 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/rfc8395.
Patel, et al. Standards Track [Page 1]
RFC 8395 BGP-Signaled FAT PW Labels June 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
(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
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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.
Table of Contents
1. Introduction ....................................................2
1.1. Requirements Language ......................................3
2. Modifications to the Layer2 Info Extended Community .............4
3. Signaling the Presence of the Flow Label ........................5
4. IANA Considerations .............................................6
5. Security Considerations .........................................6
6. References ......................................................7
6.1. Normative References .......................................7
6.2. Informative References .....................................7
Acknowledgements ...................................................8
Contributors .......................................................8
Authors' Addresses .................................................9
1. Introduction
The mechanism described in [RFC6391] uses an additional label (Flow
Label) in the MPLS label stack to allow Label Switching Routers
(LSRs) to balance flows within Pseudowires (PWs) at a finer
granularity than the individual PWs across the Equal Cost Multiple
Paths (ECMPs) that exists within the Packet Switched Network (PSN).
Furthermore, [RFC6391] defines the LDP protocol extensions required
to synchronize the flow label states between the ingress and egress
PEs when using the signaling procedures defined in the [RFC8077].
A PW [RFC3985] is transported over one single network path, even if
ECMPs exist between the ingress and egress PW provider edge (PE)
equipment. This is required to preserve the characteristics of the
emulated service.
Patel, et al. Standards Track [Page 2]
RFC 8395 BGP-Signaled FAT PW Labels June 2018
This document introduces an optional mode of operation allowing a PW
to be transported over ECMPs, for example when the use of ECMPs is
known to be beneficial to the operation of the PW. This
specification uses the principles defined in [RFC6391] and augments
the BGP-signaling procedures of [RFC4761] and [RFC6624]. The use of
a single path to preserve the packet delivery order remains the
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