[Errata Verified] RFC5884 (5085)
RFC Errata System <rfc-editor@rfc-editor.org> Fri, 15 December 2017 21:30 UTC
Return-Path: <wwwrun@rfc-editor.org>
X-Original-To: rtg-bfd@ietfa.amsl.com
Delivered-To: rtg-bfd@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A31A712943F; Fri, 15 Dec 2017 13:30:32 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.201
X-Spam-Level:
X-Spam-Status: No, score=-4.201 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6p4kY6nRLNEx; Fri, 15 Dec 2017 13:30:30 -0800 (PST)
Received: from rfc-editor.org (rfc-editor.org [4.31.198.49]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 92EB412943D; Fri, 15 Dec 2017 13:30:30 -0800 (PST)
Received: by rfc-editor.org (Postfix, from userid 30) id 7B56CB8195C; Fri, 15 Dec 2017 13:30:02 -0800 (PST)
To: balajir@juniper.net, rahul@juniper.net, kireeti@juniper.net, tom.nadeau@bt.com, swallow@cisco.com
Subject: [Errata Verified] RFC5884 (5085)
X-PHP-Originating-Script: 30:errata_mail_lib.php
From: RFC Errata System <rfc-editor@rfc-editor.org>
Cc: db3546@att.com, iesg@ietf.org, rtg-bfd@ietf.org, rfc-editor@rfc-editor.org
Content-Type: text/plain; charset="UTF-8"
Message-Id: <20171215213002.7B56CB8195C@rfc-editor.org>
Date: Fri, 15 Dec 2017 13:30:02 -0800
Archived-At: <https://mailarchive.ietf.org/arch/msg/rtg-bfd/lTclxrlv6mB-uOdriLdCL4GcFNk>
X-BeenThere: rtg-bfd@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: "RTG Area: Bidirectional Forwarding Detection DT" <rtg-bfd.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/rtg-bfd>, <mailto:rtg-bfd-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/rtg-bfd/>
List-Post: <mailto:rtg-bfd@ietf.org>
List-Help: <mailto:rtg-bfd-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/rtg-bfd>, <mailto:rtg-bfd-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 15 Dec 2017 21:30:33 -0000
The following errata report has been verified for RFC5884, "Bidirectional Forwarding Detection (BFD) for MPLS Label Switched Paths (LSPs)". -------------------------------------- You may review the report below and at: http://www.rfc-editor.org/errata/eid5085 -------------------------------------- Status: Verified Type: Technical Reported by: Balaji Rajagopalan <balajir@juniper.net> Date Reported: 2017-08-11 Verified by: Deborah Brungard (IESG) Section: 6 Original Text ------------- On receipt of the LSP Ping Echo request message, the egress LSR MUST send a BFD Control packet to the ingress LSR, if the validation of the FEC in the LSP Ping Echo request message succeeds. This BFD Control packet MUST set the Your Discriminator field to the discriminator received from the ingress LSR in the LSP Ping Echo request message. The egress LSR MAY respond with an LSP Ping Echo reply message that carries the local discriminator assigned by it for the BFD session. The local discriminator assigned by the egress LSR MUST be used as the My Discriminator field in the BFD session packets sent by the egress LSR. The ingress LSR follows the procedures in [BFD] to send BFD Control packets to the egress LSR in response to the BFD Control packets received from the egress LSR. The BFD Control packets from the ingress to the egress LSR MUST set the local discriminator of the egress LSR, in the Your Discriminator field. The egress LSR demultiplexes the BFD session based on the received Your Discriminator field. As mentioned above, the egress LSR MUST send Control packets to the ingress LSR with the Your Discriminator field set to the local discriminator of the ingress LSR. The ingress LSR uses this to demultiplex the BFD session. Corrected Text -------------- On receipt of the LSP Ping Echo request message, the egress LSR MUST send a BFD Control packet to the ingress LSR, if the validation of the FEC in the LSP Ping Echo request message succeeds. This BFD Control packet MUST set the Your Discriminator field to the discriminator received from the ingress LSR in the LSP Ping Echo request message. The local discriminator assigned by the egress LSR MUST be used as the My Discriminator field in the BFD session packets sent by the egress LSR. The ingress LSR follows the procedures in [BFD] to send BFD Control packets to the egress LSR in response to the BFD Control packets received from the egress LSR. The BFD Control packets from the ingress to the egress LSR MUST set the local discriminator of the egress LSR in the Your Discriminator field. The egress LSR demultiplexes the BFD session based on the received Your Discriminator field. As mentioned above, the egress LSR MUST send Control packets to the ingress LSR with the Your Discriminator field set to the local discriminator of the ingress LSR.The ingress LSR uses this to demultiplex the BFD session. The egress LSR processes the LSP Ping Echo request message in accordance with the procedures defined in [RFC 8029]. The LSP Ping Echo reply message generated by the egress LSR MAY carry the local discriminator assigned by it for the BFD session, as specified in section 6.1. Notes ----- Submitter: It is not clear from the original text which of the following is optional: - The egress MUST send a reply, but the discriminator in the reply is optional - The reply itself is optional Technically, the reply cannot be optional, because the egress needs to report LSP-Ping verification status to the ingress. The proposed text recommends to include BFD discriminator in the reply. This was the intent of the original text. Verifier: The original Errata proposed correcting the last sentences of the second paragraph of Section 6. After discussion in the working group, it was agreed both the second and third paragraphs shown above of Section 6 needed to be revised to the three paragraphs of the corrected text shown above. -------------------------------------- RFC5884 (draft-ietf-bfd-mpls-07) -------------------------------------- Title : Bidirectional Forwarding Detection (BFD) for MPLS Label Switched Paths (LSPs) Publication Date : June 2010 Author(s) : R. Aggarwal, K. Kompella, T. Nadeau, G. Swallow Category : PROPOSED STANDARD Source : Bidirectional Forwarding Detection Area : Routing Stream : IETF Verifying Party : IESG
- [Errata Verified] RFC5884 (5085) RFC Errata System