[mpls] Mirja Kühlewind's No Objection on draft-ietf-mpls-tp-shared-ring-protection-05: (with COMMENT)
Mirja Kühlewind <ietf@kuehlewind.net> Wed, 24 May 2017 13:19 UTC
Return-Path: <ietf@kuehlewind.net>
X-Original-To: mpls@ietf.org
Delivered-To: mpls@ietfa.amsl.com
Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id A4A0D129B0D; Wed, 24 May 2017 06:19:12 -0700 (PDT)
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit
From: Mirja Kühlewind <ietf@kuehlewind.net>
To: The IESG <iesg@ietf.org>
Cc: draft-ietf-mpls-tp-shared-ring-protection@ietf.org, Eric Gray <Eric.Gray@Ericsson.com>, mpls-chairs@ietf.org, Eric.Gray@Ericsson.com, mpls@ietf.org
X-Test-IDTracker: no
X-IETF-IDTracker: 6.51.0
Auto-Submitted: auto-generated
Precedence: bulk
Message-ID: <149563195266.28533.2114103150241285236.idtracker@ietfa.amsl.com>
Date: Wed, 24 May 2017 06:19:12 -0700
Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/6M4rUDuToWmtAx-ZrRpItU22fGE>
Subject: [mpls] Mirja Kühlewind's No Objection on draft-ietf-mpls-tp-shared-ring-protection-05: (with COMMENT)
X-BeenThere: mpls@ietf.org
X-Mailman-Version: 2.1.22
List-Id: Multi-Protocol Label Switching WG <mpls.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/mpls>, <mailto:mpls-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/mpls/>
List-Post: <mailto:mpls@ietf.org>
List-Help: <mailto:mpls-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/mpls>, <mailto:mpls-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 24 May 2017 13:19:13 -0000
Mirja Kühlewind has entered the following ballot position for draft-ietf-mpls-tp-shared-ring-protection-05: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-mpls-tp-shared-ring-protection/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Two technical comments that I think are important to address but do not warrant a discuss: 1) section 5.2: "As shown in Figure 14, when no protection switching is active on the ring, each node MUST send RPS requests with No Request (NR) to its two adjacent nodes periodically." What does periodically mean here? Can you maybe give a number or even a normative statement like "and MUST NOT send more often than every X seconds" to avoid unnecessary congestion...? 2) section 5.1.1: "A ring node which is not the destination of the received RPS message MUST forward it to the next node along the ring immediately." Why would you forward these? I thought you only send messages to your neighbors? Maybe I missed this but is there a use case for this scenario? Otherwise it might be safer to not forward to avoid that messages with a wrong destination node ID circle around forever. If you forward maybe you also need a hop-count to decrease or at least say that messages that are received and have the own node ID as source node ID MUST be dropped...? Further, as mentioned by Ben for a couple of case, some of the uses of normative language in section 5 seems not to be appropriate as they don't specify a concrete implementation action. Please check carefully and change some to lower case instead, e.g. "The MSRP protection operation MUST be controlled with the help of the Ring Protection Switch protocol (RPS). " "The RPS protocol MUST carry the ring status information and RPS requests,.." (this sounds like a requirement on the protocol design but when you implement the protocol as specified there is no way to not do it, so this MUST is unnecessary) "Each node on the ring MUST be uniquely identified by assigning it a node ID." (also requirement-like; the MUST in the next sentence is the important one) "When a node detects a failure and determines that protection switching is required, it MUST send the appropriate RPS request in both directions to the destination node." "MSRP mechanism SHOULD support multiple protection switches in the ring, resulting in the ring being segmented into two or more separate segments. " "The first three RPS protocol messages carrying new RPS request SHOULD be transmitted as fast as possible." (Again the later SHOULD is the more important one) There may be more…
- [mpls] Mirja Kühlewind's No Objection on draft-ie… Mirja Kühlewind