[Teas] <draft-ietf-teas-te-metric-recording-04>: Review
Vishnu Pavan Beeram <vishnupavan@gmail.com> Mon, 06 June 2016 05:41 UTC
Return-Path: <vishnupavan@gmail.com>
X-Original-To: teas@ietfa.amsl.com
Delivered-To: teas@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id ADA8A12D0A1; Sun, 5 Jun 2016 22:41:31 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.699
X-Spam-Level:
X-Spam-Status: No, score=-2.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com
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 6QRMoTmo7iJq; Sun, 5 Jun 2016 22:41:29 -0700 (PDT)
Received: from mail-vk0-x230.google.com (mail-vk0-x230.google.com [IPv6:2607:f8b0:400c:c05::230]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 667E312B024; Sun, 5 Jun 2016 22:41:26 -0700 (PDT)
Received: by mail-vk0-x230.google.com with SMTP id c66so32001916vkb.3; Sun, 05 Jun 2016 22:41:26 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:from:date:message-id:subject:to; bh=Tjr8FlQzRj7Mgdc680RVEQZaGHKfgMYSBY8mAEEGbQg=; b=JPLoXUPYZeAAeuk55jieTaRKeENUWGcwYuWJMvNysfZOrnSg4AY75S75diaoro6OWv f4YjgvH0chYDhLKr5wz4dDxWMbUSTdSPBTEDxflcC01FarK7KO34V4nyfYzyA3grshjV /bVUKIeVBcGDUqDggWGdt6GdJfYfSD9k5/IrWZdQnX+39hF4AUoCc0GfBCqZ7idDHW27 E9xnuaXTug2mx7MP8a70YpZN0XSc24KjhQgs58MJHZSSz3Ggoy5wdSoMQLPTwkrLY2BK ABKsavPOd69BU+mRcW/1xEGyXnh9SRqC5asA7jt05zStv4cfoSPk6SOZJCu5yUPb/CwY Rvdg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=Tjr8FlQzRj7Mgdc680RVEQZaGHKfgMYSBY8mAEEGbQg=; b=VNS281Qkl6IpPobCZQQ8qOTVQyXwph1vGIkzHagq34jlG+0/XtDwCUTPDlXJ9XpwtT Skz1K0debtkFPG4JChVW44uIDid1WikKrWz4BPDC6HRtT0Vyv7ez2o08DhshOM9Lwr9l fTEpKHmVs1WffLmYyYcZHzqLfbvlwwgBh8dO8LtmBRSCHwUMS/VBpY/jKCcQB/be7Kki FG+ULeHJ1SEwQ4xop7dSOg5T1f+0TYjXY5PDAU+tGUACxPu6A1puDOucMV4fVv6YUXVo fxlTsENeH7hFCauA+r9J2FL6vyrPZME4FNslhMntD4b4qv4mt+XmSTuMrZYorjght4RX ZDjQ==
X-Gm-Message-State: ALyK8tLO6crJDMjLUTxWP6seKBS6Q7C72FM53FMIgV/mnDxCoDVlR4GT1DXy+VgdzVPEWkk72lAx/y/yb57MXw==
X-Received: by 10.31.6.145 with SMTP id 139mr5524017vkg.33.1465191685407; Sun, 05 Jun 2016 22:41:25 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.31.67.141 with HTTP; Sun, 5 Jun 2016 22:41:25 -0700 (PDT)
From: Vishnu Pavan Beeram <vishnupavan@gmail.com>
Date: Mon, 06 Jun 2016 01:41:25 -0400
Message-ID: <CA+YzgTvK7BbTzZ3jXavfAH=Q-mgcTNxsy8f0Sj6pP79rjZAm1w@mail.gmail.com>
To: draft-ietf-teas-te-metric-recording@ietf.org, "teas@ietf.org" <teas@ietf.org>
Content-Type: multipart/alternative; boundary="001a1143d506efc9e405349585f5"
Archived-At: <https://mailarchive.ietf.org/arch/msg/teas/EkvDNY0Sa4wUdlLYtg7fkNon0jA>
Subject: [Teas] <draft-ietf-teas-te-metric-recording-04>: Review
X-BeenThere: teas@ietf.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: Traffic Engineering Architecture and Signaling working group discussion list <teas.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/teas>, <mailto:teas-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/teas/>
List-Post: <mailto:teas@ietf.org>
List-Help: <mailto:teas-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/teas>, <mailto:teas-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 06 Jun 2016 05:41:32 -0000
Authors, WG, Hi! I have reviewed the current version of this document. There are a few items (listed below) that I would like to see get discussed in the WG before taking this document to the next step. (a) Additive vs Non-Additive Attributes: With the protocol extensions proposed by this document, the end-points of an inter-domain LSP can learn (via signaling) a few network-performance attributes from each hop traversed by the LSP. If this inter-domain LSP were to be advertised as a TE-link, then the end-points of this LSP could use this set of "learnt" attribute-lists, apply some policy and come up with a corresponding set of composite attributes that can then be advertised for the TE -ink. This document discusses the collection of 3 attributes — cost, delay and delay variation. Cost and delay can be treated as additive attributes (it needs to be pointed out that some in the past - see CCAMP WG list archives - have expressed concerns on the utility of adding up costs in an inter domain scenario); delay-variation is not an additive attribute. The document does say that the computation of the composite/macro attributes is beyond the scope of the draft. But I would like to hear from the WG if there are any concerns regarding the collection(/use) of any of the attributes discussed in this document. (b) Other Network Performance Attributes: If we do allow the collection of “delay-variation”, then should we also consider allowing the collection of other network performance attributes specified in [RFC7471] and [RFC7810]? (c) Generic “Hop Attribute Collection” mechanism: We have now opened up the door to collect any per-hop TE-attribute via signaling. We already have a generic mechanism to specify attributes that can be applied to each hop [hop-attributes sub-object, RFC7570]. Do we now need a generic mechanism to “collect” attributes from each hop [say, a hop-attributes-collection sub-object]? Or is the mechanism specified in the SRLG-Collect document and in this document acceptable to all? Please do weigh in with your thoughts. Regards, -Pavan ps: I also found a few editorial nits (pasted below) — @Authors, please see if you can take care of them in the next version. *** Editorial Nits: Header: - Update the list of authors/editors in the first page as per the guidance provided in https://tools.ietf.org/html/rfc7322#section-4.1. (please see if you can adhere to the "5 authors" limit; as an alternative, consider having just one or two editors with others listed in the Contributors/Acknowledgements section) 1. Introduction: - substitute /“[DRAFT-ISIS-TE-METRIC]”/ with /“[RFC7810]”/. - substitute /“Consequently, in cases where that an LSP is advertised as a TE-Link,”/ with /“Consequently, in cases where an LSP is advertised as a TE-Link,”/ - The document does have a “Use Cases” section. So, consider removing the following sentence: “Note that specification of the use of the collected cost, delay and delay variation information is outside the scope of this document” 1.1 Use Cases This section needs a scrub. This solution is not needed in all GMPLS scenarios - the initial sentence in 1.1.1 is misleading. You can cleanup a majority of this section if you just say that this is used for inter-domain TE LSPs. 1.1.2 Inter-area tunnels with loose-hops - substitute /“When a LSP is established over multiple IGP-areas using loose hops in the ERO, the ingress node may only has knowledge”/ with /“When a LSP is established over multiple IGP-areas using loose hops in the ERO, the ingress node may only have knowledge ..”/ 2.2 Cost, Delay and Delay Variation Collection - substitute /“Cost and/ or delay and/ or delay variation information is for each hop is added to the Path RRO during Path message processing.”/ with /“Cost and/ or delay and/ or delay variation information is added by each hop to the Path RRO during Path message processing”. - Consider removing the following line [Comment - it doesn’t seem to be adding any value]: The endpoints of the LSP can make use of the collected SRLG information, for example, for routing, sharing and TE link configuration purposes. 9.1 Normative References - substitute /[DRAFT-ISIS-TE-METRIC]/ with /[RFC7810]/. ***
- [Teas] <draft-ietf-teas-te-metric-recording-04>: … Vishnu Pavan Beeram
- Re: [Teas] <draft-ietf-teas-te-metric-recording-0… Zafar Ali (zali)