[mpls] Routing Directorate Review of "Label Switched Path (LSP) and Pseudowire (PW) Ping/Trace over MPLS Network using Entropy Labels (EL)"

"Acee Lindem (acee)" <acee@cisco.com> Wed, 03 August 2016 14:42 UTC

Return-Path: <acee@cisco.com>
X-Original-To: mpls@ietfa.amsl.com
Delivered-To: mpls@ietfa.amsl.com
Received: from localhost (localhost []) by ietfa.amsl.com (Postfix) with ESMTP id 075FE12D5D5; Wed, 3 Aug 2016 07:42:38 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -15.808
X-Spam-Status: No, score=-15.808 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-1.287, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com
Received: from mail.ietf.org ([]) by localhost (ietfa.amsl.com []) (amavisd-new, port 10024) with ESMTP id nZYVlJyXFMC9; Wed, 3 Aug 2016 07:42:36 -0700 (PDT)
Received: from alln-iport-6.cisco.com (alln-iport-6.cisco.com []) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 654BE12D6A5; Wed, 3 Aug 2016 07:42:25 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=5572; q=dns/txt; s=iport; t=1470235345; x=1471444945; h=from:to:cc:subject:date:message-id:content-id: content-transfer-encoding:mime-version; bh=1KkdmOjmN/UOqpB8LQYfzw4NUsRTHzvkTF61sZG9AdM=; b=BUnvVl+PWS/7I4EI8gt6+zpDjCOyPyvF42pjJtm3lm/kJtnsOgaYIWU5 vIBc+VsyA4lb65nj3aLgOj9tcU7yJFtXCybk7z6WcSGktxfFR5tIxeV16 GnpXib/NEwrkkD42z/e8e3k9OHxLyfvGmbIGws5EIU+dbSvzqL+ZKmZ0k Q=;
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DKAgCNAqJX/5RdJa1cg0VWfAEGgnq0H?= =?us-ascii?q?oIPgX0khXkegTA4FAEBAQEBAQFdHAuEZQwXETEUEgEGFgYCHwcCBDAVEgQOiDY?= =?us-ascii?q?OkWudII81AQEBAQEFAQEBASOBAY4TgySCWgWZNAGGF4J8hWuBa06EDYh6jDCDd?= =?us-ascii?q?gEeNoIRHReBNW+HF0V/AQEB?=
X-IronPort-AV: E=Sophos;i="5.28,465,1464652800"; d="scan'208";a="306370593"
Received: from rcdn-core-12.cisco.com ([]) by alln-iport-6.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Aug 2016 14:42:07 +0000
Received: from XCH-RTP-013.cisco.com (xch-rtp-013.cisco.com []) by rcdn-core-12.cisco.com (8.14.5/8.14.5) with ESMTP id u73Eg63N008772 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Wed, 3 Aug 2016 14:42:07 GMT
Received: from xch-rtp-015.cisco.com ( by XCH-RTP-013.cisco.com ( with Microsoft SMTP Server (TLS) id 15.0.1210.3; Wed, 3 Aug 2016 10:42:06 -0400
Received: from xch-rtp-015.cisco.com ([]) by XCH-RTP-015.cisco.com ([]) with mapi id 15.00.1210.000; Wed, 3 Aug 2016 10:42:05 -0400
From: "Acee Lindem (acee)" <acee@cisco.com>
To: "draft-ietf-mpls-entropy-lsp-ping@ietf.org" <draft-ietf-mpls-entropy-lsp-ping@ietf.org>
Thread-Topic: Routing Directorate Review of "Label Switched Path (LSP) and Pseudowire (PW) Ping/Trace over MPLS Network using Entropy Labels (EL)"
Thread-Index: AQHR7ZU00euPM8O74U+tzPtDShPu7g==
Date: Wed, 3 Aug 2016 14:42:05 +0000
Message-ID: <D3C77AFD.7479A%acee@cisco.com>
Accept-Language: en-US
Content-Language: en-US
x-ms-exchange-messagesentrepresentingtype: 1
x-ms-exchange-transport-fromentityheader: Hosted
x-originating-ip: []
Content-Type: text/plain; charset="utf-8"
Content-ID: <DBD919FC93514B47B1563D0061DA663A@emea.cisco.com>
Content-Transfer-Encoding: base64
MIME-Version: 1.0
Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/5nEEDwzrAn_Og86t_OWc-YGKQ04>
Cc: "mpls@ietf.org" <mpls@ietf.org>, Routing Directorate <rtg-dir@ietf.org>
Subject: [mpls] Routing Directorate Review of "Label Switched Path (LSP) and Pseudowire (PW) Ping/Trace over MPLS Network using Entropy Labels (EL)"
X-BeenThere: mpls@ietf.org
X-Mailman-Version: 2.1.17
Precedence: list
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, 03 Aug 2016 14:42:38 -0000


I have been selected as the Routing Directorate reviewer for this draft.
The Routing Directorate seeks to review all routing or routing-related
drafts as they pass through IETF last call and IESG review, and sometimes
on special request. The purpose of the review is to provide assistance to
the Routing ADs. For more information about the Routing Directorate,
please see ​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Although these comments are primarily for the use of the Routing ADs, it
would be helpful if you could consider them along with any other IETF Last
Call comments that you receive, and strive to resolve them through
discussion or by updating the draft.

Document: draft-ietf-mpls-entropy-lsp-ping-03
Reviewer: Acee Lindem
Review Date: 08/03/2016
IETF LC End Date: Not started
Intended Status: Standards Track

    This document is basically ready for publication, but has some minor
issues and nits that should be resolved prior to publication.

This document defines encodings and procedures to allow LSRs supporting
LSP Ping [RFC4379, RFC 6424] and MPLS Entropy Label Forwarding [RFC6790]
steer traffic on all the ECMP paths for the target LSP. The specifications
cover both the initiating LSR and the responding LSR. The document contains
very precise specifications. However, detailed understanding of the
documents is required.

Major Issues:

    I have no major issues with the document.

Minor Issues:

    1. In many cases, the text is missing articles (i.e., “the, “a”, “an).
       Andy Malis has agreed to take a pass at adding these where they are

    2. It seems the order of this document is wrong. I would have expected
       the encodings in sections 7, 8, and 9 to precede the procedures in
       sections 5 and 6.

    3. Similarly, section 10 could be summarized in section 1.3 and,
       the details could be moved to an appendix.

   [RFC4379], [RFC6424] and this document will support IP-based
   Load Balancers and Label-based Load Balancers which limit their hash
   to the first (top-most) or only Entropy Label in the label stack. Other
   use cases (refer to section 10) are out of scope.
    4. RFC 6424 should be a normative reference based on section 1.3 and
       fact that it is updated by this document.

    5. For Associated Label Multipath Information, provide a reference for
       how the 24-bit labels are encoded. Is it the same as {9}?

    6. For Associated Label Multipath Information, don’t the labels
       correspond to the same order as the IP addresses or labels in the
       previous sections? The example is confusing since it alludes to
       the “lowest IP address” which could imply that the associated label
       mapping is based on the value of the address.

    7. In section 6.4, the last bullet on page 12 is confusing to me. Can
       you explain why the '“Label Multipath Information” sections MUST
       be used’? I seem to be missing something here as I would have
       that it would be returned.


    1. In the terminology section, add a reference for [RFC6391] where the
       Flow Label is first referenced.

    2. In section 7, refer to IANA value TBD1. Also, it would improve the
       text if RFC6790 were referenced in the discussion of ELI and EL.
    3. In the IANA section, why is the Entropy Label FEC not first as it is
       in the document?

    4. In section 9, indicate lengths should be 0 when a section is

    5. In section 2, indicate where in RFC 4379, {x, y, and z} are

    6. Please use “e.g., “ and “i.e., “ consistently instead of variants
       such as “ex:”.

    7. In the last paragraph of section 2, “Label Based Load Balancer” is
       listed twice.

    8. In section 6.2, replace “is it not there” with “it is not there”.