Re: [trill] I-D Action: draft-ietf-trill-directory-assist-mechanisms-08.txt

Donald Eastlake <d3e3e3@gmail.com> Wed, 02 November 2016 14:26 UTC

Return-Path: <d3e3e3@gmail.com>
X-Original-To: trill@ietfa.amsl.com
Delivered-To: trill@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8B06912967A for <trill@ietfa.amsl.com>; Wed, 2 Nov 2016 07:26:25 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.45
X-Spam-Level:
X-Spam-Status: No, score=-2.45 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=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 XzhhCr2a2eDG for <trill@ietfa.amsl.com>; Wed, 2 Nov 2016 07:26:24 -0700 (PDT)
Received: from mail-it0-x230.google.com (mail-it0-x230.google.com [IPv6:2607:f8b0:4001:c0b::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 D593F12962C for <trill@ietf.org>; Wed, 2 Nov 2016 07:26:23 -0700 (PDT)
Received: by mail-it0-x230.google.com with SMTP id q124so39745443itd.1 for <trill@ietf.org>; Wed, 02 Nov 2016 07:26:23 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=+k/9B2Kkm347srgwgqotYJkv5BOM6jkGc63UgyAGtXc=; b=awFVMTD00nMRw4XJSaS29jc9PIocR8K2P8ZPU9NZLcu9dDTg1nZ6vYWdVjO61aJf8A GFtXVOZMw1PradfT3R0y30SO1r9f0yhhUMtx+0CY0kzFITl0n7NrtmHddowNKayF6nmc qOJS4CfqjKvmjbD/nnZk6RTLBRgD937U6KxEuiepBkPwRI9sXSkfhoO2T2mW8ON67mrU tD+L1xByrZj6jVrRDfmGVnYyzjsjwGEgxvFTtSHFL5yuXwVJM1+ieSlG7rt1ZzpF755y v6SkeL+C4VofANNa00ew572fJTzRu+uuw2cbG36UMPVm3iMlGhPgqqoEgjTshcZl2eAR 7pig==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=+k/9B2Kkm347srgwgqotYJkv5BOM6jkGc63UgyAGtXc=; b=U8uYWwlMKaJJSUKwz43eteWOiI8QF0h81szFcVlQYtmbVH7gTUve0FmXRqa0VMLqc1 EkxQaBW3AZ2gFnrBoDJNPqDN9tEVRuO0m8OMrl2k6Mj6gGJFHkv/5RlScfEZxQq/ZgMy DyYeVsbI/xgzgcnpg1tlCncd0IRNyxLPqUxCM9KDwzblJ/l711cQ8Qm0lAd6eMcU4ulz THBgHIWCOpYYhD6F/ptdpggJ0HyXsDsHoEWdlzB/sU+oLJ5m9TqYloI+wHHscqYqo/a0 qaAFhTQBGt8DYIpAe2fVcChMqiXUqeZtm3h45GvSATFD3sEZHFDqq8Iwy8s8I5rBttLa mS+w==
X-Gm-Message-State: ABUngvfUqBCqBDcMlfCTf5FhoZIQZZ6CBw1hPRPTDM7Dk7qe1lYhC80CvakhkP0dQ/DmYlW9f/zSveaDXjvxoQ==
X-Received: by 10.36.116.150 with SMTP id o144mr2822545itc.7.1478096782705; Wed, 02 Nov 2016 07:26:22 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.107.163.136 with HTTP; Wed, 2 Nov 2016 07:26:07 -0700 (PDT)
In-Reply-To: <147794830452.23225.17438765481734276337.idtracker@ietfa.amsl.com>
References: <147794830452.23225.17438765481734276337.idtracker@ietfa.amsl.com>
From: Donald Eastlake <d3e3e3@gmail.com>
Date: Wed, 2 Nov 2016 10:26:07 -0400
Message-ID: <CAF4+nEG81Me8Wo9Uy+Vw+ahazmRpzUz9=vs0Ue5Q=vZesuGwmA@mail.gmail.com>
To: "trill@ietf.org" <trill@ietf.org>
Content-Type: text/plain; charset=UTF-8
Archived-At: <https://mailarchive.ietf.org/arch/msg/trill/EENUWFb2YV_P3uQ-AGtd2mDgwlA>
Subject: Re: [trill] I-D Action: draft-ietf-trill-directory-assist-mechanisms-08.txt
X-BeenThere: trill@ietf.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: "Developing a hybrid router/bridge." <trill.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/trill>, <mailto:trill-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/trill/>
List-Post: <mailto:trill@ietf.org>
List-Help: <mailto:trill-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/trill>, <mailto:trill-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 02 Nov 2016 14:26:25 -0000

Hi,

This -08 version of draft-ietf-trill-directory-assist-mechanisms has
significant technical changes, although the amount of text
changed/added from version -07 is not that large.

There were two major problems in version -07:

(1) The mechanism it had for hosting a Pull Directory on an end
station almost worked but it lacked any concept of monitoring
adjacency between such an end station and the edge RBridge that was
proxying for it to provide its Pull Directory service to the rest of
the campus. In particular, there was no way if, for example, the end
station crashed, that the edge RBridge would promptly learn of this.
If the end station has crashed or is no longer accessible from the
edge RBridge then directory information pulled from the end station
can no longer be updated and might be stale.

(2) Both draft-ietf-trill-directory-assisted-encap and
draft-ietf-trill-smart-endnodes assume that a specialize end station
can access a Pull Directory (perhaps one on a directly connected edge
RBridge or perhaps even one elsewhere in the campus). But, in fact,
there is no way provided in
draft-ietf-trill-directory-assist-mechanisms to do this.

To fix these problems, version -08 has a significant revised Section
3.5 and a new Section 5. (The old Section 5 is now Section 6 and
similarly for previous sections after 5.)

The new Section 5 specifies a "TRILL ES-IS" mechanism to establish and
monitor adjacency between edge RBridges and cooperating end stations
on the same link through a modified version of TRILL IS-IS.

The modified Section 3.5 specifies how to host a Pull Directory on and
end station and how an end station can access an edge RBridge hosted
Pull Directory on the same link. TRILL ES-IS is used to advertise the
availability of such Pull Directories reducing the need for
configuration in line with TRILL's philosophy of zero/minimum
configuration. (Version -07 had no mechanism for an end station hosted
Pull Directory to announce itself.)

This version -08 is believe to also resolve all or most of the
comments from Joel Halpern's Routing Directorate review of this draft
some months ago. I will send a subsequent message to him copied to the
WG.

Thanks,
Donald
===============================
 Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
 155 Beaver Street, Milford, MA 01757 USA
 d3e3e3@gmail.com


On Mon, Oct 31, 2016 at 5:11 PM,  <internet-drafts@ietf.org>; wrote:
>
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Transparent Interconnection of Lots of Links of the IETF.
>
>         Title           : TRILL: Edge Directory Assist Mechanisms
>         Authors         : Donald Eastlake
>                           Linda Dunbar
>                           Radia Perlman
>                           Yizhou Li
>         Filename        : draft-ietf-trill-directory-assist-mechanisms-08.txt
>         Pages           : 53
>         Date            : 2016-10-31
>
> Abstract:
>    This document describes mechanisms for providing directory service to
>    TRILL (Transparent Interconnection of Lots of Links) edge switches.
>    The directory information provided can be used in reducing multi-
>    destination traffic, particularly ARP/ND and unknown unicast
>    flooding. It can also be used to detect traffic with forged source
>    addresses.
>
>
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-trill-directory-assist-mechanisms/
>
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-ietf-trill-directory-assist-mechanisms-08
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-trill-directory-assist-mechanisms-08
>
>
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
> _______________________________________________
> trill mailing list
> trill@ietf.org
> https://www.ietf.org/mailman/listinfo/trill