IETF Logo Mail Archive

draft-ietf-rtgwg-segment-routing-ti-lfa Table 1 questions

Stewart Bryant <stewart.bryant@gmail.com> Mon, 22 July 2019 15:59 UTC

Return-Path: <stewart.bryant@gmail.com>
X-Original-To: rtgwg@ietfa.amsl.com
Delivered-To: rtgwg@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B2F8012012B; Mon, 22 Jul 2019 08:59:53 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.999
X-Spam-Level:
X-Spam-Status: No, score=-1.999 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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, 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 gViAEGrDYl89; Mon, 22 Jul 2019 08:59:52 -0700 (PDT)
Received: from mail-ua1-x92a.google.com (mail-ua1-x92a.google.com [IPv6:2607:f8b0:4864:20::92a]) (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 07958120052; Mon, 22 Jul 2019 08:59:49 -0700 (PDT)
Received: by mail-ua1-x92a.google.com with SMTP id c4so15509868uad.1; Mon, 22 Jul 2019 08:59:48 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:message-id:date:user-agent:mime-version :content-language:content-transfer-encoding; bh=y+xL1OiYviQGUMXMDo9X4BQA6eQZSESj1xFUMhxg+SE=; b=fKIZN41yLwvW5oZxYQsYbSFrJWOElRWrtZI9dLPqCrAIjOB+LZ6m5Tt00PSHFx15HV wb33pi+pLMSm6olyVavCGkZjAUqQqj17u/cW0opqcgyJItphWjv2Gsq+crXMdevkgXNz kHyhMC9ae8kVv9ibc2LqCdnlFaxtrqWMURfqxiqevhM45Wcr+m3Ludj2RQV6lWuGWFkO WfFd5z4jquB/6etvjBuBETfjSHWRdrxmLcHm4Md55rGEpm7RxGR0Mqph0ewSITl9Kx/l AV4PVFCVrM40Qld6tBo2FTTbn2lMtZWfGitXfWR5B4VloFsQ4nMtgRapBZYzq4VXbAN6 qOgg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:message-id:date:user-agent :mime-version:content-language:content-transfer-encoding; bh=y+xL1OiYviQGUMXMDo9X4BQA6eQZSESj1xFUMhxg+SE=; b=GVj+ggYlu1dhVQspljrZnnCU+trODnVeum8uBM7Y5Rhy8HQw+MM+CVKfKKMAPEaSBy fa6Ni8jbdxK2VYmr1sdDSmVOG61rRMIb3q0EFgTrAdqG1SV0n3aKGUrkiXNYBSKZGmF0 2HUj8WtBspGdMsyp/5+R1qk0jDktnNRf44CXy6Ds1WomJYmqYC0nk9iKJgcSNFRLF1/M dclWwFEnERe+FQ+cqOxZ+zzmbDllQLHZFNog7YagG7yHeubaBTXSUfXAF4gNcdjB32bK 8ERU9jcBhL9MEdPgmDkwz4+CGpDu/4l7Mc9Io204vw+VXm+rXMYs4ye1Oz4q5Im7aen9 dlIA==
X-Gm-Message-State: APjAAAXAyKsMf3+Gdgg+b2Lqv/460TIYPyvsbJoJwbWT0VhqEcTIyENF RNf5FIG9UtH3OOl8o/fAxPe2wrEuTZQ=
X-Google-Smtp-Source: APXvYqyW8mEyENozuFihZj6FPZwGrBsdWhw4cdgFRSl9fO/ive38oMHJh7EXeEA9h2kpYNCat0IySw==
X-Received: by 2002:ab0:6896:: with SMTP id t22mr26510109uar.127.1563811187787; Mon, 22 Jul 2019 08:59:47 -0700 (PDT)
Received: from [31.133.130.171] (dhcp-82ab.meeting.ietf.org. [31.133.130.171]) by smtp.gmail.com with ESMTPSA id b187sm24433456vkf.54.2019.07.22.08.59.47 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 22 Jul 2019 08:59:47 -0700 (PDT)
From: Stewart Bryant <stewart.bryant@gmail.com>
To: rtgwg@ietf.org, draft-ietf-rtgwg-segment-routing-ti-lfa@ietf.org
Subject: draft-ietf-rtgwg-segment-routing-ti-lfa Table 1 questions
Message-ID: <b0799dbf-f0fc-d1d0-543c-38049141ce9b@gmail.com>
Date: Mon, 22 Jul 2019 16:59:47 +0100
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"; format="flowed"
Content-Language: en-GB
Content-Transfer-Encoding: 7bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/rtgwg/KIE9udUZ8PIWVh10QCHBi9A_Wa8>
X-BeenThere: rtgwg@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Routing Area Working Group <rtgwg.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/rtgwg>, <mailto:rtgwg-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/rtgwg/>
List-Post: <mailto:rtgwg@ietf.org>
List-Help: <mailto:rtgwg-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/rtgwg>, <mailto:rtgwg-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 22 Jul 2019 15:59:54 -0000

I would like to understand what Table 1 in 
draft-ietf-rtgwg-segment-routing-ti-lfa is telling us.

It uses the terms links and circuits without distinguishing between the 
two. I could speculate that a circuit is a group of links, but then the 
ratio of nodes to circuits in T1 seems far too low at less than 1:1 in 
network T1.

Then the node to link ratio sounds quite high with fan outs of 84:1 in T2.

Please could you explain what you mean by circuits and links in this table.

What I would like to know is the average ratio of nodes to neighbours, 
and the number of parallel links per neighbour.

Best regards

Stewart

v2.23.0 | Report a Bug | By Email