IETF Logo Mail Archive

Re: [sfc] TTL field within the NSH base header

"Andrew G. Malis" <agmalis@gmail.com> Thu, 27 April 2017 21:00 UTC

Return-Path: <agmalis@gmail.com>
X-Original-To: sfc@ietfa.amsl.com
Delivered-To: sfc@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 40D08129C49 for <sfc@ietfa.amsl.com>; Thu, 27 Apr 2017 14:00:26 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.698
X-Spam-Level:
X-Spam-Status: No, score=-2.698 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, URIBL_BLOCKED=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 esg605jpuRs7 for <sfc@ietfa.amsl.com>; Thu, 27 Apr 2017 14:00:24 -0700 (PDT)
Received: from mail-it0-x231.google.com (mail-it0-x231.google.com [IPv6:2607:f8b0:4001:c0b::231]) (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 03055129BBE for <sfc@ietf.org>; Thu, 27 Apr 2017 13:56:15 -0700 (PDT)
Received: by mail-it0-x231.google.com with SMTP id g66so25053552ite.1 for <sfc@ietf.org>; Thu, 27 Apr 2017 13:56:14 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=RgO6GjCwfYvVYjBU4LlLzSqEmojc1b0IeppzCvIVG8E=; b=GsPWbueegqHTpyYMG5O9f+5FgtsJFk3X7AGD6uxOKAUzUMnrxpahLfQeyAz+TN/L33 1/UiLwGQ9gAgtt4dFBCKTMK+RfRfD1OZx94njeYmgtq/Ynr1x4RHaCpRlSr1ZdpDaatI 9kvSOILPANgcqj60tbfV4pDSFJCB7wNw+2RZoQvF0TyxuGt9Qdbjc4IBHQB0evuCqSDN jOnOPQAH4cJ/xBdaI4SoZtZSZoxLR9f6+3O/bDlGUhMDTzni93+SWTBg56T6d2Ljdbqy 3mIMyN5iJjq8OjmYFPpMh3SSG7ERXIVc0LZR5Xv8vsragWl0fFRUtfrLMEHlSimHN/yV vHMQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=RgO6GjCwfYvVYjBU4LlLzSqEmojc1b0IeppzCvIVG8E=; b=CgnBhZMd/EMrYM8L6p8AM16s+4ov1GVSxjKoSteyaVfP8GLc4o27XqAK51EOBhofuM eX52F0jhFIbK4/LvoymbWp3620AAmjDa2GCx5EeJkOXsal1PR0m+NNR5d/n+uXKOP15r mQhf77+ZloIp7NQhqcU8d4G0udFoVdlyjGPhkkPNEt6fpI4T7Na54rBrhCLfJr+HBLP1 NnhvZurnl2xjfMs9X2CDqTQSP9xTa4JlAxMgINmhJN2ySk2CVS5/70IFFQ9Z06yGRrpM LUgAD6BKXcpJIBxpXyh0AEXZfhrDnE23Abr0ByytH+HF4oVdsT4yyvYCHm8nBbk5BIGb Oqig==
X-Gm-Message-State: AN3rC/4qqD8+KZgiEEHaAStAX4PrJwDQO8G8dgYbXDxZruh1D4IWbYNk p2RUz25PuEkrsG7HXLhSjZsypxvLyQ==
X-Received: by 10.202.81.196 with SMTP id f187mr3063031oib.126.1493326574307; Thu, 27 Apr 2017 13:56:14 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.182.231.132 with HTTP; Thu, 27 Apr 2017 13:55:53 -0700 (PDT)
In-Reply-To: <CAJn5=KcxP8R7wBWuUohAnhHP9tKqsV+QfQHVAsOVXcpu10tdoQ@mail.gmail.com>
References: <BF1BE6D99B52F84AB9B48B7CF6F17DA3DD5F8E@SJCEML701-CHM.china.huawei.com> <CAA=duU3vKSmH=+nfECeczpUp3+UXSe=F4OHSP4uPg+j7ZQzdTg@mail.gmail.com> <CAJn5=KcxP8R7wBWuUohAnhHP9tKqsV+QfQHVAsOVXcpu10tdoQ@mail.gmail.com>
From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Thu, 27 Apr 2017 16:55:53 -0400
Message-ID: <CAA=duU2a4X_-uhShJvqpqhs-EkQrPCy7NUo7CiziA=DpwKrgLQ@mail.gmail.com>
To: Jim Guichard <jguichard1966@gmail.com>
Cc: James N Guichard <james.n.guichard@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>
Content-Type: multipart/alternative; boundary="001a113b013efed0fe054e2c2f22"
Archived-At: <https://mailarchive.ietf.org/arch/msg/sfc/5bfSzvFdit1MAHF-ExQ1leoDd74>
Subject: Re: [sfc] TTL field within the NSH base header
X-BeenThere: sfc@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: Network Service Chaining <sfc.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/sfc>, <mailto:sfc-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/sfc/>
List-Post: <mailto:sfc@ietf.org>
List-Help: <mailto:sfc-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/sfc>, <mailto:sfc-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 27 Apr 2017 21:00:26 -0000

Jim,

In that case, you need to remove the word “reserved” from the replacement
text.

Cheers,
Andy


On Thu, Apr 27, 2017 at 4:37 PM, Jim Guichard <jguichard1966@gmail.com>
wrote:

> Yes but I also counted the other 3 bits that were reserved and are now
> allocated..
>
> On Thu, Apr 27, 2017 at 4:25 PM Andrew G. Malis <agmalis@gmail.com> wrote:
>
>> Jim,
>>
>> The replacement text says:
>>
>>    There are eight reserved bits in the NSH Base Header. New bits
>>
>>    are assigned via Standards Action [RFC5226].
>>
>> There are now actually five reserved bits.
>>
>> Cheers,
>> Andy
>>
>>
>> On Thu, Apr 27, 2017 at 2:54 PM, James N Guichard <
>> james.n.guichard@huawei.com> wrote:
>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> Dear WG:
>>>
>>>
>>>
>>>
>>>
>>> Having reviewed all of the email discussion on the mailing list it
>>> appears to the chairs that we have consensus to add a TTL field to the NSH
>>> base header. We would like to propose the following changes:
>>>
>>>
>>>
>>>
>>>
>>> Section 3.2:
>>>
>>>
>>> Update figure 2 as follows:
>>>
>>>
>>>
>>>
>>>
>>>      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>>>
>>>
>>>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>
>>>
>>>     |Ver|O|R|    TTL    |   Length  |R|R|R|R|MD Type| Next Protocol |
>>>
>>>
>>>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>
>>>
>>>
>>>
>>>
>>> Add the following text after figure 2:
>>>
>>>
>>>
>>>
>>>
>>> TTL: Service plane time-to-live. An SFF MUST decrement the TTL by a
>>> value of 1 for all NSH packets it receives. Decrementing by a value of 1
>>> from 0 shall result in a TTL value of 63. The default for originating an
>>> NSH packet is a TTL value
>>>
>>> of 63. The decrement SHALL occur before testing for 0. After decrement,
>>> if the TTL is 0, the NSH packet MUST NOT be forwarded.
>>>
>>>
>>>
>>>
>>>
>>> Section 3.4:
>>>
>>>
>>> Update figure 4 to reflect the new base header format as per section 3.2
>>> base header.
>>>
>>>
>>>
>>>
>>>
>>> Section 3.5:
>>>
>>>
>>> Update figure 5 to reflect the new base header format as per section 3.2
>>> base header.
>>>
>>>
>>>
>>>
>>>
>>> Section 12.2.1:
>>>
>>>
>>> Current text is as follows:
>>>
>>>
>>>
>>>
>>>
>>>    There are ten bits at the beginning of the NSH Base Header.  New bits
>>>
>>>
>>>    are assigned via Standards Action [RFC5226].
>>>
>>>
>>>
>>>
>>>
>>>    Bits 0-1 - Version
>>>
>>>
>>>    Bit 2 - OAM (O bit)
>>>
>>>
>>>    Bit 3 - Critical TLV (C bit)
>>>
>>>
>>>    Bits 4-9 - Reserved
>>>
>>>
>>>
>>>
>>>
>>> Replace entire text as follows:
>>>
>>>
>>>
>>>
>>>
>>>    There are eight reserved bits in the NSH Base Header. New bits
>>>
>>>
>>>    are assigned via Standards Action [RFC5226].
>>>
>>>
>>>
>>>
>>>
>>>    Bits 0-1 - Version
>>>
>>>
>>>    Bit 2 - OAM (O bit)
>>>
>>>
>>>    Bit 3 - Reserved
>>>
>>>
>>>    Bits 16-19 - Reserved
>>>
>>>
>>>
>>>
>>>
>>> Section 12.2.3:
>>>
>>>
>>> Current text has the MD-type as 8-bit values.
>>>
>>>
>>>
>>>
>>>
>>> Update text for this section and table 1 to reflect 4-bit values *not*
>>> 8-bit values.
>>>
>>>
>>>
>>>
>>>
>>> *Please review carefully and indicate support for these changes (or any
>>> changes to the suggested text).*
>>>
>>>
>>>
>>>
>>>
>>> Thanks,
>>>
>>>
>>>
>>>
>>>
>>> Jim & Joel
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>>
>>>
>>> sfc mailing list
>>>
>>>
>>> sfc@ietf.org
>>>
>>>
>>> https://www.ietf.org/mailman/listinfo/sfc
>>>
>>>
>>>
>>>
>>
>>
>> _______________________________________________
>>
>> sfc mailing list
>>
>> sfc@ietf.org
>>
>> https://www.ietf.org/mailman/listinfo/sfc
>>
>>

v2.23.0 | Report a Bug | By Email