IETF Logo Mail Archive

Re: [mpls] [Bier] Encapsulation first nibble

Ignas Bagdonas <ibagdona.ietf@gmail.com> Thu, 19 March 2015 01:51 UTC

Return-Path: <ibagdona.ietf@gmail.com>
X-Original-To: mpls@ietfa.amsl.com
Delivered-To: mpls@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6ED011A7D83; Wed, 18 Mar 2015 18:51:26 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2
X-Spam-Level:
X-Spam-Status: No, score=-2 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, SPF_PASS=-0.001] autolearn=ham
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 pI1bF-vJ616d; Wed, 18 Mar 2015 18:51:24 -0700 (PDT)
Received: from mail-wi0-x22f.google.com (mail-wi0-x22f.google.com [IPv6:2a00:1450:400c:c05::22f]) (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 90BCA1A702E; Wed, 18 Mar 2015 18:51:24 -0700 (PDT)
Received: by wifj2 with SMTP id j2so55526740wif.1; Wed, 18 Mar 2015 18:51:23 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; bh=ToDwbz0AjYZtl2HE+C0xwyTaOQYyXD3HRrOpFGpirEk=; b=Z5gJdw+SaHaa0nYxKmqK2GRtYiK1yVrQ7wQBPh2fXaA9WhmRbj0QPHpOZSEVhRxvza rnG3uvGKU/8BHwkOfAB7TcOAahy8yAN2K1YVlVy/IP9VBSTI85lVtTORph3pwRIAHw/6 8Y5iHfee4aDs1irUFufd/DUdBsDWtYRNAi1JcTCFkiPXGLbxWWIcm2Vztf+7+xkD67+F lbbC99X0EfpzZiCO5/bAQoHB+VptwzYJh3vZTT9tgAMZSNXHP8HMtjzjKRpevWPry2f1 F8oL6JkAwEfK8MDOVMTLMY6rFFDyoljH9XOcBE2WjNI24BYN94VbyZYJ8KYEJbQ8iMWx T9Bw==
X-Received: by 10.194.75.168 with SMTP id d8mr149713355wjw.87.1426729883426; Wed, 18 Mar 2015 18:51:23 -0700 (PDT)
Received: from [192.168.101.5] (host86-143-211-157.range86-143.btcentralplus.com. [86.143.211.157]) by mx.google.com with ESMTPSA id m4sm26744504wjb.25.2015.03.18.18.51.21 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 18 Mar 2015 18:51:22 -0700 (PDT)
Message-ID: <550A2B98.4010409@gmail.com>
Date: Thu, 19 Mar 2015 01:51:20 +0000
From: Ignas Bagdonas <ibagdona.ietf@gmail.com>
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Thunderbird/31.5.0
MIME-Version: 1.0
To: Xuxiaohu <xuxiaohu@huawei.com>, "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>, Antoni Przygienda <antoni.przygienda@ericsson.com>, "stbryant@cisco.com" <stbryant@cisco.com>, Eric Rosen <erosen@juniper.net>, BIER <bier@ietf.org>, IJsbrand Wijnands <ice@cisco.com>
References: <55033E87.3030305@juniper.net> <5503403E.4050304@cisco.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE0831CB77@NKGEML512-MBS.china.huawei.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE0831CBB2@NKGEML512-MBS.china.huawei.com> <2E4BB27CAB87BF43B4207C0E55860F1827D3C5@eusaamb103.ericsson.se> <BY2PR05MB079ACD3AE28CC48B48C789ED4030@BY2PR05MB079.namprd05.prod.outlook.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE0831CCE9@NKGEML512-MBS.china.huawei.com> <BY2PR05MB07904EDBB62DAF1E826E107D4000@BY2PR05MB079.namprd05.prod.outlook.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE0831CEFD@NKGEML512-MBS.china.huawei.com>
In-Reply-To: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE0831CEFD@NKGEML512-MBS.china.huawei.com>
Content-Type: text/plain; charset="gbk"; format="flowed"
Content-Transfer-Encoding: 7bit
Archived-At: <http://mailarchive.ietf.org/arch/msg/mpls/sZqtC-3NXoVqy2IqvIlfQYecs78>
Cc: "mpls@ietf.org" <mpls@ietf.org>, "sfc@ietf.org" <sfc@ietf.org>
Subject: Re: [mpls] [Bier] Encapsulation first nibble
X-BeenThere: mpls@ietf.org
X-Mailman-Version: 2.1.15
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: <http://www.ietf.org/mail-archive/web/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: Thu, 19 Mar 2015 01:51:26 -0000

Hi,

 > Since the control word is optional when transporting Ethernet over 
MPLS, I wonder whether the idea of reserving the first nibble value of 
15 is feasible in practice.

Not using a control word for ethernet PW is painful from operational 
perspective. Many deployed platforms will look past the labels without 
much context and if they happen to find 4 or 6 there, the behavior will 
range from blindly believing that it is in fact IPv4 or IPv6 packet to 
trying to validate certain fields or even checksums. Control word helps 
here, and if both sides have support, it should be used.

Ignas

v2.23.0 | Report a Bug | By Email