Re: [Bier] bier-frr w/ a single bift

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Wed, 17 March 2021 15:23 UTC

Return-Path: <zzhang@juniper.net>
X-Original-To: bier@ietfa.amsl.com
Delivered-To: bier@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E195B3A1016 for <bier@ietfa.amsl.com>; Wed, 17 Mar 2021 08:23:10 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.856
X-Spam-Level:
X-Spam-Status: No, score=-2.856 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.248, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_BLOCKED=0.001, RCVD_IN_MSPIKE_H5=-1, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, URI_NOVOWEL=0.5] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=juniper.net header.b=u5JVhHQW; dkim=pass (1024-bit key) header.d=juniper.net header.b=O5E3sg1E
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 asQxyd9z0Gcd for <bier@ietfa.amsl.com>; Wed, 17 Mar 2021 08:23:09 -0700 (PDT)
Received: from mx0b-00273201.pphosted.com (mx0b-00273201.pphosted.com [67.231.152.164]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3DBB53A101C for <bier@ietf.org>; Wed, 17 Mar 2021 08:23:09 -0700 (PDT)
Received: from pps.filterd (m0108160.ppops.net [127.0.0.1]) by mx0b-00273201.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 12HFEVqg029218; Wed, 17 Mar 2021 08:23:08 -0700
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=juniper.net; h=from : to : subject : date : message-id : references : in-reply-to : content-type : content-transfer-encoding : mime-version; s=PPS1017; bh=9lt2D9fiBibAiIES8IlW82oy4V9f+u6pTMAGGQYuLPo=; b=u5JVhHQWcVzuqyLq8Sv7eQp2nWdcc2ts3soEfL6OIGDajRfCYLGw+NUwkCzIbJI6MokD VBqtqKh2mblaDUOhEPKw8aDN5j7ktLIIRGm+QxUEkT7/E/RjWTRv/99/RjlnMIJYdUxT /yPwge7rNWbja3jXt3Atm+P52qi6bCdw8txAYzVaHP1tvm13u+1KIgg/Eq2h1Hna5hty NEO/sDBUxrRWjNltfLtT684uOOZrcYaPSzu/mbkdwz1Wg/wj6bWXRfUn6ayRVyBnPL1R FPOgVmHizCneliiZw1bIE33QkQ78xkXRukSu+xLluFRNXavPRNcBjqfBc35KO+mliJsx Kg==
Received: from nam12-bn8-obe.outbound.protection.outlook.com (mail-bn8nam12lp2171.outbound.protection.outlook.com [104.47.55.171]) by mx0b-00273201.pphosted.com with ESMTP id 37aawf4qk4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 17 Mar 2021 08:23:08 -0700
ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=ASwnInbC6S7ifqO39d0hC0zr5ANnyB4P75R3cswesqYC4LquRZu8IXCHRcxanAEw91RfjFp/LMRjCI+JzDGOsw6a4PEtfOOtAllPCv6fWYVMBEOxfQx85BEWpnXs4zV3+zYIr3Ph884s8owY+cz7lh12/aS4nODKMJfOaWavVgImWlBeLkzcYl5P1Fg9G5Bi7aMqZ8ALvl9jkc4ql/T0zQz+/NSSN50kG0IRCmiWCh9NO5Mffct0MipyTBT4gB/3Ge0hdDbrgZQORBIk/YtWhMbKSgxdFnQpJqnO1ovbLXAUy/+73hl78eL4dhTu1DyzO202vKfxeJxoGuo7pdK3Lg==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=9lt2D9fiBibAiIES8IlW82oy4V9f+u6pTMAGGQYuLPo=; b=kfehii+fJWOWfFKuuarEg0VihRs8/Soj9mBRJx0U0wXf0Cv/yL/1Xw/ywTsDnuS8zEONExPHe8lw0h56VzUQStSrcFOOAhNVDk2JY8Ttx4GlCXytOS9gWx0V2HM8t6D/o+8jD6b/gSDqm/H3uLBiokIY4hjhEcbO5EZbNZcJAqvuT2GMutzt/k/w3PEeQ9vFIqblP6ClHdLINi9NwQH3NymlhZureokhMZAqymtHVAYJoeFBh/yHxr3ogZHsOoe2AuBpQLic7pjI6o83aY8ppBVVqv7XMe7X8L0Uj8Rh+DLt/D94sMOaL2HqUeCPNoIvwVMkQOk/3StQfIfltfvz6A==
ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=juniper.net; dmarc=pass action=none header.from=juniper.net; dkim=pass header.d=juniper.net; arc=none
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=juniper.net; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=9lt2D9fiBibAiIES8IlW82oy4V9f+u6pTMAGGQYuLPo=; b=O5E3sg1EsSzUsxwNm1/p+GgPann9RJb2+PhaHynnOSl0Y8RX+iDkmYksJK5s8wJ+vHBDiux6EbCf8CcQx7BUzY3rehdLwaEOsXsTLbbrzIYdW1ukZt96W58o1LvU+Kqi23Lk0DGkpT5MIvb8PSayCnXh6uJ8I26L+pjmaZ3x+10=
Received: from MN2PR05MB5981.namprd05.prod.outlook.com (2603:10b6:208:c3::15) by MN2PR05MB6464.namprd05.prod.outlook.com (2603:10b6:208:db::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3955.10; Wed, 17 Mar 2021 15:23:06 +0000
Received: from MN2PR05MB5981.namprd05.prod.outlook.com ([fe80::203e:7f1f:be91:161c]) by MN2PR05MB5981.namprd05.prod.outlook.com ([fe80::203e:7f1f:be91:161c%6]) with mapi id 15.20.3955.012; Wed, 17 Mar 2021 15:23:05 +0000
From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: Michael Menth <menth@uni-tuebingen.de>, BIER WG <bier@ietf.org>
Thread-Topic: [Bier] bier-frr w/ a single bift
Thread-Index: AQHXGzq5i4LS5YB1Dkazl82bFc+GpKqIRl0w
Date: Wed, 17 Mar 2021 15:23:05 +0000
Message-ID: <MN2PR05MB59812FC914E61D60D3E7AC0FD46A9@MN2PR05MB5981.namprd05.prod.outlook.com>
References: <0ce6aef0-1370-bc4e-42e8-08aab268847a@uni-tuebingen.de>
In-Reply-To: <0ce6aef0-1370-bc4e-42e8-08aab268847a@uni-tuebingen.de>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
dlp-product: dlpe-windows
dlp-version: 11.6.0.76
dlp-reaction: no-action
msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ActionId=de437d82-f80a-449c-937a-194c748484c2; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ContentBits=0; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Method=Standard; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Name=0633b888-ae0d-4341-a75f-06e04137d755; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2021-03-17T15:01:30Z; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SiteId=bea78b3c-4cdb-4130-854a-1d193232e5f4;
authentication-results: uni-tuebingen.de; dkim=none (message not signed) header.d=none;uni-tuebingen.de; dmarc=none action=none header.from=juniper.net;
x-originating-ip: [71.248.165.31]
x-ms-publictraffictype: Email
x-ms-office365-filtering-ht: Tenant
x-ms-office365-filtering-correlation-id: 946d77a2-c4dd-4f58-02c6-08d8e958902a
x-ms-traffictypediagnostic: MN2PR05MB6464:
x-microsoft-antispam-prvs: <MN2PR05MB6464167EF24B45F77F07533FD46A9@MN2PR05MB6464.namprd05.prod.outlook.com>
x-ms-oob-tlc-oobclassifiers: OLM:8273;
x-ms-exchange-senderadcheck: 1
x-microsoft-antispam: BCL:0;
x-microsoft-antispam-message-info: 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
x-forefront-antispam-report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:MN2PR05MB5981.namprd05.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(136003)(39860400002)(376002)(346002)(396003)(366004)(53546011)(71200400001)(6506007)(478600001)(9686003)(66476007)(966005)(26005)(66556008)(8676002)(33656002)(5660300002)(66946007)(2906002)(66446008)(110136005)(76116006)(8936002)(7696005)(316002)(83380400001)(55016002)(86362001)(186003)(52536014)(64756008); DIR:OUT; SFP:1102;
x-ms-exchange-antispam-messagedata: =?us-ascii?Q?NW/xoWotg/quhdrJjuOCGzwwWjsZJX/gU/YKu8Ve4G3lyebNYU0tNlbW3jJd?= =?us-ascii?Q?3FJ5Ciz1v10wrws46LGP6OJU2Zp2roiwIpmRsJzJ6QnoGxMZMohNho6xJrxf?= =?us-ascii?Q?cbN8lqtv5WY+zmhwxFaR8R0HveOwwI2DRSVyV+Gx7yau+0ea8tzjR30cPOiy?= =?us-ascii?Q?k8BkJoKlw9q8wGYOH+jrxOgyvJzGoz4VLPdzqlrr0PjKyx8P/zkwcbNhwa8k?= =?us-ascii?Q?QEmkWIdkfykId15FCZ57Lr2ZcUvOwDrKDJPC3GDAQYDEtEFx554m7CUBv14f?= =?us-ascii?Q?4kVFGE6i8RnS3n2lYcaNJH6XkKnwmqCVdpPenFOgLR8yCqYPhjTRIDG4B/+t?= =?us-ascii?Q?hbw++lPEWC0S7D2W3nLtaMtLRzSCVbMJheoXdZiMhkRsfGF+iD8MVaP/o86l?= =?us-ascii?Q?NyGu2fmlfjpXCIRWkuuqG9N99DG+dgkKKXbOr637+L3yTPFSkhrf9DDxwPAz?= =?us-ascii?Q?/VFFDRcnIi6JKyFfnNiJAWjyXvmuCwbDY8N67eQCZTuI+D2VKs7jmONyPwtU?= =?us-ascii?Q?bYexbhZscpNe7jM2nsMmwPFq99MLLQNr3cGkxFM3rLHnJGbYVAWgFukPZCPY?= =?us-ascii?Q?NLuMEfuIx9UVk6g5eyVb2dICYCePmqyNUQvO8CGBSJ61LfWTceS7agnh6bhc?= =?us-ascii?Q?rWY+Kx7II8t4LrwzhlaCVtiVIMY/oKX2Yo8SnSWp7bxenFsTe1FH3meHTIvU?= =?us-ascii?Q?8REw4l4E+Upb7c4wzTIcpeTev5e9eRDZCihdFGFT78xCxwQZOi90wCuhh2tI?= =?us-ascii?Q?1JYxPc83gWp4DTstxyZrsvaM27hnZvv3qwlcwGnnq7AErDxV84qkQKYJaA5d?= =?us-ascii?Q?2vdTgqS8wIa8/2msJfQG8kiCl8plysV+zloDFFc1xgmhyVN/IuErFRFLUlgo?= =?us-ascii?Q?5PepCG1cHa0J0v3J/864wZ+9EmG7kA6dzZv8pWk+jrvBN84cBkJ5jVknqgYC?= =?us-ascii?Q?cRPj14cCqLuFd+s6qg8mmGEzuWnnMgmgmCfvbGEDWa5aCTkinr6aMcTbsFkP?= =?us-ascii?Q?vGtDtW//v3YDVsJ4rP7gkN+cSFsYvvgvLILOzcXJAnoeRoyl3v/eLn+8zRVh?= =?us-ascii?Q?r4lW4TOg1Fd8hSVAy5kRqthpEkj5L0O3PXxQVgRjom9kq3afX+eWNqqL1Gkr?= =?us-ascii?Q?YMMLvQ9seTZ91VKIvAJQJnxG3/kKtWCVhOvIYxYDUdN81QtgwNuHV2vnjLiJ?= =?us-ascii?Q?k3BZkpHFRE+0MRLdW8ChZLZuscpSuHWtB+BdUFmNJN4ZeIhFt+uktE/bA0Ld?= =?us-ascii?Q?aVOvx43g45ZIj4WQv5M9vEv0ISszKl9zb2cjfL4CBRDh+s0HPO96eTTjg7xy?= =?us-ascii?Q?qIWP4g/67PfP4ZisV9Ghduqf?=
x-ms-exchange-transport-forked: True
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-OriginatorOrg: juniper.net
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: MN2PR05MB5981.namprd05.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 946d77a2-c4dd-4f58-02c6-08d8e958902a
X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Mar 2021 15:23:05.5592 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: YwGXVruazeYtfclczOo1CvM+BryQ7gmm5fDZqE7/4opz10cj2fP91OV7s3oN1wJVuunLiB75EGu1s9okxR7MFA==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR05MB6464
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369, 18.0.761 definitions=2021-03-17_10:2021-03-17, 2021-03-17 signatures=0
X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 phishscore=0 suspectscore=0 bulkscore=0 impostorscore=0 mlxlogscore=999 priorityscore=1501 mlxscore=0 spamscore=0 clxscore=1015 malwarescore=0 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2103170111
Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/yCHzhEO0VgUXlKgmCGyAwc-hIWM>
Subject: Re: [Bier] bier-frr w/ a single bift
X-BeenThere: bier@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: "\"Bit Indexed Explicit Replication discussion list\"" <bier.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/bier>, <mailto:bier-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/bier/>
List-Post: <mailto:bier@ietf.org>
List-Help: <mailto:bier-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/bier>, <mailto:bier-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 17 Mar 2021 15:23:11 -0000

Michael clarified that the "duplicates" does not mean a BFER will receive duplicates, but that a packet may be sent out of a link multiple times - once for normally forwarded traffic and once for FRR'ed traffic. Given that ambiguity, let me call it "redundant" instead.

If the backup branch is the alternative path to the same BFR nbr as in the primary branch, then indeed you could send out redundant copies. If the backup branch is the alternative path to the BFER, and if the backup-nbr's F-BM also includes BFERs whose normal path is through the same nbr, then redundant copy won't happen only if one of the affected BFERs happens to have a lower id than the non-affected BFERs (that go through the same "backup" nbr).

I don't think we need to worry about that redundant copy even if it happens in the latter case (backup branch is an alternative path to the BFER) - it is transient anyway. In other words, condition 2) is not really necessary.

Jeffrey

-----Original Message-----
From: BIER <bier-bounces@ietf.org> On Behalf Of Michael Menth
Sent: Wednesday, March 17, 2021 10:35 AM
To: BIER WG <bier@ietf.org>
Subject: [Bier] bier-frr w/ a single bift

[External Email. Be cautious of content]


Hi all,

one of the advantages of LFA-based bier-frr is that duplicates may be
avoided. However, I think this is only true if we have either

1) failure-spedific bifts (which is not preferred?)

or

2) the possibility to first process BFERs which are affected by a failure

If assumption 2) is acceptable, I think a single-bift draft for all
bier-frr solution is feasible.

Comments?

Regards

Michael

--
Prof. Dr. habil. Michael Menth
University of Tuebingen
Faculty of Science
Department of Computer Science
Chair of Communication Networks
Sand 13, 72076 Tuebingen, Germany
phone: (+49)-7071/29-70505
fax: (+49)-7071/29-5220
mailto:menth@uni-tuebingen.de
https://urldefense.com/v3/__http://kn.inf.uni-tuebingen.de__;!!NEt6yMaO-gk!QgEyleDd8rFwSesZlYNnOW6nNZZcFvvN00x5qyJv2rIewxMirxNfzN0unVfUToR7$

_______________________________________________
BIER mailing list
BIER@ietf.org
https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/bier__;!!NEt6yMaO-gk!QgEyleDd8rFwSesZlYNnOW6nNZZcFvvN00x5qyJv2rIewxMirxNfzN0unXKTPyhq$

Juniper Business Use Only