[Bier] Comments on about PCEP and BIER

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Thu, 11 November 2021 16:55 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 106AA3A0CCB for <bier@ietfa.amsl.com>; Thu, 11 Nov 2021 08:55:50 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.101
X-Spam-Level:
X-Spam-Status: No, score=-2.101 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, 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=juniper.net header.b=MDRhiFdu; dkim=pass (1024-bit key) header.d=juniper.net header.b=Up/CYgAV
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 ArFcGX_GEoCN for <bier@ietfa.amsl.com>; Thu, 11 Nov 2021 08:55:45 -0800 (PST)
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 739993A0CC8 for <bier@ietf.org>; Thu, 11 Nov 2021 08:55:45 -0800 (PST)
Received: from pps.filterd (m0108161.ppops.net [127.0.0.1]) by mx0b-00273201.pphosted.com (8.16.1.2/8.16.1.2) with ESMTP id 1AB8ndXk000426; Thu, 11 Nov 2021 08:55:03 -0800
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=juniper.net; h=from : to : subject : date : message-id : content-type : content-transfer-encoding : mime-version; s=PPS1017; bh=gwujKFJGVynP4LPisr6K99x4TsyvBZ0DOv09dkzcNbs=; b=MDRhiFdu2EGnUOztW8aXPnldwGWnNG+k/7N5nwt2Ki8vjtRLJGF3J2LsyzApyBHVz7d2 CkZLEP0G9lu13BpssFOjJxXWv7vh9BNDsgn5yKhX1V2l6kviGE9kzhJPvors2Ouh2u+u 0dGl1tSlIJ3SX3hsWjxgOWxc8W8vEadN+r21zSM9tENTmQaF1DlzMzsF7vNcLlRbtZAl VVsyf0BUSsMuQPoaHq3HxDqHms0nNkHYBJPx86zyi0wx7eNptdL4TO0iDe0E7Sf7+9rn nnKyfERk50O2dDQhjkRIxZ/AJamHEBV/PK/sYZIWnri6kaDgHL3yZt4SXsJKNf0NZYFC XA==
Received: from nam10-bn7-obe.outbound.protection.outlook.com (mail-bn7nam10lp2109.outbound.protection.outlook.com [104.47.70.109]) by mx0b-00273201.pphosted.com (PPS) with ESMTPS id 3c900d0tqg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 11 Nov 2021 08:55:03 -0800
ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=R0xRiSaii8S1Exz2O4td7yh2zc/Q4ELSKS8D5iQZ/P8+7JxNmHw0CUuviFgF/Q/dDGOMGrlLb4rr9KZfiaYwdGBLa642KiCj77Kju2imHIQO0BlEeo0sfX8RvcI+b716burxbLWqVR4RLaS4LxuZhpWGRrMGLPbp8bya/VZWLl2cCY6GlxBjkK8Hh4hQ/R7l3f8l9JlfagqZak1IJVUa0o2Cztkd9XDPl6EvmU8s4FJ9PkDSdNHVoLEdGorG04pWGB8ngwnweHjqTUIaRRrAKlWDLOnbjqQfRJWrPaE8JFccDklYIHRWfP0Udz6R8uHNCYBbTHxtHFRlVbvDzZkeMg==
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-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=gwujKFJGVynP4LPisr6K99x4TsyvBZ0DOv09dkzcNbs=; b=ViJpUkVHMovElgK8dioURJB0pWBAfNN2FKGP3Vv2fxhEo855lLUAAk/d0zi5a6++26wNpvpAI4uIVZ63viOaztl1uVStfy07k77nvSNJ27HpKJZ5Exi+jrCyEJmfJGBIb7rInQQwatHLDJA2nwKsZ7G4solf/O0fhgxjkR4lW+Se2BbAX0sxBX9l/sHf0jaV9h230UNY4h9cFw/WijklSzPSpN9GNamTE63OchpPhQuc2aNjJjl0/S9+4BfTgU76qdZ+Ao9Ymc4CKpCpRHVTwa51aRsfiXnJYGBjgiaEzjXF8r8p9NrJhkJM9V+JKEBFR2OYoaj/BCxFAJaVqhCuEw==
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=gwujKFJGVynP4LPisr6K99x4TsyvBZ0DOv09dkzcNbs=; b=Up/CYgAVgooCajcWwRKUuOrjlPLiWwup6qfwlunhDG8Mddsxyk1TBHFc7k2tuaYq9FgQQM/5j3D6rGUjhMZVOHAGhYYiB1HpxlALmmhQNkNBz+fY3auzk5MhxQmeAA9nnW4xa3gpvugm+PRWTTzpzR7M5JLSjAHwxJ4DmvEVgNk=
Received: from BYAPR05MB5654.namprd05.prod.outlook.com (2603:10b6:a03:18::17) by BYAPR05MB5895.namprd05.prod.outlook.com (2603:10b6:a03:cb::32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4690.5; Thu, 11 Nov 2021 16:54:59 +0000
Received: from BYAPR05MB5654.namprd05.prod.outlook.com ([fe80::c45e:9bd8:83c5:6af]) by BYAPR05MB5654.namprd05.prod.outlook.com ([fe80::c45e:9bd8:83c5:6af%6]) with mapi id 15.20.4690.017; Thu, 11 Nov 2021 16:54:59 +0000
From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "bier@ietf.org" <bier@ietf.org>, "lihn6@foxmail.com" <lihn6@foxmail.com>, "wangaj3@chinatelecom.cn" <wangaj3@chinatelecom.cn>
Thread-Topic: Comments on about PCEP and BIER
Thread-Index: AdfXFNNXhLS/9pEdR2mafc/wti4Paw==
Date: Thu, 11 Nov 2021 16:54:58 +0000
Message-ID: <BYAPR05MB5654E97967DA6219F82978B3D4949@BYAPR05MB5654.namprd05.prod.outlook.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
dlp-product: dlpe-windows
dlp-version: 11.6.300.5
dlp-reaction: no-action
msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ActionId=13cd0cfc-715f-4d63-98fb-1b4ee1e3e66d; 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=2021-11-11T15:56:46Z; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SiteId=bea78b3c-4cdb-4130-854a-1d193232e5f4;
x-ms-publictraffictype: Email
x-ms-office365-filtering-correlation-id: c7cdd8ad-55d2-4e21-cfaf-08d9a533ff4d
x-ms-traffictypediagnostic: BYAPR05MB5895:
x-microsoft-antispam-prvs: <BYAPR05MB58956579FBE56C5D8E0D5E3BD4949@BYAPR05MB5895.namprd05.prod.outlook.com>
x-ms-oob-tlc-oobclassifiers: OLM:10000;
x-ms-exchange-senderadcheck: 1
x-ms-exchange-antispam-relay: 0
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:BYAPR05MB5654.namprd05.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(366004)(52536014)(6506007)(966005)(9686003)(66946007)(110136005)(71200400001)(66476007)(508600001)(66556008)(64756008)(76116006)(55016002)(66446008)(33656002)(5660300002)(316002)(26005)(186003)(8936002)(38100700002)(122000001)(7696005)(38070700005)(2906002)(8676002)(86362001); DIR:OUT; SFP:1102;
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0: =?us-ascii?Q?OzjOBDYJah+b9veLwa+W0umIP8ttHmGyd9EK9nwnCynUzHOFAxPoQNc+/Lda?= =?us-ascii?Q?7ZnOaAwFSRzJVWOZULUcnuIHTvvfRJiYV7UHk3ZG3uRVyGHpPJtlqw3KFxBx?= =?us-ascii?Q?fReXfoge1zbi74RzwNuzn+kDqfEbgrzyi/Sv+EL7WlLToOqRJezvzrxt/kSz?= =?us-ascii?Q?oCeZCk2loHv9RlkGBK8ZEAfgK0j4XyYlWt1g5WD+rTZVRn93PqzzapO/u4fs?= =?us-ascii?Q?YqmCIQihwdRS+09L5nUWjPiU460ItTI+zaqWJxseZDcbHE1mHLBeQL+ikjs4?= =?us-ascii?Q?xKFB2NbwvHtCh/aLCqWWM/vKsquoG6S+BwfDUoD93SxaDxmfo7gAzS+CNqhu?= =?us-ascii?Q?K/HJmNxz5LDScSN4KzaG5Lg7DCmftsl/qcvLsW94oQeAKMSGteVpo3PX4Pjf?= =?us-ascii?Q?8VwCDZw0Ys/JiVsAQ69drnXXRqJA2W2Q+pIFE/dWQ6VHj7uCU60bvfzZ+n+j?= =?us-ascii?Q?JfwrlAHnne4yeWF4lWultqv/v2yK9IndrMGdkMpod7K7Hnnacqt+4R5AA/dz?= =?us-ascii?Q?jrHDv4tob/SIeHpNg/OMMm7Dk3pkOmSK7PzPQhJ9OMcQj505LNuikoDNCl0m?= =?us-ascii?Q?R1Ihvc4smmi2Mh3SJvAw0sezJegWOPukHg3mSoaS0dc4wzw5Bo/bmWENG/4V?= =?us-ascii?Q?+1CqbnWqd7YPFBXTWf9evvPr/vqpGmKAgv09YFCsfapHXGKw+MwCz5K5gld7?= =?us-ascii?Q?dt+paStM934tyyIqE43mMuH+LjjLGgXWmIE7KVPFm0TupX/7IS6qalTGBDZx?= =?us-ascii?Q?UwXFENhNjsF1xDZejveyrNd1FBXUX0gRir+ANKpP69tCutAGyMFbEx0kKOVl?= =?us-ascii?Q?xxYgZdzmRmkRXtka8pv2EfhJcXNIFtY96g+PrHN+UO9q8SI9y+RRwI/qU6xR?= =?us-ascii?Q?gEkmVcDfvtN8b7EgemOsfrgmjwZQN5CmxjDq4D1UKfEHKANJZYxjhs1REIg7?= =?us-ascii?Q?N2nyRkWSX92Zq2NBw7XHlUxe7U3tTfOTPPDJYwh9dYRZsGo0aPC3Llnz1KOI?= =?us-ascii?Q?+QEhBjifXtPFfWsaL1prgK7PLa2Fry1zN7OETdPebiRm9aBlCdykYeWniiBu?= =?us-ascii?Q?YDkZnlRh35rM5hk8ELedvO2/UgYSIC/Fbil/mB3irdKP+O3bwRYCACdy3yxI?= =?us-ascii?Q?agovsEtIkcBiYO4+07bHRjzyfpmczdR8I7vLWtNdtylsUF+7RyaFhSW2tbbz?= =?us-ascii?Q?z7cD91VIoGPcTBFjNm1T53S/KVF/aqmRknIdtiOh7cnZTW/BirL6aH0f2zO1?= =?us-ascii?Q?sEM/l9yzkwXwVJhZEw6RZS2HYC6mvqrUZFfavHuoP+/8FnI8QccVwQIJ0qfk?= =?us-ascii?Q?jaS8AzNwvUzdg7GHwN0RvEfpONJzHd2EGPYklIhVbQFURNqgWLkCdGK9060V?= =?us-ascii?Q?6xmfNy/N8dwJk8/nU8H20O/L7I3e1e9BiHMYr0FAevIoDhOWUk+35zUZqvsW?= =?us-ascii?Q?PKxJ+kIXTnaBraOSceiMIphT2xwhegSog0lW5hvsXnaIB/gqKJ7nG7Ea2xS6?= =?us-ascii?Q?mLEi9vhdm+9vF6AzsbcMc84DMtMpv9SQ2hK+4KHE//gYFvMhvhVfj1lFFCJk?= =?us-ascii?Q?mfXqlmYEDccvaM3doDGUAuZTAYtcZQjrWf/r24zXiUB6ggiuSmE46+Z3CR6h?= =?us-ascii?Q?aQ=3D=3D?=
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: BYAPR05MB5654.namprd05.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id: c7cdd8ad-55d2-4e21-cfaf-08d9a533ff4d
X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Nov 2021 16:54:59.2911 (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: VmAIjacIv6wFnxg2Eh/vZlWcRCXrPGQYob0NXbVQKB4/q7OQcc04EGNDvkW2QjbMLybnNqQEF7hKwzu6+WyBYw==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR05MB5895
X-Proofpoint-ORIG-GUID: Hurss1iEEuRcX1F8gDUK50yvO7brD4LD
X-Proofpoint-GUID: Hurss1iEEuRcX1F8gDUK50yvO7brD4LD
X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475 definitions=2021-11-11_06,2021-11-11_01,2020-04-07_01
X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 clxscore=1011 adultscore=0 spamscore=0 bulkscore=0 mlxlogscore=912 mlxscore=0 lowpriorityscore=0 priorityscore=1501 suspectscore=0 phishscore=0 malwarescore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2111110091
Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/qq3tBjoJU9gCPvmmBkGiPe3hkDQ>
Subject: [Bier] Comments on about PCEP and BIER
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: Thu, 11 Nov 2021 16:55:50 -0000

Hi,

These are follow up comments about draft-li-pce-based-bier presented in today's BIER session.

Tony mentioned it's better to rename it to something like "bier-pcep-overlay-ip-mcast". There was also a question whether there should be one PCEP document for other multicast trees.

I think there should be one PCEP document (or a set of PCEP documents with *similar* signaling/procedures) that covers all the following:

- Set up multicast trees in default/master routing instance or VRFs, whether it is IP multicast or SR-P2MP tunnel or even mLDP tunnel
- The replication can be BIER or BIER-TE or native IP forwarding (just like in PIM case) or MPLS/SRv6 based

In fact, there is one similar document for BGP signaling already - draft-ietf-bess-bgp-multicast-controller - that does all the above using BGP (see https://mailarchive.ietf.org/arch/msg/idr/V_GLdnLnIA87wsd3fbcUKchNnTs/ about how BIER-TE can be used for replication on a multicast tree node). I am not saying that PCEP is not needed - I am just saying that similar specification can be done for PCEP.

If we take that approach, the document would be homed in PCEP, and BIER/BIER-TE relevant part is just how to specify the bitstring that a BFIR would use (i.e., 7.3.  Forwarding Indication Object) - assuming that "7.1.2.  BIER Information TLV" would be done via BGP-LS.

Thanks.

Jeffrey



Juniper Business Use Only