Re: [Lsr] Prefix Unreachable Announcement Use Cases

"Acee Lindem (acee)" <acee@cisco.com> Mon, 16 November 2020 08:45 UTC

Return-Path: <acee@cisco.com>
X-Original-To: lsr@ietfa.amsl.com
Delivered-To: lsr@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 18CD73A15C7 for <lsr@ietfa.amsl.com>; Mon, 16 Nov 2020 00:45:45 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -9.6
X-Spam-Level:
X-Spam-Status: No, score=-9.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com header.b=C+eLRna6; dkim=pass (1024-bit key) header.d=cisco.onmicrosoft.com header.b=dzsm5rN0
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 8rPcFGzVnoRV for <lsr@ietfa.amsl.com>; Mon, 16 Nov 2020 00:45:43 -0800 (PST)
Received: from alln-iport-8.cisco.com (alln-iport-8.cisco.com [173.37.142.95]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 389E53A0D21 for <lsr@ietf.org>; Mon, 16 Nov 2020 00:45:43 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=8745; q=dns/txt; s=iport; t=1605516343; x=1606725943; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=heiORER6cyQnAYdvgH9bnkKNqmoQ79sjmBFTdX04HJY=; b=C+eLRna6uSr2MRSrk0U9+z9d86RNDp2acqkyK1PnIkkFvJIqoujShC1M 1QjOngZxlhfNBQh5twufFRnlWcsW0ZHDzbD8Jy4MUzALL3HndeZ+6Gb7t lOtAM0cKpN9N827QCdh8NEK5XRubLDBmVYePIPPM3GihZDZklboq5bavE Q=;
X-IPAS-Result: =?us-ascii?q?A0BgBwDvObJffYYNJK1iHQEBAQEJARIBBQUBgg+BIy9Re?= =?us-ascii?q?1kvLgqEMoNJA41WihaJfoRvglMDVAsBAQENAQEtAgQBAYRKAheCBwIlOBMCA?= =?us-ascii?q?wEBAQMCAwEBAQEFAQEBAgEGBBQBAYY8DIVyAQEBAQMSER0BATcBDwIBCBEDA?= =?us-ascii?q?QIrAgICHxEdCAIEAQ0FIoMEAYF+VwMuAaE3AoE8iGh2gTKDBAEBBYJMgjUNC?= =?us-ascii?q?4IQCYE4gnODdoJEhBMbggCBESccgiEuPoIbgkOCdzOCLJA3PII3PocegymZL?= =?us-ascii?q?1QKgm2WAoUTAx+heY5qhGiNa5JoAgQCBAUCDgEBBYFrIYFZcBVlAYI+UBcCD?= =?us-ascii?q?Y4fg3GKWHQ3AgYBCQEBAwl8jDsBgRABAQ?=
IronPort-PHdr: =?us-ascii?q?9a23=3A+/KV0BBcqhf0XW3rlurPUyQJPHJ1sqjoPgMT9p?= =?us-ascii?q?ssgq5PdaLm5Zn5IUjD/qw00g3TVJ7J9vECjefK4OjsWm0FtJCGtn1KMJlBTA?= =?us-ascii?q?QMhshemQs8SNWEBkv2IL+PDWQ6Ec1OWUUj8yS9Nk5YS9z3fE/PoTu04CJBUh?= =?us-ascii?q?n6PBB+c+LyHIOahs+r1ue0rpvUZQgAhDe0bb5oahusqgCEvcgNiowkIaE0mR?= =?us-ascii?q?Y=3D?=
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-AV: E=Sophos;i="5.77,482,1596499200"; d="scan'208,217";a="609586994"
Received: from alln-core-12.cisco.com ([173.36.13.134]) by alln-iport-8.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 16 Nov 2020 08:45:42 +0000
Received: from XCH-RCD-003.cisco.com (xch-rcd-003.cisco.com [173.37.102.13]) by alln-core-12.cisco.com (8.15.2/8.15.2) with ESMTPS id 0AG8jfDH023683 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=FAIL); Mon, 16 Nov 2020 08:45:42 GMT
Received: from xhs-rtp-001.cisco.com (64.101.210.228) by XCH-RCD-003.cisco.com (173.37.102.13) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 16 Nov 2020 02:45:30 -0600
Received: from xhs-rcd-003.cisco.com (173.37.227.248) by xhs-rtp-001.cisco.com (64.101.210.228) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 16 Nov 2020 03:45:30 -0500
Received: from NAM02-BL2-obe.outbound.protection.outlook.com (72.163.14.9) by xhs-rcd-003.cisco.com (173.37.227.248) with Microsoft SMTP Server (TLS) id 15.0.1497.2 via Frontend Transport; Mon, 16 Nov 2020 02:45:29 -0600
ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=ID0cfzeg4UNh4UtuGaA2pRk4QtzRkjsjcUS9CX82OqyHMCKk6cr7xuDW44nrqJeM9NTXFYGyhDy0lEifwpBQaPR0EKN4qDuPfjObseLrbZsru/1qvQSDLkTDJAmkDxTtAz1BN2PabwcdGeAz8ilZi81d8wJeAum4SVCzR5kI+agxzzUlGbmDQoO7N64xA8a7tAZeWZjzo9Mfx5wnEBbB9lWtttHCbL7LmkFvHaJIUMsS0LRcAlWDMz1KtnyXnQFmnAEUH6FFsZMr1HXQijFLWGbye/AepQzjn7gzO1YcR6Dm/0NGMiV3T1KuEJbi8x92wszRjGbeKGw+2Sc+Wl7P/A==
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=heiORER6cyQnAYdvgH9bnkKNqmoQ79sjmBFTdX04HJY=; b=VHJ9G0Q6tr7PWp4nU6HI70jJo4Zo3G9kwb1ZrgzboU7si8elBJ7IK78WrPslT09ldDVgrhS09wWpWXd9xbSc+yOkWM5SlffM2kuxkpaHaiI1wYIfzfnbg9C/98V4gPvsNAuG4Vpc4kPnaTm6o5+Na20amJoaklvQyOVP7izk8heszNmNWB9E/SkYY9FLp9fvNAeOW4xl9pY7imG3/8UaXuoLQWy/0NqoJiyvHDvngrtwx8NOGs9WokAOiy4eqABDDNcBfSIXc3/ewJSWaXTJdyH1JjxaTn820+Q0zSFFLnXfDBAhZ3Z64lA/MHtGRMnDpsRCfQRJJdDilHGsfUFlww==
ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=cisco.com; dmarc=pass action=none header.from=cisco.com; dkim=pass header.d=cisco.com; arc=none
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cisco.onmicrosoft.com; s=selector2-cisco-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=heiORER6cyQnAYdvgH9bnkKNqmoQ79sjmBFTdX04HJY=; b=dzsm5rN0uHeF708HAB93LnTnzZJNG7+O1DTTmAnFOZx2Xno+rFNRHhV9+2cAbSwt7qB4tJl8pvZbQA9Wq3qa+DHQnDc8gLSSqmBcHg8VuPRnDb+n0LzNXk6TvbV4eOnnxQDLHqpnExG/cNyUIjiQ9KdQj1Ew9Qn6vvqgu+2V8PM=
Received: from BYAPR11MB2887.namprd11.prod.outlook.com (2603:10b6:a03:89::27) by SJ0PR11MB5118.namprd11.prod.outlook.com (2603:10b6:a03:2dd::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3541.24; Mon, 16 Nov 2020 08:45:26 +0000
Received: from BYAPR11MB2887.namprd11.prod.outlook.com ([fe80::1ddc:cdb4:32cc:f078]) by BYAPR11MB2887.namprd11.prod.outlook.com ([fe80::1ddc:cdb4:32cc:f078%3]) with mapi id 15.20.3564.028; Mon, 16 Nov 2020 08:45:26 +0000
From: "Acee Lindem (acee)" <acee@cisco.com>
To: Robert Raszuk <robert@raszuk.net>, Aijun Wang <wangaijun@tsinghua.org.cn>
CC: Jeff Tantsura <jefftant.ietf@gmail.com>, lsr <lsr@ietf.org>
Thread-Topic: [Lsr] Prefix Unreachable Announcement Use Cases
Thread-Index: AQHWu1Gr6nBEatikRUm9MC1o5feYm6nJZmuAgAAuKgCAAAmVAIAAdmCAgABY4gD//7HGgA==
Date: Mon, 16 Nov 2020 08:45:26 +0000
Message-ID: <ACA61115-35A0-46A5-A88D-38ED85BF80B3@cisco.com>
References: <CAOj+MMEREV+TCwNiptdVj--HjD5nJV8zOiUJ5THcsomWCa1jJA@mail.gmail.com> <B0A6A569-30F7-4751-9F3B-C65BD23D39F3@gmail.com> <CAOj+MMEYnHeuNnNy-yDuxywMLe+yHv3QfXYqtqEgom7RbTO6Sg@mail.gmail.com> <020d01d6bbc5$9769e7e0$c63db7a0$@tsinghua.org.cn> <CAOj+MMH7zRaXNJTRC0ua7ohasUpo0MmeqgzcU9BdpcD7wD+Yrg@mail.gmail.com>
In-Reply-To: <CAOj+MMH7zRaXNJTRC0ua7ohasUpo0MmeqgzcU9BdpcD7wD+Yrg@mail.gmail.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
user-agent: Microsoft-MacOutlook/16.42.20101102
authentication-results: raszuk.net; dkim=none (message not signed) header.d=none;raszuk.net; dmarc=none action=none header.from=cisco.com;
x-originating-ip: [136.56.133.70]
x-ms-publictraffictype: Email
x-ms-office365-filtering-correlation-id: c2df5983-50cb-4ccc-bd45-08d88a0bf701
x-ms-traffictypediagnostic: SJ0PR11MB5118:
x-microsoft-antispam-prvs: <SJ0PR11MB5118CC7733EC4B90D44D7536C2E30@SJ0PR11MB5118.namprd11.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: pqZKZ4F1FhcenbEk+q1oebW9kd7J76zsyW+OxfMr1uV3qsitamxhgIfrW/wp6akSonep2RfvGz1GhUcvJAkalB/giMAkPQCutjRRnT+wyjBTTiENiFODV/1N0zgrKB6LqcAbAQAlYtDgknnO1qiPybI1R1jc+n9oDaYdKvwPPNGQvnnU6/mv6ZfwIBqs5ejX7NNQHPO/uQeEAQpn5jhq0n0aHLjWqZ3loBbgSaQws4RZpMW/cCXCU/35xXwmwlqtTWSfhu/mpNqxbNkXEwrPolKcyVikuKBPeBPXlt+lA1HKaiE5LbK0KD1KdExlfWtx
x-forefront-antispam-report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:BYAPR11MB2887.namprd11.prod.outlook.com; PTR:; CAT:NONE; SFS:(346002)(366004)(136003)(376002)(39860400002)(396003)(66446008)(4326008)(8676002)(8936002)(2906002)(86362001)(33656002)(66946007)(76116006)(66556008)(91956017)(64756008)(66476007)(110136005)(36756003)(66574015)(71200400001)(83380400001)(5660300002)(6512007)(54906003)(6486002)(2616005)(6506007)(53546011)(186003)(26005)(316002)(478600001); DIR:OUT; SFP:1101;
x-ms-exchange-antispam-messagedata: SOD6mKtzzGK9OJyFxOqtFchcze/jiE9n7WSc7HCxbaYlJ0r6GHL8KGI7HXkTIcUWKN/dohmpJQwm0bLQ55C8uVGp9GoW99BC3pPHhI5kNOpu3Md/9kmuNgv/94ZAMVv+ifgSHUcjGq4o2ObOZlf/nf7oUfF2rsMFx+VOg2G4F7ZzWHQiSLdo8uUQ4afqpaj27NKBEjf6oWSIj4BaCvXaT57BfSX2peYHr9hu9dDxr7HnIiXISxzA+PsOvHBA4vfOeUnFK555DYWCCuJlGDyYlK3sF0kxxO4lEnNT8fyWmyINx/YWOtE0TFW8NRs6GqmR4VcJSMtBgP+uqe9o6vFrpDXuyOL024lBvH1uTiNtJmVDTglS9AS3/pBSmFGKQ3Cu8wR+7DQ//T6yVXi/EXSPXIAFQKTIwHQ48/yzAJalTRSa1eOyEqdM7PY4m5H51wK4TcJ4kqXEAOLgPWzjufcVKg1uylXaHxXdvHss6qLtekNCehfgJLvB3OwMdA86Ynk6iWV8kFKNBPTGgdQenC4kZd2xkMnXfP2lG3xAs7AoIwgblAAGWA2XtYaAHWb6xOVvanCESfrF4CFiPQ6X7LCZGU4v8KKURQIIVfTc3Hh8XXstrttHLN0yyOzJ+mNv7pD87gbcHUA0vDSaESfKMqbDgw==
x-ms-exchange-transport-forked: True
Content-Type: multipart/alternative; boundary="_000_ACA6111535A046A5A88D38ED85BF80B3ciscocom_"
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: BYAPR11MB2887.namprd11.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id: c2df5983-50cb-4ccc-bd45-08d88a0bf701
X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Nov 2020 08:45:26.5165 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: rFq2DHO3xFaLg22ptqPhGDnbTHJQDbGTDsmhf0+n8jJRmZa0t6HEekjWNDOsS2UK
X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR11MB5118
X-OriginatorOrg: cisco.com
X-Outbound-SMTP-Client: 173.37.102.13, xch-rcd-003.cisco.com
X-Outbound-Node: alln-core-12.cisco.com
Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/5451WrkJ8oBlq8QNcAy8Af0D7NQ>
Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases
X-BeenThere: lsr@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Link State Routing Working Group <lsr.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/lsr>, <mailto:lsr-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/lsr/>
List-Post: <mailto:lsr@ietf.org>
List-Help: <mailto:lsr-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/lsr>, <mailto:lsr-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 16 Nov 2020 08:45:45 -0000

When the PUA use cases were presented today in the LSR meeting, I made the comment that the RIB interactions for each use case would be different and needed to be specified.
Thanks,
Acee


From: Robert Raszuk <robert@raszuk.net>
Date: Monday, November 16, 2020 at 3:25 AM
To: Aijun Wang <wangaijun@tsinghua.org.cn>
Cc: Jeff Tantsura <jefftant.ietf@gmail.com>om>, lsr <lsr@ietf.org>rg>, Acee Lindem <acee@cisco.com>
Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases

I was not bringing RIFT's negative routies example as something inherently negative. I was just pointing it out to illustrate that today's data plane lookup does not really support "if does not match" checks.
[WAJ] In data plane, the device do still the “match” check, not “does not match” check.  When the router receives the PUA information, it will install one black hole route for a short time.

So your idea is that you install route for unreachable prefix to /dev/null ?

And how would that help connectivity restoration ?

Moreover it seems that it will just also prevent any local protection to locally bypass the failed destination.

Bottom line is that I agree with one problem statement. However IMHO described actions upon reception of PUA are questionable at best.

Cheers,
R.