Re: [OSPF] [OSPF-SR] Regarding graceful restart behavior with change in SR informaiotn carrying LSA

"Acee Lindem (acee)" <acee@cisco.com> Mon, 29 May 2017 19:44 UTC

Return-Path: <acee@cisco.com>
X-Original-To: ospf@ietfa.amsl.com
Delivered-To: ospf@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 99615126CD8; Mon, 29 May 2017 12:44:53 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -14.522
X-Spam-Level:
X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-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
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 73CqSMyztrbI; Mon, 29 May 2017 12:44:51 -0700 (PDT)
Received: from rcdn-iport-6.cisco.com (rcdn-iport-6.cisco.com [173.37.86.77]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9C02C127333; Mon, 29 May 2017 12:44:51 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=9509; q=dns/txt; s=iport; t=1496087091; x=1497296691; h=from:to:cc:subject:date:message-id:mime-version; bh=n2VzlhFpVdEle2JIOpUx7vkuDod2BHdI00ETor8B3PA=; b=NpVA3vKtEoPtdTFxAW5sSYjHgmrDbRMcJcwwYFn/vja48yaFq2ZaWawn heL5jOqbbDL8zflnECAdDx11++QK45Zj7csGDZ1Pz8qHse0uLEqrJHuXD x1UjHL66Y5IEUzbrbrcXEKlDVXGL/t3B2MgpMsLIUbYWTJ+rM5ryxtut1 c=;
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0D+AADUeSxZ/4kNJK1dGQEBAQEBAQEBA?= =?us-ascii?q?QEBBwEBAQEBgm5nYoENB4NrihiRZpBBhTiCD4YkHII/PxgBAgEBAQEBAQFrKIU?= =?us-ascii?q?YAQMDIwo6EhIBCBEDAQIkBAMCBDAUCQoEAQ0FiUZkq26CJotFAQEBAQEBAQEBA?= =?us-ascii?q?QEBAQEBAQEBAQEBHYhAgyCFCQaCbIJgBZ4jAZMnkXeUTQEfOIEKdBVGhTiBSna?= =?us-ascii?q?IbIENAQEB?=
X-IronPort-AV: E=Sophos;i="5.38,415,1491264000"; d="scan'208,217";a="251201195"
Received: from alln-core-4.cisco.com ([173.36.13.137]) by rcdn-iport-6.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 29 May 2017 19:44:47 +0000
Received: from XCH-RTP-015.cisco.com (xch-rtp-015.cisco.com [64.101.220.155]) by alln-core-4.cisco.com (8.14.5/8.14.5) with ESMTP id v4TJilCV009682 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Mon, 29 May 2017 19:44:47 GMT
Received: from xch-rtp-015.cisco.com (64.101.220.155) by XCH-RTP-015.cisco.com (64.101.220.155) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 29 May 2017 15:44:46 -0400
Received: from xch-rtp-015.cisco.com ([64.101.220.155]) by XCH-RTP-015.cisco.com ([64.101.220.155]) with mapi id 15.00.1210.000; Mon, 29 May 2017 15:44:46 -0400
From: "Acee Lindem (acee)" <acee@cisco.com>
To: Veerendranatha Reddy Vallem <veerendranatharv@huawei.com>, "draft-ietf-ospf-segment-routing-extensions@ietf.org" <draft-ietf-ospf-segment-routing-extensions@ietf.org>
CC: OSPF WG List <ospf@ietf.org>
Thread-Topic: [OSPF] [OSPF-SR] Regarding graceful restart behavior with change in SR informaiotn carrying LSA
Thread-Index: AQHS2LQGn4zkBsbfPUqaamx8ipl8RA==
Date: Mon, 29 May 2017 19:44:46 +0000
Message-ID: <D551EFD9.B18F5%acee@cisco.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-ms-exchange-messagesentrepresentingtype: 1
x-ms-exchange-transport-fromentityheader: Hosted
x-originating-ip: [10.116.152.196]
Content-Type: multipart/alternative; boundary="_000_D551EFD9B18F5aceeciscocom_"
MIME-Version: 1.0
Archived-At: <https://mailarchive.ietf.org/arch/msg/ospf/0sl7fEXbpSCH9N5uxjrazYBfmpY>
Subject: Re: [OSPF] [OSPF-SR] Regarding graceful restart behavior with change in SR informaiotn carrying LSA
X-BeenThere: ospf@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: The Official IETF OSPG WG Mailing List <ospf.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ospf>, <mailto:ospf-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/ospf/>
List-Post: <mailto:ospf@ietf.org>
List-Help: <mailto:ospf-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ospf>, <mailto:ospf-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 29 May 2017 19:44:53 -0000

Hi Veeru,

I think that changes to Prefix/Link Attribute LSAs must be considered as a topology change for purposes of  RestartHelperStrictLSAChecking. If this were to be covered, it should have been in RFC 7684. Although RFC 3623 doesn’t really specify what constitutes a topology change.

However, perhaps we could add a note in this draft.

Thanks,
Acee

From: OSPF <ospf-bounces@ietf.org<mailto:ospf-bounces@ietf.org>> on behalf of Veerendranatha Reddy Vallem <veerendranatharv@huawei.com<mailto:veerendranatharv@huawei.com>>
Date: Monday, May 29, 2017 at 5:41 AM
To: "draft-ietf-ospf-segment-routing-extensions@ietf.org<mailto:draft-ietf-ospf-segment-routing-extensions@ietf.org>" <draft-ietf-ospf-segment-routing-extensions@ietf.org<mailto:draft-ietf-ospf-segment-routing-extensions@ietf.org>>
Cc: OSPF WG List <ospf@ietf.org<mailto:ospf@ietf.org>>
Subject: [OSPF] [OSPF-SR] Regarding graceful restart behavior with change in SR informaiotn carrying LSAs

Dear Authors,

In OSPFv2:
I am requesting for your clarification regarding  change in Opaque Type 7 and Opaque Type 8 LSAs (LSA origination/flush or modify)  need to consider for OSPFv2 GR exit case or not.
As per my understanding these LSAs will not be topology LSAs for OSPF, so it may not require to consider these LSAs for GR case.
I am requesting for your confirmation.

Also in OSPFv3:
SR information is carried in new extension LSAs, which can carry both topology and attribute information.
In this case, whether we need to consider LSA change for Graceful restart or not.
I am requesting for your confirmation.

Regards,
Veerendranath