IETF Logo Mail Archive

Re: [Lsr] Regarding OSPF Extended Prefix Range TLV usage for External/NSSA prefixes defined in RFC 8665

Peter Psenak <ppsenak@cisco.com> Tue, 18 August 2020 17:35 UTC

Return-Path: <ppsenak@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 537E13A0885 for <lsr@ietfa.amsl.com>; Tue, 18 Aug 2020 10:35:56 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -10.55
X-Spam-Level:
X-Spam-Status: No, score=-10.55 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.949, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=unavailable 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 WEF2RJLrNNie for <lsr@ietfa.amsl.com>; Tue, 18 Aug 2020 10:35:55 -0700 (PDT)
Received: from aer-iport-4.cisco.com (aer-iport-4.cisco.com [173.38.203.54]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C96213A088A for <lsr@ietf.org>; Tue, 18 Aug 2020 10:35:54 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=973; q=dns/txt; s=iport; t=1597772155; x=1598981755; h=subject:to:references:from:message-id:date:mime-version: in-reply-to:content-transfer-encoding; bh=2xmDpeA1HTIiRKYA3MA8cWRHn4JDsk1qT9ZiYI9yshA=; b=j6K/UxjZBRGp61gwIjYEgiqK8pG9eNfTgUODQMi7XnohO2XPS3vnP4CP +vXEfijRsygbnw2i4ISn96SIB2p1eWkOcqN4RwvUFoS87NJ8T1GhjV9r7 3xeOgqPsrFlr+/MST1i7xJy9F+vLdhOee3KwRQcp478CrUyeKOQHU+Q9C c=;
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: A0C1AADqEDxf/xbLJq1fHAEBAQEBAQcBARIBAQQEAQFAgTkEAQELAYNtASAShGOJAYgknBQLAQEBDi8EAQGETAKCICU3Bg4CAwEBCwEBBQEBAQIBBgRthWiFcQEBAQMBIw8BBVELGAICHwcCAlcGAQwIAQGDIoJdILBqdoEyhVKDZIFAgQ4qAY05gUE/gREngjsuPoEEhlCCYAS2L4JsgwyXCQUHAx6RZo49kjufaIFpJIFXMxoIGxWDJU8ZDY43H44SPwNnAgYBCQEBAwmQbAEB
X-IronPort-AV: E=Sophos;i="5.76,328,1592870400"; d="scan'208";a="28792796"
Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 18 Aug 2020 17:35:50 +0000
Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 07IHZo0C023468; Tue, 18 Aug 2020 17:35:50 GMT
To: Veerendranatha Reddy V <veerendranatha.reddy.v=40ericsson.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
References: <DB7PR07MB3914AA1BF15E141673DF1E11BB5C0@DB7PR07MB3914.eurprd07.prod.outlook.com>
From: Peter Psenak <ppsenak@cisco.com>
Message-ID: <bb8d3f97-ec52-a91d-c3d6-896f86f498c1@cisco.com>
Date: Tue, 18 Aug 2020 19:35:49 +0200
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0
MIME-Version: 1.0
In-Reply-To: <DB7PR07MB3914AA1BF15E141673DF1E11BB5C0@DB7PR07MB3914.eurprd07.prod.outlook.com>
Content-Type: text/plain; charset="utf-8"; format="flowed"
Content-Language: en-US
Content-Transfer-Encoding: 8bit
X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com
X-Outbound-Node: aer-core-4.cisco.com
Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/7zId4M1rS6RlzNmutypT2HyXrPQ>
Subject: Re: [Lsr] Regarding OSPF Extended Prefix Range TLV usage for External/NSSA prefixes defined in RFC 8665
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: Tue, 18 Aug 2020 17:35:56 -0000

Veerendranath,

On 18/08/2020 16:40, Veerendranatha Reddy V wrote:
> Hi Authors, All,
> 
> OSPF Extended Prefix Range TLV defined in RFC 8665 has IA flag to 
> distinguish between Intra and Inter Area scope prefixes.
> 
> Whether any restrictions to not to use Prefix Range TLV for 
> external/NSSA prefixes ?

I don't see how you can use OSPF Extended Prefix Range TLV for NSSA, the 
usage of OSPF Extended Prefix Range TLV has only been defined in the 
context of RFC 8665.

thanks,
Peter


> 
> For External Prefixes, we can able to use  Prefix Range TLV  by using 
> LSA type (based on AS scope Opaque Type , so the TLV is for External 
> Prefixes)
> 
> But If we need to use the Prefix Range TLV for NSSA prefixes (Type-7) , 
> which are in area scope, there is no flag/route-type field in this TLV 
> to distinguish between Intra or NSSA prefixes( as IA flag will not be 
> set anyway).
> 
> Thanks & Regards,
> 
> Veerendranath
>

v2.23.0 | Report a Bug | By Email