Re: [IPFIX] IPFIX export: SNMP versus physical Interface

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Tue, 26 July 2011 15:02 UTC

Return-Path: <j.schoenwaelder@jacobs-university.de>
X-Original-To: ipfix@ietfa.amsl.com
Delivered-To: ipfix@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0F0ED11E80A3 for <ipfix@ietfa.amsl.com>; Tue, 26 Jul 2011 08:02:24 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -102.964
X-Spam-Level:
X-Spam-Status: No, score=-102.964 tagged_above=-999 required=5 tests=[AWL=0.285, BAYES_00=-2.599, HELO_EQ_DE=0.35, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100]
Received: from mail.ietf.org ([64.170.98.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id W+EwvEK7xqWs for <ipfix@ietfa.amsl.com>; Tue, 26 Jul 2011 08:02:23 -0700 (PDT)
Received: from hermes.jacobs-university.de (hermes.jacobs-university.de [212.201.44.23]) by ietfa.amsl.com (Postfix) with ESMTP id 14DFB1F0C36 for <ipfix@ietf.org>; Tue, 26 Jul 2011 08:02:23 -0700 (PDT)
Received: from localhost (demetrius3.jacobs-university.de [212.201.44.48]) by hermes.jacobs-university.de (Postfix) with ESMTP id 6ED2E20BFE; Tue, 26 Jul 2011 17:02:22 +0200 (CEST)
X-Virus-Scanned: amavisd-new at jacobs-university.de
Received: from hermes.jacobs-university.de ([212.201.44.23]) by localhost (demetrius3.jacobs-university.de [212.201.44.32]) (amavisd-new, port 10024) with ESMTP id nx6cLsdhlxbG; Tue, 26 Jul 2011 17:02:21 +0200 (CEST)
Received: from elstar.local (elstar.jacobs.jacobs-university.de [10.50.231.133]) by hermes.jacobs-university.de (Postfix) with ESMTP id 15B7B20BF8; Tue, 26 Jul 2011 17:02:21 +0200 (CEST)
Received: by elstar.local (Postfix, from userid 501) id 57F1B1A18E15; Tue, 26 Jul 2011 17:02:20 +0200 (CEST)
Date: Tue, 26 Jul 2011 17:02:20 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Andrew Feren <andrewf@plixer.com>
Message-ID: <20110726150219.GA7287@elstar.local>
Mail-Followup-To: Andrew Feren <andrewf@plixer.com>, ipfix@ietf.org
References: <4E2EB359.8070309@cisco.com> <20110726131514.GA6421@elstar.local> <4E2EBFEA.7080109@cisco.com> <4E2ED53C.6070803@plixer.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <4E2ED53C.6070803@plixer.com>
User-Agent: Mutt/1.5.21 (2010-09-15)
Cc: ipfix@ietf.org
Subject: Re: [IPFIX] IPFIX export: SNMP versus physical Interface
X-BeenThere: ipfix@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
Reply-To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
List-Id: IPFIX WG discussion list <ipfix.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ipfix>, <mailto:ipfix-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/ipfix>
List-Post: <mailto:ipfix@ietf.org>
List-Help: <mailto:ipfix-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ipfix>, <mailto:ipfix-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 26 Jul 2011 15:02:24 -0000

On Tue, Jul 26, 2011 at 10:54:52AM -0400, Andrew Feren wrote:

> From a collection and reporting perspective the important difference for
> me in these two sets of definitions isn't physical vs maybe not
> physical, but that "The value matches the value of managed object
> 'ifIndex' as defined in RFC 2863 ..." and everything that implies for
> elements 10/14.
> 
> So I agree with Paul's approach.  There are situations where either
> 10/14 or 252/253 could be used, but if RFC 2863 applies to your
> interface use 10/14.
> 
> Maybe rather than replacing "IP interface" with "logical or virtual
> interface" it could just be "interface" or "network interface".
> 
> On a related not I'm not sure the references for 252/253 need to refer
> readers to "[RFC2863] for the definition of the ifIndex object."

RFC2863 always applies to an ifIndex object. I fail to see the
problem. I find the definitions of these elements rather clear as they
are written.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1, 28759 Bremen, Germany
Fax:   +49 421 200 3103         <http://www.jacobs-university.de/>