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

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Tue, 26 July 2011 13:15 UTC

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Date: Tue, 26 Jul 2011 15:15:14 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Paul Aitken <paitken@cisco.com>
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Cc: IETF IPFIX Working Group <ipfix@ietf.org>
Subject: Re: [IPFIX] IPFIX export: SNMP versus physical Interface
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On Tue, Jul 26, 2011 at 01:30:17PM +0100, Paul Aitken wrote:
> Dear IPFIXers,
> 
> I noticed that the definitions of fields 10 and 14, and fields 252
> and 253 are confusingly similar. See below.
> 
> Cisco uses fields 10 and 14 to export the logical or virtual
> interface (eg. SVI, tunnel), while fields 252 and 253 export the
> actual physical interface.
> 
> For example, if we have an SVI configured on a VLAN, the SNMP index
> of the SVI would be exported using fields 10 and 14, while the SNMP
> index of the physical port in that VLAN would be exported with
> fields 252 and 253.
> 
> So I propose to update fields 10 and 11 to say, "the index of the
> logical or virtual interface ...", to contrast with 252 and 253
> which say, "The index of a networking device's physical interface
> ...".

Not sure this is right because if I only have a physical interface and
no logical/virtual interfaces, I think I still want to report the
physical interface in fields 10 and 11, no? I am not sure why there is
actually a need to change something here.

/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/>