Subject: RE: [ipfix] [issue] INFO-17 Variant Field Types

From: "MEYER,JEFFREY D (HP-Cupertino,ex1)" <[email-masked]>
Date: Mon, 24 Nov 2003 14:40:27 -0500

Yes, that's what I was trying to say.

The introduction to the Type Space (section 4) in -02 alludes to this:

http://www.ipdr.org/documents/ipfix/infomodel/draft-ietf-ipfix-info-02.html#
anchor4

...
Please note that a protocol implementation may based on local configuration,
chose to carry integer values in network byte order encodings in a byte size
which differs (greater or smaller) than the size implied by the information
elements type. 

For instance although byteCount is defined as an unsignedLong, which would
require 8 bytes for each reported value. An implementation may send only a 4
byte quantity, if it knows that it will not exceed this amount for an
individual flow 
...

-- Jeff

-----Original Message-----
From: Stewart Bryant [mailto:[email-masked]]
Sent: Monday, November 24, 2003 2:30 AM
To: MEYER,JEFFREY D (HP-Cupertino,ex1)
Cc: 'Ipfix Wg' (E-mail)
Subject: Re: [ipfix] [issue] INFO-17 Variant Field Types

MEYER,JEFFREY D (HP-Cupertino,ex1) wrote:

> Issue:  INFO-17  Variant Field Types
> Description:
>   - allow in encoding, make explicit in information model.
>     Motivation is if known integer quantities for a given exporter
>     are in a smaller range, fewer bytes can be used to send across
>     the wire.
>    
>     A consumer should be made aware of the largest size any compliant
>     should export - (information model)
>   Original text:
>   http://ipfix.doit.wisc.edu/archive/1935.html

I take this to mean that the info model will specify the maximum size,
but the protocol description will include a description of reduces
size encoding.

Is that correct?

Stewart

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