Subject: Re: new version of QPIM

From: "John Strassner" <[email-masked]>
Date: Sat, 2 Dec 2000 02:08:13 -0800

Hi Jean, I believe your issue is that if you want to build a
condition to filter traffic, the IETF IPsec model uses
classes derived from FilterEntryBase whereas QPIM uses two
different classes - gpsPolicySimpleCondition and
gpsPolicyCompoundCondition.

The reason for this is that the QPIM extends the definition
of a condition into an ordered triplet (i.e., {variable,
operator, value}). These semantics are not present in the
current definition of FilterEntryBase or its subclasses.
Furthermore, the QPIM further extends these semantics to
define a set of classes to model a set of common variables,
a corresponding set of classes to model the values that the
variables can take, and relationships to:

  1) constrain the values that a given variable can take
  2) relate the variables and values to a condition
  3) represent reusable variables and values

Note that an implementation could in fact produce a
FilterEntry from these classes.

HTH and kind regards,
John

----- Original Message -----
From: "Jean Christophe Martin (From Home)"
<[email-masked]>
To: "Yoram Ramberg" <[email-masked]>; <[email-masked]>
Cc: <[email-masked]>
Sent: Wednesday, November 29, 2000 9:51 AM
Subject: Re: new version of QPIM

> Yoram , John
>
> > A new (-02) version of the QoS Policy Information Model
draft has been sent
> > to the IETF for posting.
>
> Here is the motivation of my first mail to the alias :
>
> The CIM Network sub-model defines the elements :
FilterList,
> FilterEntryBase
> and FilterEntry.
> These Filters are describing the traffic in the Forwarding
Path.
>
> The IPSEC policy Model (IETF/DMTF)  is using these classes
as the basis
> for
> the condition part of the policy.
>
> However, your draft is redefining a condition object that
is not at all
> aligned with the IETF (IPSEC) or the DMTF (QoS Device
Sub-Model &
> IPSEC).
>
> Do you have any plans to change your draft so that, at a
minimum, one
> can
> reuse already existing Filters as Conditions in the QoS
Policy Model ?
> Thanks.
> JC.