RE: policy time period condition in diffserv PIB

Saurabh,

You are correct. Also, to answer your question: “But the doubt I have is when does the PDP actually create two PIB instance. Is it that if the PDP wants to have more PIB instances it forces the PEP for sending another REQ ???” -- Yes

Tina Iliff

-----Original Message-----
From: Saurabh kapoor [mailto:saurabh.kapoor@wipro.com]
Sent: Friday, August 03, 2001 5:42 AM
To: Iliff, Tina; Ponnappan Appan
Cc: V V V Satya Naganna; rap@ops.ietf.org
Subject: Re: policy time period condition in diffserv PIB

My understanding of the active and deactivate PIB instances is that the [COPS-PR] supports multiple, disjoint, independent instances of the PIB to represent multiple instances of configured policy. The motive is to allow for the pre-provisioning of policy that can then be made active by a single, short decision from the PDP. ( The PEP has to mandate only the policies described in the active PIB instance )

As stated by you, although many PIB instances may be configured on a device only one of them can be active at any given time, the active one being selected by the PDP. To facilitate this selection, the Framework PIB supports an attribute to make a PIB instance the
active one and, similarly, to report the active PIB instance to the PDP in a COPS request message. Setting the attribute frwkPibIncarnationActive in the Incarnation Table to 'true' in one PIB instance MUST ensure that the attribute is 'false' in all other contexts.

Regarding the creation and deletion of these PIB instances: Each PIB instance is identified by a context. A COPS context can be defined as an independent COPS request state for a particular subject category (client-type). Each of these states is identified by a unique client handle in the COPS-PR Protocol.

But the doubt I have is when does the PDP actually create two PIB instance. Is it that if the PDP wants to have more PIB instances it forces the PEP for sending another REQ ???

Saurabh Kapoor
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----- Original Message -----

From: Ponnappan Appan

To: Iliff, Tina

Cc: Saurabh kapoor ; rap@ops.ietf.org ; V V V Satya Naganna ; Radhika ; Attili Venkata Ravi Kishore

Sent: Friday, August 03, 2001 2:46 PM

Subject: Re: policy time period condition in diffserv PIB

Hi,

I have some questions on your suggestion of using multiple request-state
feature in COPS-PR and pibIncarnationTable in framework PIB, for activating/de-activating policy rules:

1. In your solution, is there:
    a. one PIB instance for all the policy rules which are active all the time,
         corresponding to the client handle that is used when the PEP connects
         first time?
    b. one PIB instance for each distinct "time-of-day" class instance defined
         in the policy rules?

2. What does activate and de-activate mean for a PIB instance? This does
not seem to be explained in framework PIB. It also says that there can
be only one PIB instance active.

"Iliff, Tina" wrote:

Another alternative would be for the PDP to install all policies with only one being active.Then, when the active context should change the PDP would send a Unsolicited DEC (with the Install command and the Handle of the correct "Time-of-day" request-state) and only one instance of the frwkPibIncarnation class with the Active attribute set to True.

Tina Iliff

-----Original Message-----
From: Ponnappan Appan [mailto:appan@krdl.org.sg]
Sent: Thursday, August 02, 2001 4:57 AM
To: Saurabh kapoor
Cc: rap@ops.ietf.org; V V V Satya Naganna; Radhika; Attili Venkata Ravi Kishore
Subject: Re: policy time period condition in diffserv PIB

The PDP takes care of scheduling the rules and NOT the PEP.
The PDP can send an unsolicited COPS DEC message with 'install' when the scheduling
period starts. Similarly it sends an unsolicited COPS DEC message with 'remove' when
the period ends.

Saurabh kapoor wrote:

Hi,The draft-ietf-diffserv-pib-03.txt does not seem to contain policy time
period condition as specified in PCIM.How can a PDP push a set of policies and mandate that the policies should be active
only during the Time Period as specified in the policies?( For example certain set policies are to be active between 9:00 to 6:00, how can this time information of the policy be fitted into the PIB ?)Regards,Saurabh Kapoor