QoS%20Policy%20Info%20Model

1
QoS Policy Info Model

• Yoram Snir, Yoram Ramberg,John Strassner, Ron
  Cohen
• Cisco Systems
• draft-ietf-policy-qos-info-model-00.txt

2
Agenda - QoS Info Model

• Status
• Objectives of this Info Model
• Relation to QoS Device Info Model
• Extensions to Policy Info Model
• Repositories
• Hierarchy and Scoping
• Decision Making
• Forming QoS Policies
• Actions
• Variables and Constants
• Open Issues and Wrapup

3
Status

• Changes
• Minor changes per WG comments
• Values - added granularity
• QoS Actions
• Provisioning - terminology, tracking DiffServ WG
  changes
• RSVP - terminology, RSVP signal and install
  control.
• Added examples changes to match latest Core
  draft
• Extensions to Core Model
• Decision process extension to allow Rule nesting
  and rule / group interaction

4
Objectives

• Extends the core information model to refine the
  concepts of repositories, conditions and actions
  for expressing QoS policy rules
• Interoperability and Consistency - ensure that
  devices of different capabilities interpret QoS
  mechanisms the same way
• Hierarchical namespaces for administration and
  policy scoping
• Rich semantics - ability to define at a high-, a
  device-independent, or a device-dependent level
• Reusability - for conditions and actions

5
Policy Layers

• Administrator-defined device- and
  technology-independent IF User is Subscribed to
  Gold Service, THEN Allow use of NetMeeting and
  provide premium data services
• Device-independent policy rules If
  SourceIPAddress 172.3.128.0/15,THEN Mark
  Voice with EF and Data with AF11
• Device-independent, mechanism-dependent policy
  configuration take three forms ...
• configure component so it can be used to
  condition forwarded traffic
• configure component so it can act on traffic
  directly
• trigger action based on network or system event
  (e.g., link failure)
• And perform a set of device-independent
  actions
• configure classifier
• configure filter and bind to classifier

6
QoS Extensions Additions to the Core Info Model

• Extensions
• Reusable-objects repositories
• QoS policy conditions and actions
• Additions
• Nested rules and sub-rules
• Decision strategy
• Predefined variables and constants
• Place holders for PHBs

7
Reusable-objects Repositories

• Purpose
• Containers for reusable objects
• Maintenance mechanism for reusable objects
• Provide hierarchical namespace and context for
  reusable objects
• Requirements
• Unique name
• Referenced by pointer
• Repository structure

8
Repository Structure
9
Containment Hierarchy Policy Scope
Defines the root of an administrative domain
Contains a set of similar policies
Scoped by the named container
Conditions and actions relevant to a policy rule
10
Policy Hierarchical Namespaces
11
Example for a decision process
12
QoS Policy Rule

• Time condition
• Conditions - Boolean Expression
• Actions - Ordered
• Rule attributes
• Priority

13
QoS Policy Rule (provisioning actions)
14
Complex Condition Example
15
QoS Actions

• Ordered
• Diff-Serv classification Actions
• Color action (mark)
• Police to specified traffic profile
• Shape to specified traffic profile
• Int-Serv Actions
• RSVP action
• Signal control.
• Install Actions.

16
QoS Variables and constants

• Structure
• Variable ltName, Value Type, Constraintsgt
• Value ltDatagt
• Defined Types
• integer, IP address (IPv4 / IPv6), String, Bit
  String, ...
• Variables Binding
• Layer2, layer 3, application, user.

17
Open Issues

• Predefined values as part of the Policy WG
  drafts.
• ABNF