Network Working Group I. Bryskin
Request for Comments: 5394 Adva Optical
Category: Informational D. Papadimitriou
Alcatel
L. Berger
LabN Consulting
J. Ash
AT&T
December 2008
Policy-Enabled Path Computation Framework
Status of This Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
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Abstract
The Path Computation Element (PCE) architecture introduces the
concept of policy in the context of path computation. This document
provides additional details on policy within the PCE architecture and
also provides context for the support of PCE Policy. This document
introduces the use of the Policy Core Information Model (PCIM) as a
framework for supporting path computation policy. This document also
provides representative scenarios for the support of PCE Policy.
Bryskin, et al. Informational [Page 1]RFC 5394 Policy-Enabled Path Computation December 2008Table of Contents
1. Introduction ....................................................2
1.1. Terminology ................................................3
2. Background ......................................................4
2.1. Motivation .................................................4
2.2. Policy Attributes ..........................................6
2.3. Representative Policy Scenarios ............................7
2.3.1. Scenario: Policy Configured Paths ...................7
2.3.2. Scenario: Provider Selection Policy ................10
2.3.3. Scenario: Policy Based Constraints .................12
2.3.4. Scenario: Advanced Load Balancing (ALB) Example ....14
3. Requirements ...................................................16
4. Path Computation Policy Information Model (PCPIM) ..............18
5. Policy-Enabled Path Computation Framework Components ...........20
6. Policy Component Configurations ................................21
6.1. PCC-PCE Configurations ....................................21
6.2. Policy Repositories .......................................24
6.3. Cooperating PCE Configurations ............................25
6.4. Policy Configuration Management ...........................27
7. Inter-Component Communication ..................................27
7.1. Policy Communication ......................................27
7.2. PCE Discovery Policy Considerations .......................29
8. Path Computation Sequence of Events ............................29
8.1. Policy-Enabled PCC, Policy-Enabled PCE ....................29
8.2. Policy-Ignorant PCC, Policy-Enabled PCE ...................31
9. Introduction of New Constraints ................................32
10. Security Considerations .......................................33
11. Acknowledgments ...............................................33
12. References ....................................................34
12.1. Normative References .....................................34
12.2. Informative References ...................................34
1. Introduction
The Path Computation Element (PCE) Architecture is introduced in
[RFC4655]. This document describes the impact of policy-based
decision making when incorporated into the PCE architecture and
provides additional details on, and context for, applying policy
within the PCE architecture.
Policy-based Management (PBM), see [RFC3198], is a network management
approach that enables a network to automatically perform actions in
response to network events or conditions based on pre-established
rules, also denoted as policies, from a network administrator. PBM
datatracker.ietf.org