Editing Common Open Policy Service

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The '''Common Open Policy Service''' ('''COPS''') Protocol is part of the [[internet protocol suite]] as defined by the {{IETF RFC|2748}}. COPS specifies a simple client/server model for supporting policy control over [[quality of service]] (QoS) signaling protocols (e.g. [[Resource Reservation Protocol|RSVP]]). Policies are stored on servers, and acted upon by Policy Decision Points (PDP), and are enforced on clients, also known as Policy Enforcement Points (PEP). There are two models of COPS: The Outsourcing Model and the Provisioning Model, considered from the view of the client or PEP.

The Outsourcing Model is the simplest COPS implementation. In this model, all policies are stored at the PDP. Whenever the PEP needs to make a decision, it sends all relevant information to the PDP. The PDP analyzes the information, makes the decision, and relays it to the PEP. The PEP then simply enforces the decision.

In the Provisioning Model, see {{IETF RFC|3084}} COPS Usage for Policy Provisioning (COPS-PR), the PEP reports its decision-making capabilities to the PDP. The PDP then downloads relevant policies on to the PEP. The PEP can then make its own decisions based on these policies. The Provisioning Model uses the Policy Information Base as a repository of the policies.

==External links==
* The [https://tools.ietf.org/html/draft-carrozzo-aaa-cops-maid-00 COPS-MAID] Internet Draft introduces QoS extensions to the protocol for Multi-Access environment.
* [https://web.archive.org/web/20070904213834/http://www-staff.it.uts.edu.au/~simmonds/BB.htm COPS implementations]
* [http://search.cpan.org/~shamrock/COPS-Client-0.05/lib/COPS/Client.pm Open source COPS client]

[[Category:Internet protocols]]

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[[ja:ポリシーベース・ネットワーク管理#ポリシーにもとづく決定の要求・配布方式]]