QoS Admission Control Policies

A policy is a specification of resource limits. Policy is central to any implementation of QoS. Policy must be applied when deciding which traffic is eligible for preferential treatment. As a result, QoS deployment must include the following policy components:

• Data-store. Contains the policy parameters, such as user names, and the network resources to which these are entitled. For the Windows 2000 QoS ACS, the policy store is Active Directory.
• Policy Decision Points (PDPs). Inspects resource requests and accepts or rejects them based on the applicable policy. In Windows 2000 QoS ACS, this is the Local Policy Module (LPM).
• Policy Enforcement Points (PEPs). Acts on PDP decisions. Network devices that physically or logically grant resources to flows. For the Windows 2000 QoS ACS, PEPs are routers, switches, or DSBMs.

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