Introduction
Page 26 7210 SAS M Services Guide
Service Policies
Common to all 7210 SAS-Series connectivity services are policies that are assigned to the service.
Policies are defined at a global level and then applied to a service on the router. Policies are used
to define 7210 SAS-Series service enhancements. The types of policies that are common to all
7210 SAS-Series connectivity services are:
• SAP Quality of Service (QoS) policies which allow for different classes of traffic within a
service at SAP ingress and access egress.
QoS ingress and egress policies determine the QoS characteristics for a SAP. A QoS
ingress policy applied to a SAP specifies the number of meters, meter characteristics (such
as forwarding class, committed, and peak information rates, etc.) and the mapping of
traffic to a forwarding class. A QoS egress policy defines the queue characteristics (such
as CBS, CIR, PIR). A QoS policy must be created before it can be applied to a SAP. A
single ingress and egress QoS policy can be associated with a SAP. A single access egress
QoS policy can be associated with a port.
• Filter policies allow selective blocking of traffic matching criteria from ingressing or
egressing a SAP.
Filter policies, also referred to as access control lists (ACLs), control the traffic allowed in
or out of a SAP based on MAC or IP match criteria. Associating a filter policy on a SAP is
optional. Filter policies are identified by a unique filter policy ID. A filter policy must be
created before it can be applied to a SAP. A single ingress and single egress filter policy
can be associated with a SAP.
• Scheduler policies define the operating parameters (such as scheduling algorithm, weights
per priority). They are associated with physical ports.
• Accounting policies define how to count the traffic usage for a service for billing
purposes.
The routers provide a comprehensive set of service-related counters. Accounting data can
be collected on a per-service, per-forwarding class basis, which enables network operators
to accurately measure network usage and bill each customer for each individual service
using any of a number of different billing models.
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