Introduction
Page 28 7750 SR OS Services Guide
Service Policies
Common to all SR-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 SR-Series service enhancements. The types of policies that are common to all SR-Series
connectivity services are:
• SAP Quality of Service (QoS) policies which allow for different classes of traffic within a
service at SAP ingress and SAP egress.
QoS ingress and egress policies determine the QoS characteristics for a SAP. A QoS
policy applied to a SAP specifies the number of queues, queue characteristics (such as
forwarding class, committed, and peak information rates, etc.) and the mapping of traffic
to a forwarding class. A QoS policy must be created before it can be applied to a SAP. A
single ingress and a single egress QoS policy can be associated with a SAP.
• 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 hierarchy and operating parameters for virtual schedulers.
Schedulers are divided into groups based on the tier each scheduler is created under. A tier
is used to give structure to the schedulers within a policy and define rules for parent
scheduler associations.
• Accounting policies define how to count the traffic usage for a service for billing
purposes.
The SR-Series 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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