Cfhp Policer Control Policy - Alcatel-Lucent 7950 Quality Of Service Manual

CFHP Policer Control Policy

Provisioning CFHP entails creating policer control policies (policer-control-policy), applying a
policer control policy to the ingress or egress context of a SAP much the same way scheduler
policies (scheduler-policy) are applied.
Applying a policer control policy to a SAP creates an instance of the policy that is used to control
the bandwidth associated with the child policers on the SAP.
Policer control policies can only be applied to SAPs created on Ethernet ports. When the policy
instance is created, any policers created on the SAP that have an appropriate parent command
defined are considered child policers.
Policer Control Policy Root Arbiter
Similar to a scheduler context within a scheduler-policy, the policer-control-policy contains
objects called an arbiter that control the amount of bandwidth that may be distributed to a set of
child policers. Each policer control policy always contains a root arbiter that represents the parent
policer. The max-rate defined for the arbiter specifies the decrement rate for the parent policer that
governs the overall aggregate rate of every child policer associated with the policy instance. The
root arbiter also contains the parent policers MBS configuration parameters that the system uses to
individually configure the priority thresholds for each policer instance.
Child policers may parent directly to the root arbiter or to one of the tier 1 or tier 2 explicitly
created arbiters.
Each arbiter provides bandwidth to its children using eight strict levels. Children parented at level
8 are first to receive bandwidth. The arbiter continues to distribute bandwidth until either all of its
children's bandwidth requirements are met or until the bandwidth its allowed to distribute is
exhausted. The root arbiter is special in that its strict priority levels directly represent the priority
thresholds within the parent policer.
7950 XRS Quality of Service Guide
Policer Control Policy Root Arbiter
Page 577