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CFHP Policer Control Policy
Tier 1 and Tier 2 Explicit Arbiters
Other arbiters may be explicitly created in the policy for the purpose of creating an arbitrary
bandwidth distribution hierarchy. The explicitly created arbiters must be defined within tier 1 or
tier 2 on the policy. Tier 1 arbiters must always be parented by the root arbiter and thus becomes a
child of the root arbiter. Any child policers directly parented by a tier 1 policer treat the root arbiter
as its grandparent. Inversely, the root arbiter considers the child policers as grandchildren. All
grandchild policers inherit the priority level of their parent arbiter (the level that the tier 1 arbiter
attaches to the root arbiter) within the parent policer.
An arbiter created on tier 2 may be parented by either an arbiter in tier 1 or by the root arbiter. If
the tier 2 arbiter is parented by the root arbiter, it is internally treated the same as a tier 1 arbiter
and its child policers have a grandchild to grandparent association with the root arbiter.
When a tier 2 arbiter is parented by a tier 1 arbiter, the child policers parented by a tier 2 arbiter are
in a great-grandchild to great-grandparent association with the root arbiter. A great-grandchild
policer inherits its indirectly parented tier 1 arbiter's level association with the root arbiter and thus
the parent policer.
A child policer's priority level on the root arbiter (directly or indirectly) defines which priority
level discards thresholds will be associated with packets mapped to the child policer for use in the
parent policer (assuming the packet is not discarded by its child policer).
Explicit Arbiter Rate Limits
The bandwidth a tier 1 or tier 2 arbiter receives from its parent may be limited by the use of the
rate command within the arbiter. When a rate limit is defined for a root arbiter, the system enforces
the aggregate rate by calculating a per child policer PIR rate based on the distributed bandwidth
per child. This calculated PIR is used to override the child's defined PIR and is represented as the
child's operational PIR. The calculated rate will never be greater than a child policer's provisioned
rate.
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7450 ESS OS Quality of Service Guide
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