CFHP Policer Control Policy
856 Quality of Service Guide
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.
CFHP with Child Policer Exceed PIR Enabled
A child policer parented to an arbiter can be enabled to forward traffic exceeding its PIR, in
which case:
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