QoS Policies
64 Quality of Service Guide
Slope Policy Parameters
The elements required to define a slope policy are:
• A unique policy ID
• The high, low, and exceed RED slope shapes for the buffer pool: the start-avg, max-
avg and max-prob.
• The TAF weighting factor to use for the SBAU calculation for determining RED
slope drop probability.
Unlike access QoS policies where there are distinct policies for ingress and egress, slope
policy is defined with generic parameters so that it is not inherently an ingress or an egress
policy. A slope policy defines ingress properties when it is associated with an access port
buffer pool on ingress and egress properties when it is associated with an access buffer pool
on egress.
Each access port buffer pool can be associated with one slope policy ID on ingress and one
slope policy ID on egress. The slope policy IDs on ingress and egress can be set
independently.
Slope policy ID default is reserved for the default slope policy. The default policy cannot be
deleted or changed. The default slope policy is implicitly applied to all access buffer pools
which do not have another slope policy explicitly assigned.
Table 15 lists the default values for the default slope policy.
Table 15: Default Slope Policy Definition
Parameter Description Setting
Policy ID Slope policy ID 1 (Policy ID 1 reserved for default slope
policy)
High (RED) slope Administrative state Shutdown
start-avg 70% utilization
max-avg 90% utilization
max-prob 80% probability
Low (RED) slope Administrative state Shutdown
start-avg 50% utilization
max-avg 75% utilization
max-prob 80% probability
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