QoS Overview
Page 72 7210 SAS D, E, K OS Quality of Service Guide
Slope Policy Parameters for 7210 SAS-E devices
The elements required to define a slope policy are:
• A unique policy ID.
• The high and low RED slope shapes for the buffer pool: start-threshold, drop-rate per
egress queue settings for the high-priority and low-priority RED slopes.
• If two slopes are used, then user needs to configure high-priority slope and low -priority
slope parameters.
All slopes are available per queue and the following parameters are configurable for each slope:
• start-avg
• max-avg
• max-prob
A slope policy is defined with generic parameters so that it is not inherently an access or an access
uplink policy. A slope policy defines access egress buffer management properties, when it is
associated with an access port buffer pool and access uplink egress buffer management properties
when it is associated with an access uplink port buffer pool.
Each access egress buffer pool and access uplink egress pool can be associated with only one slope
policy ID. 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 and access
uplink buffer pools which do not have another slope policy explicitly assigned.
Table 26 lists the default values for the default slope policy.
Table 26: 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
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