QoS Policies
7210 SAS D, E, K OS Quality of Service Guide Page 73
Table 27 lists the mapping from drop-rate scalar value to percent value.
Table 27: Drop Rate Value to Percent Mapping Values
Slope Policy Parameters for 7210 SAS-D
The elements required to define a slope policy are:
• A unique policy ID
• The high and low RED slope shapes for the buffer pool: settings for the high-priority and
low-priority RED slopes or The high-slope (for tcp in-profile packets), low-slope (for tcp
out-of-profile packets) and non-tcp slope (for non-tcp packets). All three slopes are on a
per port per queue basis.
• Configurable parameters on each slope are start-avg, max-avg,max-prob and time
averaging-factor (TAF).
A slope policy is defined with generic parameters so that it is not inherently an access or an
network policy. A slope policy defines access egress buffer management properties when it is
associated with an access port buffer pool and network egress buffer management properties when
it is associated with a network port buffer pool.
Low (RED) slope Administrative state Shutdown
start-avg 50% utilization
max-avg 75% utilization
max-prob 80% probability
TAF Time average factor 7
Drop Rate % Drop Rate
0 100% cliff drop.
1 6.25%.
2 3.125%.
3 1.5625%.
4 0.78125%.
5 0.390625%.
6 0.1953125%.
7 0.09765625%.
Parameter Description Setting
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