HSMDA QoS Model
782 Quality of Service Guide
HSMDA Slope Shutdown Behavior
HSMDA slope policies allow the high or low RED slope to be shutdown. This effectively
configures the HSDMA internal slope to have a Start-buffer and end-buffer equal to the
buffer value closest to the configured policy MBS value. Packets matching the slope will still
be discarded based on the slope, but it will appear that the MBS value is being enforced within
the queue. The maximum-discard-probability is set to 100% when the slope is shutdown. The
inverse-slope value sent to the XMA or MDA is set to all zeros 00000000 but has no effect
since the starting and ending buffers are the same.
Ingress Packet Mapping to HSMDA RED Slope
At ingress, the following is used to determine packet mapping to a RED slope:
High slope
• Explicit profile classified as in-profile
• Undefined profile, but classified as high priority
Low slope
• Explicit profile classified as out-of-profile
• Undefined profile, but classified as low priority
Egress Packet Mapping to HSMDA RED Slope
At egress, the following is used to determine packet mapping to a RED slope:
High slope
• Egress reclassified high priority
• Non-reclassified in-profile
Low slope
• Egress reclassified low priority
• Non-reclassified out-of-profile
A default HSMDA slope policy for HSMDA queues with default parameters for the low and
high slopes will be used to mimic the non-HSMDA queue drop tail behavior:
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