Allocating Buffer Space To And Setting Wtd Thresholds For An Egress Queue-Set; Configuration Guidelines - Cisco WS-CBS3032-DEL Software Configuration Manual

Configuring Standard QoS
These sections contain this configuration information:
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Configuration Guidelines

Follow these guidelines when the expedite queue is enabled or the egress queues are serviced based on
their SRR weights:
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Allocating Buffer Space to and Setting WTD Thresholds for an Egress Queue-Set

You can guarantee the availability of buffers, set WTD thresholds, and configure the maximum
allocation for a queue-set by using the mls qos queue-set output qset-id threshold queue-id
drop-threshold1 drop-threshold2 reserved-threshold maximum-threshold global configuration command.
Each threshold value is a percentage of the queue's allocated memory, which you specify by using the
mls qos queue-set output qset-id buffers allocation1 ... allocation4 global configuration command.
The queues use WTD to support distinct drop percentages for different traffic classes.
The egress queue default settings are suitable for most situations. You should change them only when
Note
you have a thorough understanding of the egress queues and if these settings do not meet your QoS
solution.
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
37-86
Configuration Guidelines, page 37-86
Allocating Buffer Space to and Setting WTD Thresholds for an Egress Queue-Set, page 37-86
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Mapping DSCP or CoS Values to an Egress Queue and to a Threshold ID, page 37-88
Configuring SRR Shaped Weights on Egress Queues, page 37-90
Configuring SRR Shared Weights on Egress Queues, page 37-91
Configuring the Egress Expedite Queue, page 37-92
Limiting the Bandwidth on an Egress Interface, page 37-92
If the egress expedite queue is enabled, it overrides the SRR shaped and shared weights for queue 1.
If the egress expedite queue is disabled and the SRR shaped and shared weights are configured, the
shaped mode overrides the shared mode for queue 1, and SRR services this queue in shaped mode.
If the egress expedite queue is disabled and the SRR shaped weights are not configured, SRR
services this queue in shared mode.
Chapter 37
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Configuring QoS
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