Cisco CiscoWork QoS Policy Manager 4.1.2 User Guide
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Appendix B Configure Tab Reference
Policy Groups
B-68
User Guide for QoS Policy Manager 3.0
78-12542-01
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WRED Mapping Dialog Box
Use this dialog box to define WRED mappings for QoS properties and policies.
Table B-48 WRED Mapping Dialog Box
Field
Description
Value
Select the value for which you want to define threshold values—an IP
precedence value, or RSVP.
precedence value, or RSVP.
Precedence values that do not have settings are handled using default values.
Min. Threshold
The minimum number of packets held in the queue. When the average queue
length falls between the minimum and maximum thresholds, packets are
dropped based on the probability denominator. If the average queue size is
lower than the minimum threshold, all packets are queued.
length falls between the minimum and maximum thresholds, packets are
dropped based on the probability denominator. If the average queue size is
lower than the minimum threshold, all packets are queued.
The minimum threshold in QPM can be from 1 to 4096. The default
minimum threshold for precedence 0 is half the maximum threshold. The
default minimums for the remaining values fall at even intervals between this
value and the max threshold.
minimum threshold for precedence 0 is half the maximum threshold. The
default minimums for the remaining values fall at even intervals between this
value and the max threshold.
The average queue size is based on the current size of the queue, the last
calculated average queue size, and the WRED weighting factor for the
interface. See the IOS software documentation for the exact formula.
calculated average queue size, and the WRED weighting factor for the
interface. See the IOS software documentation for the exact formula.
Max. Threshold
The maximum threshold for the queue. When the average queue length
exceeds the maximum threshold, all new packets for the queue are dropped
until the queue drops below the max threshold.
exceeds the maximum threshold, all new packets for the queue are dropped
until the queue drops below the max threshold.
The maximum threshold must be larger than the minimum threshold up to
4096. The default is based on the output buffer capacity of the device and the
speed of the interface.
4096. The default is based on the output buffer capacity of the device and the
speed of the interface.