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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 52 Configuring QoS
QoS Configuration Guidelines and Restrictions
QoS Configuration Guidelines and Restrictions
QoS has the following hardware granularity for the committed information rate (CIR) and the peak
information rate (PIR) values:
Within each range, PFC QoS programs the PFC hardware with the rate values that are multiples of the
granularity values.
Transmit-queue drop-threshold
percentages
All thresholds set to 100%
Transmit-queue low-priority/high-priority
bandwidth allocation ratio
255:1
Transmit-queue size ratio
• Low priority: 100%
• High priority: Not used
CoS value/drop-threshold mapping Receive-drop threshold 1 and transmit-queue 1/drop threshold 1: CoS 0–7
1. COPS = Common Open Policy Service
Table 52-3 QoS Default Configuration (continued)
Feature Default Value
CIR and PIR Rate Value Range Granularity
1 to 2097152 (2 Mbs) 65536 (64 Kb)
2097153 to 4194304 (4 Mbs) 131072 (128 Kb)
4194305 to 8388608 (8 Mbs) 262144 (256 Kb)
8388609 to 16777216 (16 Mbs) 524288 (512 Kb)
16777217 to 33554432 (32 Mbs) 1048576 (1 Mb)
33554433 to 67108864 (64 Mbs) 2097152 (2 Mb)
67108865 to 134217728 (128 Mbs) 4194304 (4 Mb)
134217729 to 268435456 (256 Mbs) 8388608 (8 Mb)
268435457 to 536870912 (512 Mbs) 16777216 (16 Mb)
536870913 to 1073741824 (1 Gps) 33554432 (32 Mb)
1073741825 to 2147483648 (2 Gps) 67108864 (64 Mb)
2147483649 to 4294967296 (4 Gps) 134217728 (128 Mb)
4294967297 to 8000000000 (8 Gps) 268435456 (256 Mb)
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