Qos Configuration Guidelines And Restrictions - Cisco WS-C6506 Software Manual

Chapter 52 Configuring QoS
Table 52-3 QoS Default Configuration (continued)
Feature
Transmit-queue drop-threshold
percentages
Transmit-queue low-priority/high-priority
bandwidth allocation ratio
Transmit-queue size ratio
CoS value/drop-threshold mapping
1. COPS = Common Open Policy Service

QoS Configuration Guidelines and Restrictions

QoS has the following hardware granularity for the committed information rate (CIR) and the peak
information rate (PIR) values:
CIR and PIR Rate Value Range
134217729 to 268435456 (256 Mbs)
268435457 to 536870912 (512 Mbs)
536870913 to 1073741824
1073741825 to 2147483648
2147483649 to 4294967296
4294967297 to 8000000000
Within each range, PFC QoS programs the PFC hardware with the rate values that are multiples of the
granularity values.
OL-8978-04
Default Value
All thresholds set to 100%
255:1
Low priority: 100%
•
High priority: Not used
•
Receive-drop threshold 1 and transmit-queue 1/drop threshold 1: CoS 0–7
1 to 2097152
2097153 to 4194304
4194305 to 8388608
8388609 to 16777216 (16 Mbs)
16777217 to 33554432 (32 Mbs)
33554433 to 67108864 (64 Mbs)
67108865 to 134217728 (128 Mbs)
Granularity
(2 Mbs) 65536 (64 Kb)
(4 Mbs) 131072 (128 Kb)
(8 Mbs) 262144 (256 Kb)
524288 (512 Kb)
1048576 (1 Mb)
2097152 (2 Mb)
4194304 (4 Mb)
8388608 (8 Mb)
16777216 (16 Mb)
(1 Gps) 33554432 (32 Mb)
(2 Gps) 67108864 (64 Mb)
(4 Gps) 134217728 (128 Mb)
(8 Gps) 268435456 (256 Mb)
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
QoS Configuration Guidelines and Restrictions
52-37