User Guide

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Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
78-14099-04
Chapter 31 Configuring PFC QoS
PFC QoS Default Configuration
1p1q8t receive-queue port CoS value and
drop-threshold mapping
Standard receive queue:
• Threshold 1:
– CoS 0
– Tail-drop: 70%
– WRED-drop: 40% low, 70% high
• Threshold 2:
– CoS 1
– Tail-drop: 70%
– WRED-drop: 40% low, 70% high
• Threshold 3:
– CoS 2
– Tail-drop: 80%
– WRED-drop: 50% low, 80% high
• Threshold 4:
– CoS 3
– Tail-drop: 80%
– WRED-drop: 50% low, 80% high
• Threshold 5:
– CoS 4
– Tail-drop: 90%
– WRED-drop: 60% low, 90% high
• Threshold 6:
– CoS 6
– Tail-drop: 90%
– WRED-drop: 60% low, 90% high
• Threshold 6:
– CoS 7
– Tail-drop: 100%
– WRED-drop (enabled): 70% low, 100% high
Strict-priority receive queue:
• CoS 5
• Tail-drop: 100% (nonconfigurable)
Table 31-2 PFC QoS Default Configuration (continued)
Feature Default Value