User Guide

31-30
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
1p3q1t transmit-queue CoS value and
drop-threshold mapping
Standard transmit queue 1 (low priority):
• Threshold 1:
– CoS 0 and 1
– Tail drop (disabled): 100%
– WRED-drop (enabled): 70% low, 100% high
Standard transmit queue 2 (medium priority) tail-drop threshold:
• Threshold 1:
– CoS 2, 3, and 4
– Tail drop (disabled): 100%
– WRED-drop (enabled): 70% low, 100% high
Standard transmit queue 3 (high priority) tail-drop threshold:
• Threshold 1:
– CoS 6 and 7
– Tail drop (disabled): 100%
– WRED-drop (enabled): 70% low, 100% high
Strict-priority receive queue:
• CoS 5
• Tail-drop: 100% (nonconfigurable)
1p2q1t transmit-queue port CoS value and
drop-threshold mapping
Standard transmit queue 1 (low priority):
• Threshold 1:
– CoS 0, 1, 2, and 3
– WRED-drop: 70% low, 100% high
Standard transmit queue 2 (high priority) WRED-drop threshold:
• Threshold 1:
– CoS CoS 4, 6, and 7
– WRED-drop: 70% low, 100% high
Strict-priority receive queue:
• CoS 5
• Tail-drop: 100% (nonconfigurable)
With PFC QoS disabled
Ingress LAN port trust state trust-dscp
Receive-queue drop-threshold percentages All thresholds set to 100%
Transmit-queue drop-threshold
percentages
All thresholds set to 100%
Transmit-queue bandwidth allocation ratio 255:1
Table 31-2 PFC QoS Default Configuration (continued)
Feature Default Value