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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 42 Configuring PFC QoS
PFC QoS Configuration Guidelines and Restrictions
1p2q1t Transmit Queues
Default Values With PFC QoS Disabled
PFC QoS Configuration Guidelines and Restrictions
When configuring PFC QoS, follow these guidelines and restrictions:
• General Guidelines, page 42-50
• PFC3 Guidelines, page 42-51
• PFC2 Guidelines, page 42-52
• Class Map Command Restrictions, page 42-53
• Policy Map Command Restrictions, page 42-53
• Policy Map Class Command Restrictions, page 42-53
• Supported Granularity for CIR and PIR Rate Values, page 42-53
• Supported Granularity for CIR and PIR Token Bucket Sizes, page 42-54
• IP Precedence and DSCP Values, page 42-55
Feature Default Value
Standard transmit queue 1
(lowest priority)
Threshold 1 CoS 0, 1, 2, and 3
Tail-drop Not supported
WRED-drop Enabled; 70% low, 100% high
Standard transmit queue 3
(high priority)
Threshold 1 CoS 4, 6, and 7
Tail-drop Not supported
WRED-drop Enabled; 70% low, 100% high
Strict-priority transmit queue CoS 5
Tail-drop 100% (nonconfigurable)
Feature Default Value
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.
Transmit-queue size ratio Low priority: 100% (other queues not used).
CoS value and drop threshold mapping All QoS labels mapped to the low-priority queue.