Cisco 7604 User Manual

41-50
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 41 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 41-51
• PFC3 Guidelines, page 41-53
• PFC2 Guidelines, page 41-53
• Class Map Command Restrictions, page 41-54
• Policy Map Command Restrictions, page 41-54
• Policy Map Class Command Restrictions, page 41-54
• Supported Granularity for CIR and PIR Rate Values, page 41-55
• Supported Granularity for CIR and PIR Token Bucket Sizes, page 41-55
• IP Precedence and DSCP Values, page 41-56
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.

Cisco 7604 Specifications

General

Brand	Cisco
Model	7604
Category	Network Router
Language	English