Pfc Qos Configuration Guidelines And Restrictions; Default Values With Pfc Qos Disabled - Cisco 7604 Configuration Manual

PFC QoS Configuration Guidelines and Restrictions

1p2q1t Transmit Queues
Feature
Standard transmit queue 1
(lowest priority)
Standard transmit queue 3
(high priority)
Strict-priority transmit queue

Default Values With PFC QoS Disabled

Feature
Ingress LAN port trust state
Receive-queue drop-threshold percentages
Transmit-queue drop-threshold percentages
Transmit-queue bandwidth allocation ratio
Transmit-queue size ratio
CoS value and drop threshold mapping
PFC QoS Configuration Guidelines and Restrictions
When configuring PFC QoS, follow these guidelines and restrictions:
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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
41-50
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
Threshold 1 CoS
Tail-drop
WRED-drop Enabled; 70% low, 100% high
Threshold 1 CoS
Tail-drop
WRED-drop Enabled; 70% low, 100% high
CoS
Tail-drop
Default Value
trust DSCP.
All thresholds set to 100%.
All thresholds set to 100%.
255:1.
Low priority: 100% (other queues not used).
All QoS labels mapped to the low-priority queue.
Chapter 41 Configuring PFC QoS
Default Value
0, 1, 2, and 3
Not supported
4, 6, and 7
Not supported
5
100% (nonconfigurable)
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