Cisco 7604 Configuration Manual page 627

Chapter 41 Configuring PFC QoS
Figure 41-10
configurations function similarly.
Figure 41-10 Receive Queue Drop Thresholds
Reserved for
CoS 6 and 7
Reserved for
CoS 4 and higher
Reserved for
CoS 2 and higher
Available for
traffic with any
CoS value
100% available for CoS 6 and 7
80% available for CoS 4 and 5
60% available for CoS 2 and 3
50% available for CoS 0 and 1
Ingress Queue Types
To see the queue structure of a LAN port, enter the show queueing interface {ethernet | fastethernet |
gigabitethernet | tengigabitethernet} slot/port | include type command. The command displays one of
the following architectures:
•
•
•
•
•
•
•
OL-4266-08
illustrates the drop thresholds for a 1q4t ingress LAN port. Drop thresholds in other
Drop threshold 4: 100%
Drop threshold 3: 80%
Drop threshold 2: 60%
Drop threshold 1: 50%
Receive queue
1q2t indicates one standard queue with one configurable tail-drop threshold and one
nonconfigurable tail-drop threshold.
1q4t indicates one standard queue with four configurable tail-drop thresholds.
1q8t indicates one standard queue with eight configurable tail-drop thresholds.
2q8t indicates two standard queues, each with eight configurable tail-drop thresholds.
8q4t indicates eight standard queues, each with four thresholds, each configurable as either
WRED-drop or tail-drop.
8q8t indicates eight standard queues, each with eight thresholds, each configurable as either
WRED-drop or tail-drop.
1p1q4t indicates:
– One strict-priority queue
– One standard queue with four configurable tail-drop thresholds.
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
Understanding How PFC QoS Works
Traffic is dropped
(Default values shown)
41-25