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Chapter 41
Configuring QoS
Figure 41-6 Ethernet Egress Port Scheduling, Congestion Avoidance, and Marking
From switching
engine or MSFC
78-13315-02
Ethernet egress port scheduling, congestion avoidance, and marking
2q2t port
(tail-drop thresholds)
High priority
standard queue
100% for CoS 6 and 7
80% for CoS 4 and 5
Low priority
standard queue
100% for CoS 2 and 3
80% for CoS 0 and 1
1p2q2t port
Strict priority queue
100% for CoS 5
High priority
standard queue
(WRED-drop thresholds)
70%:100% for CoS 6 and 7
40%:70% for CoS 4
Low priority
standard queue
(WRED-drop thresholds)
70%:100% for CoS 2 and 3
40%:70% for CoS 0 and 1
1p3q1t port
Strict priority queue
100% for CoS 5
standard queues
(WRED-drop or
tail-drop thresholds)
High priority
100% for CoS 6 and 7
Medium priority
100% for CoS 2, 3 and 4
Low priority
100% for CoS 0 and 1
(Default values shown)
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
Write ToS
Yes
IP traffic
byte into
from PFC?
packet
No
Write CoS
Yes
ISL or
into
802.1Q?
frame
No
Transmit
frame
Understanding How QoS Works
41-7
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