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traffic is assigned to queue 1. If you enable QoS, modify the CoS−to−transmit queue
mappings.
Q. How do the QoS features on the Catalyst 4500/4000 switches that run
CatOS compare to Catalyst 4500/4000 switches that run Cisco IOS
Software? How do the features compare with the features of the Layer 3
(L3) switching module?
A. The Catalyst 4500/4000 is available in three configurations that vary with the supported
QoS features. This table summarizes these variations:
2
MQC
support
Switch−wide
QoS
Per−port QoS
Transmit
queues per
port
Receive
queues per
port
Scheduling
Strict priority
queue
Congestion
avoidance
Policers
(ingress)
Supervisor
Engine I/II
(Which
1
Includes L2
Ports on an
L3 Module
That Runs
WS−X4232−L3
CatOS)
Module (L3
Gigabit Ports
Only)
No
No
Yes
N/A
No
Yes
3
2Q1T
Map
4
CoS
values
to queues
5
4Q
with the set
qos map
command
N/A
N/A
7
WRR
with the
qos mapping
Round−robin
precedence value
wrr−weight
weight command
No
No
No
No
N/A
Yes, with the
rate−limit input
Cisco IOS
Software
(Supervisor
Engine II+,
III, IV, and
Yes
V)
Yes
Yes
4Q
6
N/A
Round−robin,
WRR, or strict
priority
Yes, with the
tx−queue 3
priority high
command
8
Yes, DBL
is
available on
Supervisor
Engine IV
Yes, up to 1K
9
policers
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