Mls Qos - Cisco Catalyst 3550 Command Reference Manual
Multilayer switch
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mls qos
mls qos
Use the mls qos global configuration command to enable quality of service (QoS) for the entire switch.
When the mls qos command is entered, QoS is enabled with the default parameters on all ports in the
system. Use the no form of this command to reset all the QoS-related statistics and to disable the QoS
features for the entire switch.
Syntax Description
This command has no arguments or keywords.
Defaults
QoS is disabled.
Table 2-5
Default QoS Configuration when QoS is Disabled
Port
QoS
Type
State
Gigabit-capable
Disabled
Ethernet ports
10/100 Ethernet
Disabled
ports
1. Differentiated Services Code Point
2. Class of service
3. Weighted Random Early Detection
When QoS is disabled, there is no concept of trusted or untrusted ports because the packets are not
modified (the CoS, DSCP, and IP precedence values in the packet are not changed).
Catalyst 3550 Multilayer Switch Command Reference
2-240
mls qos
no mls qos
Table 2-5
shows the default QoS settings when QoS is disabled.
Egress traffic
1
2
(DSCP
and CoS
Value)
Pass through.
Pass through.
Chapter 2
Queue
Queue
Weights
All the queue RAM
–
is allocated to queue
1 (no expedite
queue).
Each of the eight
–
minimum-reserve
levels have a buffer
size of 100 packets.
The queue selects
the level.
Catalyst 3550 Switch Cisco IOS Commands
Tail-drop
CoS Mapping
Thresholds
to Queue
100%, 100%
All CoS values
map to queue 1.
3
WRED
is
disabled.
–
All CoS values
map to queue 1.
OL-8566-02
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