Configuring Qos; Default Qos Configuration - Cisco WS-C3550-12G Software Configuration Manual
Multilayer switch
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Configuring QoS
Configuring QoS
Before configuring QoS, you must have a thorough understanding of these items:
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This section describes how to configure QoS on your switch. It contains this configuration information:
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Default QoS Configuration
Table 20-1
Table 20-1 Default QoS Parameters when QoS is Disabled
Port
QoS
Type
State
Gigabit-capable
Disabled
Ethernet ports
10/100 Ethernet
Disabled
ports
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).
Table 20-2
Catalyst 3550 Multilayer Switch Software Configuration Guide
20-18
The types of applications used and the traffic patterns on your network.
Traffic characteristics and needs of your network. Is the traffic bursty? Do you need to reserve
bandwidth for voice and video streams?
Bandwidth requirements and speed of the network.
Location of congestion points in the network.
Default QoS Configuration, page 20-18
Enabling QoS Globally, page 20-21
Configuring Classification Using Port Trust States, page 20-21
Configuring a QoS Policy, page 20-26
Configuring DSCP Maps, page 20-39
Configuring Egress Queues on Gigabit-Capable Ethernet Ports, page 20-44
Configuring Egress Queues on 10/100 Ethernet Ports, page 20-51
shows the default QoS configuration when QoS is disabled.
Egress traffic
(DSCP and CoS
Value)
Pass through.
Pass through.
shows the default QoS parameters without any further configuration when QoS is enabled.
Queue
Queue
Weights
All of 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.
Chapter 20
Configuring QoS
Tail-drop
CoS Mapping
Thresholds
to Queue
100%, 100%
All CoS
values map to
WRED is
queue 1.
disabled.
–
All CoS
values map to
queue 1.
78-11194-03
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