Configuring Standard Qos - Cisco Catalyst 3550 series Software Configuration Manual
Multilayer switch
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Also See for Catalyst 3550 series:
- Reference manual (58 pages) ,
- Datasheet (21 pages) ,
- Manual (19 pages)
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Chapter 29
Configuring QoS
Configuring Standard QoS
Before configuring standard QoS, you must have a thorough understanding of these items:
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These sections describe how to configure standard QoS on your switch:
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Default Standard QoS Configuration
Table 29-4
Table 29-4 Default Standard QoS Configuration 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 29-5
is enabled.
78-11194-09
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 Standard QoS Configuration, page 29-25
Standard QoS Configuration Guidelines, page 29-26
Enabling QoS Globally, page 29-28
Configuring Classification By Using Port Trust States, page 29-29
Configuring a QoS Policy, page 29-35
Configuring DSCP Maps, page 29-51
Configuring Egress Queues on Gigabit-Capable Ethernet Ports, page 29-57
Configuring Egress Queues on 10/100 Ethernet Ports, page 29-64
shows the default standard QoS configuration when QoS is disabled.
Egress traffic
(DSCP and CoS
Value)
Pass through.
Pass through.
shows the default standard QoS configuration without any further configuration when QoS
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.
Catalyst 3550 Multilayer Switch Software Configuration Guide
Configuring Standard 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.
29-25
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