Configuring Egress Queues On Gigabit-Capable Ethernet Ports - Cisco Catalyst 3550 series Software Configuration Manual

Chapter 29 Configuring QoS

Configuring Egress Queues on Gigabit-Capable Ethernet Ports

This section describes how to configure the egress queues on Gigabit-capable Ethernet ports. For
information on configuring 10/100 Ethernet ports, see
Ports" section on page
Depending on the complexity of your network and your QoS solution, you might need to perform all of
the tasks in the next sections. You will need to make decisions about these characteristics:
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These sections contain this configuration information:
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Mapping CoS Values to Select Egress Queues
Beginning in privileged EXEC mode, follow these steps to map CoS ingress values to select one of the
egress queues:
Command
Step 1
configure terminal
Step 2
mls qos
Step 3
interface interface-id
78-11194-09
29-64.
Which packets are assigned (by CoS value) to each queue?
How much of the available buffer space (limit) is allotted to each queue?
What drop percentage thresholds apply to each queue and which DSCP values map to each
threshold?
Is one of the queues the expedite (high-priority) egress queue?
How much of the available bandwidth is allotted to each queue?
Mapping CoS Values to Select Egress Queues, page 29-57
Configuring the Egress Queue Size Ratios, page 29-58
Configuring Tail-Drop Threshold Percentages, page 29-59
Configuring WRED Drop Thresholds Percentages, page 29-61
Configuring the Egress Expedite Queue, page 29-62
Allocating Bandwidth among Egress Queues, page 29-63
"Configuring Egress Queues on 10/100 Ethernet
Purpose
Enter global configuration mode.
Enable QoS on the switch.
Enter interface configuration mode, and specify the egress
Gigabit-capable Ethernet interface.
Catalyst 3550 Multilayer Switch Software Configuration Guide
Configuring Standard QoS
29-57