Cisco Catalyst 2360, Software Configuration Manual

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25-3
Catalyst 2360 Switch Software Configuration Guide
OL-19808-01
Chapter 25 Configuring QoS
Configuring QoS
Configuring QoS
These sections contain this configuration information:
•
Default QoS Configuration, page 25-3
• Standard QoS Configuration Guidelines, page 25-4
•
Enabling QoS Globally, page 25-4 (required)
Default QoS Configuration
QoS is disabled. There is no concept of trusted or untrusted ports because the packets are not modified
(the CoS value in the packet is not changed). Traffic is switched in pass-through mode (packets are
switched without any rewrites and classified as best effort).
When QoS is enabled with the mls qos global configuration command and all other QoS settings are at
their defaults, traffic is classified as best effort (the CoS value is set to 0. The default port trust state on
all ports is untrusted. The default egress queue settings are described in the
“Default Egress Queue
Configuration” section on page 25-3 .
Default Egress Queue Configuration
Table 25-1 shows the default egress queue configuration for each queue-set when QoS is enabled. All
ports are mapped to queue-set 1. The port bandwidth limit is set to 100 percent and rate unlimited.
Table 25-2 shows the default CoS output queue threshold map when QoS is enabled.
Table 25-1 Default Egress Queue Configuration
Feature Queue 1 Queue 2 Queue 3 Queue 4
Buffer allocation 25 percent 25 percent 25 percent 25 percent
Threshold 1 100 percent 200 percent 100 percent 100 percent
Threshold 2 100 percent 200 percent 100 percent 100 percent
Reserved threshold 50 percent 50 percent 50 percent 50 percent
Maximum threshold 400 percent 400 percent 400 percent 400 percent
Table 25-2 Default CoS Output Queue Threshold Map
CoS Value Queue ID–Threshold ID
0, 1 2–1
2, 3 3–1
4 4–1
5 1–1
6, 7 4–1