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Chapter 32
Configuring QoS
Default Standard QoS Configuration
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). Traffic is switched in
pass-through mode (packets are switched without any rewrites and classified as best effort without any
policing).
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 DSCP and CoS value is set to 0) without any policing.
No policy maps are configured. The default port trust state on all ports is untrusted. The default ingress
and egress queue settings are described in the
page 32-31
Default Ingress Queue Configuration
Table 32-6
Table 32-6
Feature
Buffer allocation
Bandwidth allocation
Priority queue bandwidth
WTD drop threshold 1
WTD drop threshold 2
1. The bandwidth is equally shared between the queues. SRR sends packets in shared mode only.
2. Queue 2 is the priority queue. SRR services the priority queue for its configured share before servicing the other queue.
Table 32-7
Table 32-7
CoS Value
0–4
5
6, 7
Table 32-8
Table 32-8
DSCP Value
0–39
40–47
48–63
OL-8915-03
and the
"Default Egress Queue Configuration" section on page
shows the default ingress queue configuration when QoS is enabled.
Default Ingress Queue Configuration
1
2
shows the default CoS input queue threshold map when QoS is enabled.
Default CoS Input Queue Threshold Map
Queue ID–Threshold ID
1–1
2–1
1–1
shows the default DSCP input queue threshold map when QoS is enabled.
Default DSCP Input Queue Threshold Map
Queue ID–Threshold ID
1–1
2–1
1–1
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
"Default Ingress Queue Configuration" section on
Queue 1
90 percent
4
0
100 percent
100 percent
Configuring Standard QoS
32-32.
Queue 2
10 percent
4
10
100 percent
100 percent
32-31
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