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Cisco Systems Intelligent Gigabit Ethernet Switch Modules for the IBM BladeCenter, Software Configuration Guide
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Chapter 23 Configuring QoS
Configuring Auto-QoS
Configuring Auto-QoS
You can use the auto-QoS feature to simplify the deployment of existing QoS features. Auto-QoS makes
assumptions about the network design, and as a result, the switch can prioritize different traffic flows
and appropriately use the egress queues instead of using the default QoS behavior (the switch offers
best-effort service to each packet regardless of the packet contents or size and sends it from a single
queue).
assumptions about the network design, and as a result, the switch can prioritize different traffic flows
and appropriately use the egress queues instead of using the default QoS behavior (the switch offers
best-effort service to each packet regardless of the packet contents or size and sends it from a single
queue).
When you enable auto-QoS, it automatically classifies traffic based on the traffic type and ingress packet
label. The switch uses the resulting classification to choose the appropriate egress queue.
label. The switch uses the resulting classification to choose the appropriate egress queue.
You use auto-QoS commands to identify ports connected to Cisco IP Phones. You also use the
commands to identify ports that receive trusted traffic through an uplink. Auto-QoS then performs these
functions:
commands to identify ports that receive trusted traffic through an uplink. Auto-QoS then performs these
functions:
•
Detects the presence or absence of IP phones
•
Configures QoS classification
•
Configures egress queues
These sections describe how to configure auto-QoS on your switch:
•
•
•
•
Generated Auto-QoS Configuration
When auto-QoS is enabled, it uses the ingress packet label to classify traffic and to configure the egress
queues as described in
queues as described in
.
Table 23-2
Traffic Types, Packet Labels, and Egress Queues
VoIP
1
Data
Traffic
1.
VoIP = voice over IP
VoIP Control
Traffic
Traffic
Routing Protocol
Traffic
Traffic
STP BPDU
2
Traffic
2.
BPDU = bridge protocol data unit
Real-Time
Video Traffic
Video Traffic
All Other Traffic
DSCP
46
24, 26
48
56
34
–
CoS
5
3
6
7
4
CoS-to-Queue
Map
Map
5
3, 6, 7
4
2
0, 1
Egress Queue
1% WRR
(queue 4)
(queue 4)
70% WRR (queue 3)
20% WRR
(queue 2)
(queue 2)
20% WRR
(queue 2)
(queue 2)
10% WRR
(queue 1)
(queue 1)