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Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
OL-12247-01
Chapter 36 Configuring QoS
Configuring Auto-QoS
Generated Auto-QoS Configuration
By default, auto-QoS is disabled on all ports.
When auto-QoS is enabled, it uses the ingress packet label to categorize traffic, to assign packet labels,
and to configure the ingress and egress queues as shown in
Table 36-2
.
Table 36-3
shows the generated auto-QoS configuration for the ingress queues.
Table 36-4
shows the generated auto-QoS configuration for the egress queues.
When you enable the auto-QoS feature on the first port, these automatic actions occur:
•
QoS is globally enabled (mls qos global configuration command), and other global configuration
commands are added.
•
When you enter the auto qos voip cisco-softphone interface configuration command on a port at
the edge of the network that is connected to a device running the Cisco SoftPhone, the switch uses
policing to determine whether a packet is in or out of profile and to specify the action on the packet.
Table 36-2
Traffic Types, Packet Labels, and Queues
VoIP
1
Data
Traffic
1.
VoIP = voice over IP
VoIP Control
Traffic
Routing Protocol
Traffic
STP BPDU
Traffic
Real-Time
Video Traffic
All Other Traffic
DSCP
46
24, 26
48
56
34
–
CoS
5
3
6
7
4
–
CoS-to-Ingress
Queue Map
2, 3, 4, 5, 6, 7 (queue 2)
0, 1 (queue 1)
CoS-to-Egress
Queue Map
5 (queue 1)
3, 6, 7 (queue 2)
4 (queue 3)
2 (queue 3)
0, 1
(queue 4)
Table 36-3
Auto-QoS Configuration for the Ingress Queues
Ingress Queue
Queue Number
CoS-to-Queue Map
Queue Weight
(Bandwidth)
Queue (Buffer)
Size
SRR shared
1
0, 1
81 percent
67 percent
Priority
2
2, 3, 4, 5, 6, 7
19 percent
33 percent
Table 36-4
Auto-QoS Configuration for the Egress Queues
Egress Queue
Queue Number
CoS-to-Queue Map
Queue Weight
(Bandwidth)
Queue (Buffer) Size
for Gigabit-Capable
Ports
Queue (Buffer)
Size for 10/100
Ethernet Ports
SRR shared
2
3, 6, 7
10 percent
6 percent
10 percent
SRR shared
3
2, 4
60 percent
17 percent
26 percent
SRR shared
4
0, 1
20 percent
61 percent
54 percent
