Generated Auto-Qos Configuration - Cisco Catalyst 3120 Software Manual

Chapter 36 Configuring 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 Traffic Types, Packet Labels, and Queues
1
VoIP
Traffic
DSCP 46
CoS 5
CoS-to-Ingress 2, 3, 4, 5, 6, 7 (queue 2)
Queue Map
CoS-to-Egress 5 (queue 1)
Queue Map
1. VoIP = voice over IP
Table 36-3
Table 36-3
Ingress Queue
SRR shared
Priority
Table 36-4
Table 36-4 Auto-QoS Configuration for the Egress Queues
Egress Queue Queue Number
SRR shared 2
SRR shared 3
SRR shared 4
When you enable the auto-QoS feature on the first port, these automatic actions occur:
•
•
OL-12247-01
Data VoIP Control Routing Protocol
Traffic Traffic
24, 26 48
3 6
3, 6, 7 (queue 2)
shows the generated auto-QoS configuration for the ingress queues.
Auto-QoS Configuration for the Ingress Queues
Queue Number
1
2
shows the generated auto-QoS configuration for the egress queues.
CoS-to-Queue Map
3, 6, 7
2, 4
0, 1
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
STP BPDU Real-Time
Traffic Video Traffic
56 34
7 4
4 (queue 3)
CoS-to-Queue Map
0, 1
2, 3, 4, 5, 6, 7
Queue (Buffer) Size
Queue Weight for Gigabit-Capable
(Bandwidth) Ports
10 percent 6 percent
60 percent 17 percent
20 percent 61 percent
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
Configuring Auto-QoS
36-2.
All Other Traffic
–
–
0, 1 (queue 1)
2 (queue 3)
Queue Weight Queue (Buffer)
(Bandwidth) Size
81 percent 67 percent
19 percent 33 percent
Queue (Buffer)
Size for 10/100
Ethernet Ports
10 percent
26 percent
54 percent
0, 1
(queue 4)
36-21