Cisco WS-C3750-48PS-S Software Configuration Manual page 643

Chapter 32 Configuring QoS
Table 32-2 Traffic Types, Packet Labels, and Queues
1
VoIP
Traffic
DSCP 46
CoS 5
CoS-to-Ingress
Queue Map
CoS-to-Egress 5 (queue 1)
Queue Map
1. VoIP = voice over IP
Table 32-3
Table 32-3 Auto-QoS Configuration for the Ingress Queues
Ingress Queue
SRR shared
Priority
Table 32-4
Table 32-4 Auto-QoS Configuration for the Egress Queues
Egress Queue Queue Number
Priority (shaped) 1
SRR shared 2
SRR shared 3
SRR shared 4
When you enable the auto-QoS feature on the first port, these automatic actions occur:
•
•
•
78-16180-02
Data VoIP Control Routing Protocol
Traffic Traffic
24, 26 48
3 6
2, 3, 4, 5, 6, 7 (queue 2)
3, 6, 7 (queue 2)
shows the generated 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
5
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-phone interface configuration command on a port at the
edge of the network that is connected to a Cisco IP Phone, the switch enables the trusted boundary
feature. The switch uses the Cisco Discovery Protocol (CDP) to detect the presence or absence of a
Cisco IP Phone. When a Cisco IP Phone is detected, the ingress classification on the port is set to
trust the QoS label received in the packet. When a Cisco IP Phone is absent, the ingress classification
is set to not trust the QoS label in the packet. The switch configures ingress and egress queues on
the port according to the settings in
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 decide whether a packet is in or out of profile and to specify the action on the packet. If
STP BPDU Real-Time
Traffic Video Traffic
56 34
7 4
4 (queue 3)
Queue Weight
CoS-to-Queue Map (Bandwidth)
0, 1 81 percent
2, 3, 4, 5, 6, 7 19 percent
Queue (Buffer) Size
Queue Weight for Gigabit-Capable
(Bandwidth) Ports
10 percent 16 percent
10 percent 6 percent
60 percent 17 percent
20 percent 61 percent
Table 32-3 and Table 32-4.
Catalyst 3750 Switch Software Configuration Guide
Configuring Auto-QoS
All Other Traffic
–
–
0, 1 (queue 1)
2 (queue 3) 0, 1
(queue 4)
Queue (Buffer)
Size
67 percent
33 percent
Queue (Buffer)
Size for 10/100
Ethernet Ports
10 percent
10 percent
26 percent
54 percent
32-19