Cisco IE-3000-8TC Software Configuration Guide - Page 680

Configuring Auto-QoS Chapter 36 Configuring QoS Table 36-3 shows the generated auto-QoS configuration for the ingress queues. Table 36-3 Auto-QoS Configuration for the Ingress Queues Ingress Queue SRR shared Priority Queue Number 1 2 CoS-to-Queue Map 0, 1 2, 3, 4, 5, 6, 7 Queue Weight (Bandwidth) 81 percent 19 percent Queue (Buffer) Size 67 percent 33 percent Table 36-4 shows the generated auto-QoS configuration for the egress queues. Table 36-4 Auto-QoS Configuration for the Egress Queues Egress Queue Priority SRR shared SRR shared SRR shared Queue Number CoS-to-Queue Map 1 5 2 3, 6, 7 3 2, 4 4 0, 1 Queue Weight (Bandwidth) up to100 percent 10 percent 60 percent 20 percent Queue (Buffer) Size Queue (Buffer) for Gigabit-Capable Size for 10/100 Ports Ethernet Ports 16 percent 10 percent 6 percent 10 percent 17 percent 26 percent 61 percent 54 percent 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-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. The switch also uses policing to determine whether a packet is in or out of profile and to specify the action on the packet. If the packet does not have a DSCP value of 24, 26, or 46 or is out of profile, the switch changes the DSCP value to 0. 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 Table 36-3 and Table 36-4. The policing is applied to those traffic matching the policy-map classification before the switch enables the trust boundary feature. • 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. If the packet does not have a DSCP value of 24, 26, or 46 or is out of profile, the switch changes the DSCP value to 0. The switch configures ingress and egress queues on the port according to the settings in Table 36-3 and Table 36-4. • When you enter the auto qos voip trust interface configuration command on a port connected to the interior of the network, the switch trusts the CoS value for nonrouted ports in ingress packets (the assumption is that traffic has already been classified by other edge devices). The switch configures the ingress and egress queues on the port according to the settings in Table 36-3 and Table 36-4. For information about the trusted boundary feature, see the "Configuring a Trusted Boundary to Ensure Port Security" section on page 36-35. 36-20 Cisco IE 3000 Switch Software Configuration Guide OL-13018-03