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Cisco Systems IntelligentGigabit Ethernet Switch Modules for the IBMBladeCenter, Software Configuration Guide
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Chapter23 Co nfiguring QoS
Configuring Auto-QoS
Table23-3 lists the generated auto-QoS configuration for the egress queues.
When you enable the auto-QoS feature on the first interface, these automatic actions occur:
•When you enter the auto qos voip cisco-phone interface configuration command on a port at the
edge of a network that is connected to a Cisco IP Phone, the switc h 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 interface 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 egress queues on
the port according to the settings in Table 2 3-3.
•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 in ingress packets (the assumption is that
traffic has already been classified by other edge devices). The switch configures egress queues on
the port according to the settings in Table 2 3-3.
For information about the trusted boundary feature, see the “Configuring Trusted Boundary” section
on page 23-20.
When you enable auto-QoS by using the auto qos voip cisco-phone or the auto qos voip trust interface
configuration command, the switch automatically generates a QoS configuration based on the traffic
type and ingress packet label and applies the commands listed in Table23-4 to the interface.
Table23-3 Auto-QoS Configuration for the Egress Queues
Egress Queue Queue Number CoS-to-Queue Map Queue Weight
1% WRR 4 5 1 percent
70% WRR 3 3, 6, 7 70 percent
20% WRR 2 2, 4 20 percent
10% WRR 1 0,1 10 percent
Table23-4 Generated Auto-QoS Configuration
Description Automatically Generated QoS Command Equivalent
The switch automatically enables standard QoS and configures
the CoS-to-DSCP map (maps CoS values in incoming packets
to a DSCP value) as shown in Table23-2 on page 23-9.
Switch(config)# mls qos map cos-dscp 0 8 16 26 32 46
48 56
If you entered the auto qos voip trust command, the switch
automatically sets the ingress classification on the interface to
trust the CoS value in the packet.
Switch(config-if)# mls qos trust cos