Cisco Catalyst 3560X-24P Command Reference Manual page 95

Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands
The switch applies the auto-QoS-generated commands as if the commands were entered from the
Note
command-line interface (CLI). An existing user configuration can cause the application of the generated
commands to fail or to be overridden by the generated commands. These actions occur without warning.
If all the generated commands are successfully applied, any user-entered configuration that was not
overridden remains in the running configuration. Any user-entered configuration that was overridden can
be retrieved by reloading the switch without saving the current configuration to memory. If the generated
commands fail to be applied, the previous running configuration is restored.
If this is the first port on which you have enabled auto-QoS, the auto-QoS-generated global configuration
commands are executed followed by the interface configuration commands. If you enable auto-QoS on
another port, only the auto-QoS-generated interface configuration commands for that port are executed.
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 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
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 decide 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
When you enter the auto qos voip trust interface configuration command on a port connected to the
•
network interior, the switch trusts the CoS value for nonrouted ports or the DSCP value for routed
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
You can enable auto-QoS on static, dynamic-access, and voice VLAN access, and trunk ports. When
enabling auto-QoS with a Cisco IP Phone on a routed port, you must assign a static IP address to the IP
phone.
When a device running Cisco SoftPhone is connected to a switch or routed port, the switch supports only
Note
one Cisco SoftPhone application per port.
After auto-QoS is enabled, do not modify a policy map or aggregate policer that includes AutoQoS in its
name. If you need to modify the policy map or aggregate policer, make a copy of it, and change the
copied policy map or policer. To use the new policy map instead of the generated one, remove the
generated policy map from the interface, and apply the new policy map.
OL-21522-02
2-11. The policing is applied to those traffic matching the policy-map classification before the
Table 2-10 and Table
Table 2-10 and Table 2-11.
2-11.
Catalyst 3750-X and 3560-X Switch Command Reference
auto qos voip
Table 2-10 and
2-63