3Com 4210G Series Configuration Manual page 440

You cannot modify the classification rules, traffic behaviors, and classifier-behavior associations in
a QoS policy already applied. To check whether a QoS policy has been applied successfully, use
the display qos policy global command and the display qos policy interface command.
The switch may save the applications of some QoS policies that have failed to be applied due to
insufficient hardware resources in the configuration file. After the switch reboots, these policies
may preempt other user configurations for resources, resulting in loss of configurations. Suppose
that the user-bind command is configured on GigabitEthernet 1/0/2, and the application of a QoS
policy to GigabitEthernet 1/0/1 is saved in the configuration file even though the application has
failed due to insufficient resources. After the switch reboots, it may assign resources to have the
QoS policy take effect preferentially, while the user-bind configuration may be lost due to
insufficient resources.
Applying the QoS policy to an interface
A policy can be applied to multiple ports. Only one policy can be applied in inbound direction of a
port/port group.
Follow these steps to apply the QoS policy to an interface:
To do...
Enter system view
Enter
interface
Enter
view
interface
view or port
Enter port
group view
group view
Apply the policy to the
interface/port group
Applying the QoS policy to online users
You can apply a QoS policy to multiple online users, but in one direction of each online user only one
policy can be applied. To modify a QoS policy already applied in a certain direction, remove the QoS
policy application first.
Follow these steps to apply the QoS policy to online users:
To do...
Enter system view
Use the command...
system-view
interface interface-type
interface-number
port-group manual
port-group-name
qos apply policy policy-name
inbound
Use the command...
system-view
Remarks
—
Use either command
Settings in interface view take
effect on the current interface;
settings in port group view take
effect on all ports in the port
group.
Required
Remarks
—