H3C S5820X Series Configuration Manual page 37

NOTE:
If a user profile is active, the QoS policy applied to it cannot be configured or removed, except ACLs
•
referenced in the QoS policy. However, when the users of the user profile are online, the referenced ACLs
cannot be modified either.
The QoS policies applied in user profile view support only the remark, car, and filter actions.
•
• Do not apply a null policy in user profile view, because you cannot activate a user profile with a null
policy applied.
Applying the QoS policy to a VLAN
You can apply a QoS policy to a VLAN to regulate traffic of the VLAN.
Follow these steps to apply the QoS policy to a VLAN:
To do...
Enter system view
Apply the QoS policy to VLANs
NOTE:
QoS policies cannot be applied to dynamic VLANs, for example, VLANs created by GVRP.
•
• Do not apply a QoS policy to a VLAN and the ports in the VLAN at the same time.
Applying the QoS policy globally
You can apply a QoS policy globally to the inbound or outbound direction of all ports.
Follow these steps to apply the QoS policy globally:
To do...
Enter system view
Apply the QoS policy globally
Applying the QoS policy to the control plane
A device provides the data plane and the control plane.
The data plane has, units responsible for receiving, transmitting, and switching (forwarding)
•
packets, such as various dedicated forwarding chips. They deliver super processing speeds and
throughput.
• The control plane has processing units running most routing and switching protocols and
responsible for protocol packet parsing and calculation, such as CPUs. Compared with data plane
units, they allow for great packet processing flexibility but have lower throughput.
When the data plane receives packets that it cannot recognize or process, it passes them to the control
plane. If the transmission rate exceeds the processing capability of the control plane, which may occur
at times of DoS attacks, the control plane will be busy handling undesired packets and fail to handle
legitimate packets correctly or timely.
To address this problem, apply a QoS policy to the control plane to take QoS actions such as traffic
filtering or rate limiting on inbound traffic, ensuring that the control plane can receive, transmit, and
process packets properly.
Use the command...
system-view
qos vlan-policy policy-name vlan
vlan-id-list { inbound | outbound }
Use the command...
system-view
qos apply policy policy-name
global { inbound | outbound }
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Remarks
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Required
Remarks
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Required