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• Data plane—The units (such as various dedicated forwarding chips) at the data plane are
responsible for receiving, transmitting, and switching (forwarding) packets. They deliver super
processing speeds and throughput.
• Control plane—The units (such as CPUs) at the control plane are processing units running
most routing and switching protocols. They are responsible for protocol packet resolution and
calculation. Compared with data plane units, the control plane units allow for great packet
processing flexibility but have lower throughput.
When the data plane receives packets that it cannot recognize or process, it transmits them to the
control plane. If the transmission rate exceeds the processing capability of the control plane, the
control plane will be busy handling undesired packets and fail to handle legitimate packets correctly
or timely. As a result, protocol performance is affected.
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. This ensures that the control plane can correctly receive,
transmit, and process packets.
By default, the switch is configured with predefined control plane QoS policies, which take effect on
the control planes by default. A predefined control plane QoS policy uses the protocol type or
protocol group type to identify the type of packets sent to the control plane. You can use protocol
types or protocol group types in if-match commands in traffic class view for traffic classification.
Then you can reconfigure traffic behaviors for these traffic classes as required. You can use the
display qos policy control-plane pre-defined command to display predefined control plane QoS
policies.
Configuration guidelines
If a QoS policy applied to the control plane uses if-match control-plane protocol-group or
if-match control-plane protocol for traffic classification in a class, the action in the associated
traffic behavior can only be car or the combination of car and accounting packet, and only the cir
keyword in the car action can be applied normally.
Configuration procedure
To apply the QoS policy to a control plane:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter control plane
view.
control-plane
slot
slot-number
N/A
3. Apply the QoS policy to
the control plane.
qos apply policy
policy-name
inbound
By default, no QoS policy
is applied to a control
plane.
Applying the QoS policy to a user profile
You can apply a QoS policy to multiple user profiles. In one direction of each user profile, only one
policy can be applied. To modify a QoS policy already applied to a user profile, first remove the
applied QoS policy.
When you apply a QoS policy to a user profile, follow these restrictions and guidelines:
• The QoS policy supports only the car and accounting actions in its behaviors.
• The QoS policy cannot be empty, because a user profile configured with an empty QoS policy
cannot be activated.
• The switch supports two authentication methods (802.1X and MAC) for online users.
To apply a QoS policy to a user profile:
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