Applying The Qos Policy To The Control Plane - HP MSR4080 Configuration Manual

3. Apply the QoS policy to
the interface or PVC.

Applying the QoS policy to the control plane

A device provides the data plane and the control plane:
Data plane—The units at the data plane are responsible for receiving, transmitting, and switching
•
(forwarding) packets, such as various dedicated forwarding chips. They deliver super processing
speeds and throughput.
Control plane—The units at the control plane are processing units running most routing and
•
switching protocols. They are responsible for protocol packet resolution and calculation, such as
CPUs. 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 makes sure the control plane can correctly receive,
transmit, and process packets.
The router is enabled with predefined control plane QoS policies 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 reference 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.
If the hardware resources of an interface card are insufficient, applying a QoS policy to the control plane
might fail on the interface card. The system does not automatically roll back the QoS policy already
applied to the MPU or other interface cards. To ensure consistency, you must use the undo qos apply
policy command to manually remove the QoS policy configuration applied to them.
Configuration procedure
To apply the QoS policy to the control plane:
Step
1. Enter system view.
2. Enter control plane view.
3. Apply the QoS policy to
the control plane.
qos apply policy policy-name { inbound |
outbound }
Command
system-view
•
MSR1000/MSR2000/MSR3000:
control-plane
•
MSR4000:
control-plane slot slot-number
qos apply policy policy-name inbound
24
By default, no QoS policy is
applied to an interface or
PVC.
Remarks
N/A
N/A
By default, no QoS policy is
applied to a control plane.