Applying The Qos Policy To A Vlan; Applying The Qos Policy Globally; Applying The Qos Policy To The Control Plane - HP 5920 Configuration Manual

Applying the QoS policy to a VLAN

You can apply a QoS policy to a VLAN to regulate traffic of the VLAN.
Configuration restrictions and guidelines
QoS policies cannot be applied to dynamic VLANs.
Configuration procedure
To apply the QoS policy to a VLAN:
Step
1. Enter system view.
2. Apply the QoS policy to
VLANs.

Applying the QoS policy globally

You can apply a QoS policy globally to the inbound or outbound direction of all ports.
To apply the QoS policy globally:
Step
1. Enter system view.
2. Apply the QoS policy
globally.

Applying the QoS policy to the control plane

A device provides the data plane and the control 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.
The units at the control plane are processing units running most routing and switching protocols and
•
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, which very likely
occurs at times of DoS attacks, 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
accounting or rate limiting, on inbound traffic. This makes sure the control plane can properly receive,
transmit, and process packets.
Configuration guidelines
• By default, the switch is configured with pre-defined control plane QoS policies, which take effect
on the control planes by default. A pre-defined control plane QoS policy uses the protocol type or
Command
system-view
qos vlan-policy policy-name vlan
vlan-id-list { inbound | outbound }
Command
system-view
qos apply policy policy-name global
{ inbound | outbound }
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Remarks
N/A
By default, no QoS policy is applied
to a VLAN.
Remarks
N/A
By default, no QoS policy is applied
globally.