HP 5900 Configuration Guide

21
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:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Apply the QoS policy to
VLANs.
qos vlan-policy policy-name vlan
vlan-id-list { inbound | outbound }
By default, no QoS policy is applied
to a VLAN.
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:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Apply the QoS policy
globally.
qos apply policy policy-name global
{ inbound | outbound }
By default, no QoS policy is applied
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

HP 5900 Specifications

General

Model	HP 5900
Rack Mountable	Yes
MAC Address Table Size	128K
Jumbo Frame Support	Yes
Routing Protocol	OSPF, BGP, RIP, IS-IS, IGMP
Remote Management Protocol	SNMP, CLI
Features	Quality of Service (QoS), Jumbo Frames support, IPv4 support, IPv6 support
Operating Temperature	0 °C to 45 °C
Operating Humidity	10% to 90% non-condensing
Power Supply	Internal power supply - hot-plug / redundant