Draytek 2130 manual Port Rate Control, QoS Control List

	system will use the default speed for the specific limitation you
	set for each index.
RX Limit	Define the limitation for the speed of the downstream to be
	applied as specific limitation. If you do not set the limit in this
	field, the system will use the default speed for the specific
	limitation you set for each index.
Add	Add the specific speed limitation onto the list above.
Edit	Allows you to edit the settings for the selected limitation.
Delete	Remove the selected settings existing on the limitation list.

When you finish adding a new bandwidth limit, simply click OK. The following page will appear for you to check.

4.5.3 Port Rate Control

A policer can limit the bandwidth of received frames. It is located in front of the ingress queue. And a shaper can limit the bandwidth of transmitted frames. It is located after the ingress queues. This page allows you to configure the switch port rate limit for Policers and Shapers.

Port	Represent LAN or WAN interface.
Policer Enabled	Check this box to enable policer function.
Policer Rate(Rx)	Type the number for policer function. The default value is 500.
	It is restricted to 500-1000000 when the Policer Unit is set in
	kbps, and it is restricted to 1-1000 when the Policer Unit is set
	in Mbps.
Policer Unit	Determine the unit (kbps/Mbps) for policer.
Shaper Enabled	Check this box to enable shaper function.
Shaper Rate (Tx)	Type the number for shaper function. The default value is 500.
	It is restricted to 500-1000000 when the Shaper Unit is set in
	kbps, and it is restricted to 1-1000 when the Shaper Unit is set
	in Mbps.
Shaper Unit	Determine the unit (kbps/Mbps) for shaper function.

4.5.4 QoS Control List

Deploying QoS (Quality of Service) management to guarantee that all applications receive the service levels required and sufficient bandwidth to meet performance expectations is indeed one important aspect of modern enterprise network.

One reason for QoS is that numerous TCP-based applications tend to continually increase their transmission rate and consume all available bandwidth, which is called TCP slow start. If

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