Manually Set the Quality of Service Mode and Port Rate Limits. Netgear GS908E

8-Port Gigabit Ethernet Smart Managed Plus Switch Model GS908E

Manually Set the Quality of Service Mode and Port Rate

Limits

Instead of using preset performance modes, you can manually set the Quality of Service (QoS) modes to manage traffic:

•

Port-based QoS mode. Lets you set the priority (low, medium, high, or critical) for individual port numbers and lets you set rate limits for incoming and outgoing traffic for individual ports. If broadcast filtering is enabled, you can also set the storm control rate for incoming traffic for individual ports.

•

802.1P/DSCP QoS mode. Applies pass-through prioritization that is based on tagged packets and lets you set rate limits for incoming and outgoing traffic for individual ports. If broadcast filtering is enabled, you can also set the storm control rate for incoming traffic for individual ports.

This QoS mode applies only to devices that support 802.1P and Differentiated Services Code Point

(DSCP) tagging. For devices that do not support 802.1P and DSCP tagging, ports are not prioritized but the configured rate limit is still applied.

You can limit the rate of incoming traffic, outgoing traffic, or both on a port to prevent the port (and the device that is attached to it) from taking up too much bandwidth on the switch. Rate limiting, which you can set for individual ports in either QoS mode, simply means that the switch slows down all traffic on a port so that traffic does not exceed the limit that you set for that port. If you set the rate limit on a port too low, you might, for example, see degraded video stream quality, sluggish response times during online activity, and other problems.

Use Port-Based Quality of Service and Set Port Priorities

Port-based priority is the default QoS mode on the switch.

Note

If the QoS mode on the switch is 802.1P/DSCP, we recommend that you first save your current QoS settings as a custom preset mode before you change the QoS mode

to the Port-based mode. For more information, see

Save Your Quality of Service

Settings as a Custom Preset Mode

on page 28.

For each port, you can set the priority and the rate limits for both incoming and outgoing traffic:

•

Port priority. The switch services traffic from ports with a critical priority before traffic from ports with a high, medium, or low priority. Similarly, the switch services traffic from ports with a high priority before traffic from ports with a medium or low priority. If severe network congestion occurs, the switch might drop packets with a low priority.

•

Port rate limits. The switch accepts traffic on a port at the rate (the speed of the data transfer) that you set for incoming traffic on that port. The switch transmits traffic from a port at the rate that you set for outgoing traffic on that port. You can select each rate limit as a predefined data transfer threshold from

512 Kbps to 512 Mbps.

Note

If you set a port rate limit, the actual rate might fluctuate, depending on the type of traffic that the port is processing.

Optimize the Switch Performance

24

8-Port Gigabit Ethernet Smart Managed Plus Switch Model GS908E

To use the Port-based QoS mode and set the priority and rate limits for ports:

1.

Open a web browser from a computer that is connected to the same network as the switch or to the switch directly through an Ethernet cable.

2.

Enter the IP address that is assigned to the switch.

The login page displays.

3.

Enter the switch password.

The default password is password. The password is case-sensitive.

The HOME page displays.

4.

From the menu at the top of the page, select SWITCHING.

The Quality of Service (QoS) page displays.

5.

If the selection from the QoS Mode menu is 802.1P/DSCP, do the following to change the selection to

Port-based:

a.

From the QoS Mode menu, select Port-based.

A pop-up warning window opens.

b.

Click the CONTINUE button.

The pop-up window closes.

Note

For information about broadcast filtering, see

Manage Broadcast Filtering and Set

Port Storm Control Rate Limits

on page 27.

6.

To set the port priorities, do the following:

a.

Click the PRIORITY tab.

b.

Click the EDIT button.

The EDIT PRIORITY page displays.

c.

For each port for which you want to set the priority, select Low, Medium, High, or Critical from the individual menu for the port.

The default selection is High.

d.

Click the APPLY button.

Your settings are saved and the EDIT PRIORITY page closes.

7.

To set rate limits, do the following:

a.

Click the RATE LIMITS tab.

b.

Click the EDIT button.

The EDIT RATE LIMITS page displays.

c.

For each port for which you want to set rate limits, select the rate in Kbps or Mbps from the individual

In Limits and Out Limits menus for the port.

The default selection is No Limit.

d.

Click the APPLY button.

Your settings are saved and the EDIT RATE LIMITS page closes.

Optimize the Switch Performance

25

8-Port Gigabit Ethernet Smart Managed Plus Switch Model GS908E

Use 802.1P/DSCP Quality of Service

In the 802.1P/DSCP QoS mode, the switch uses the 802.1P or DSCP information in the header of an incoming packet to prioritize the packet. With this type of QoS, you cannot control the port prioritization on the switch because the device that sends the traffic (that is, the packets) to the switch prioritizes the traffic.

However, you can set the rate limits for individual ports on the switch.

The switch accepts traffic on a port at the rate (the speed of the data transfer) that you set for incoming traffic on that port. The switch transmits traffic from a port at the rate that you set for outgoing traffic on that port. You can select each rate limit as a predefined data transfer threshold from 512 Kbps to 512 Mbps.

Note

If the QoS mode on the switch is Port-based, we recommend that you first save your current QoS settings as a custom preset mode before you change the QoS mode to

the 802.1P/DSCP QoS mode. For more information, see

Save Your Quality of Service

Settings as a Custom Preset Mode

on page 28.

To use 802.1P/DSCP QoS mode and set the rate limits for ports:

1.

Open a web browser from a computer that is connected to the same network as the switch or to the switch directly through an Ethernet cable.

2.

Enter the IP address that is assigned to the switch.

The login page displays.

3.

Enter the switch password.

The default password is password. The password is case-sensitive.

The HOME page displays.

4.

From the menu at the top of the page, select SWITCHING.

The Quality of Service (QoS) page displays.

5.

If the selection from the QoS Mode menu is Port-based, do the following to change the selection to

802.1P/DSCP:

a.

From the QoS Mode menu, select 802.1P/DSCP.

A pop-up warning window opens.

b.

Click the CONTINUE button.

The pop-up window closes.

Note

For information about broadcast filtering, see

Manage Broadcast Filtering and Set

Port Storm Control Rate Limits

on page 27.

6.

To set rate limits, do the following:

a.

Click the RATE LIMITS tab.

If broadcast filtering is disabled, only the RATE LIMITS tab displays.

b.

Click the EDIT button.

The EDIT RATE LIMITS page displays.

Optimize the Switch Performance

26