Manually Set The Quality Of Service Mode And Port Rate Limits; Use Port-Based Quality Of Service And Set Port Priorities - NETGEAR GS908E User Manual

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
Settings as a Custom Preset Mode
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.
on page 28.
Optimize the Switch Performance
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Save Your Quality of Service