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 and the preset performance
modes (gaming, media streaming, and standard) are port-based.
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 32.
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.
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.
User Manual
35
Optimize the Switch
Performance
Nighthawk S8000 Gaming & Streaming Advanced 8-Port Gigabit Ethernet Switch (GS808E)
