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Set the quality of service mode and port rate
limits
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
802.1P/DSCP is the default QoS mode on the switch, but you can also set port-based
QoS.
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.
User Manual22Optimize the Switch
Performance
Gigabit Ethernet Plus Switches
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