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GS108T Smart Switch Software Administration Manual
5-2 Configuring QoS and Security
v1.0, December 2007
• DSCP-based. The six most significant bits of the DiffServ field are called the Differentiated
Services Code Point (DSCP) bits. You can map the DSCP value to one of the eight priority
levels (p0 to P7) of IEEE 802.1p. Then, you can assign the IEEE 802.1p priority level to one
of the four internal hardware queues.
The switch empties the four hardware priority queues in order, beginning with the highest priority
queue to the lowest priority queue. Each hardware queue transmits all of the packets in its buffer
before permitting the next lower priority to transmit its packets.
To configure the QoS mode:
1. Select QoS > CoS > Basic > QoS Global Configuration. A screen similar to the following
displays.
2. Select the 802.1p Based or the DSCP Based radio button to determine the QoS mode.
3. Click Apply to confirm any settings changes.
Basic—Rate Limit
The Rate Limit screen, which is also referred to as the Rate Control Setting screen, lets you control
the bandwidth of ingress (incoming) and egress (outgoing) traffic for a specific port. To assign
bandwidth limits:
1. Select QoS > CoS > Basic > Rate Limit. A screen similar to the following displays.
Figure 5-1