4.7.7 QoS Setup

The system support 2 level priority queues. The queue service rate is based on the packet-based Weighted Round Robin algorithm. The ratio can be set as 4:1, 8:1, 16:1, or strictly high priority first.

The port-based priority is to decide the packet priority by the receiving ports. You can select the high priority ports from the switch graphic.

If TOS/DSCP based priority is enabled, it will be assigned to high priority queue if the field value is:

expected forwarding: 0b101110;

assured forwarding: 0b001010, 0b010010, 0b011010, 0b100010

network control: 0b11x000

If 802.1p based priority is enabled, the packet forward priority is decided by the CoS value. The high priority packets have the CoS value from 4 to 7.

In some situations, you may want the high priority packets to get forwarded even the 802.3x flow control stop transmitting packets. In this case, enable Adapted Flow Control will turn off 802.3x flow control for a short time to let the high priority packets get forwarded. The 802.3x is re-enable when no high priority frames are received for 1 to 2 seconds. See figures below.

Figure 4.24 QoS Setup (GigaX 1024P)

GigaX Smart Switch Centralized Network Management

39