VS-2400S 24 Ports VDSL2 Managed IP DSLAM with POTS splitter USER
’S MANUAL Ver.A3
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4.0.3.5 Quality of Service
There are four transmission queues with different priorities in VS-2400S: Highest, SecHigh, SecLow and Lowest. The switch will take
packets from the four queues according to its QoS mode setting. If the QoS mode was set to “Disable”, the switch will not
perform
QoS on its switched network. If the QoS mode was set to “High Empty Then Low”, the switch will never exhaust packets
from a queue until the queues with higher priorities are empty. If the QoS mode was set to “weight ratio”, the switch will exhaust
packets
from the queues according to the ratio. The default value of QoS mode is “weight 8:4:2:1.” That means the switch will
first exhaust 8 packets from the queue with highest priority, and then exhaust 4 packets from the queue with second high priority,
and so on.
When the switch received a packet, the switch has to decide which queue to put the received packet into. In VS-2400S, the switch
will put received packets into queues according to the settings of “802.1p Priority” and “Static Port Ingress Priority.” When the
received packet is an 802.1p tagged packet, the switch will put the packet into a queue according to the 802.1p Priority setting.
Otherwise, the switch will put the packet into a queue according the setting of Static Port Ingress Priority.
802.1p Priority:
the 802.1p packet has a priority tag in its packet header. The range of the priority is 7~0. The VS-2400S can
specify the mapping between 802.1p priority and the four transmission queues. In the default setting, the packets with 802.1p
priority 0~1 are put into the queue with lowest priority, the packets with 802.1p priority 2~3 are put into queue with second low
priority, and so on.
Static Port Ingress Priority:
each port is assigned with one priority 7~0. The priority of the packet received from one port is set
to the same priority of the receiving port. When the priority of the received packet was determined, the packet is treated as an
802.1p packet with that priority and will be put into a queue according to the 802.1p Priority setting.
