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User’s Manual of FGSW-2620VM / FGSW-2620PVM
150
6.10 Quality of Service
There are four transmission queues with different priorities in the Managed Switch: Highest, SecHigh, SecLow and
Lowest. The Managed Switch will take packets from the four queues according to its QoS mode setting. If the QoS mode
was set to “Disable”, the Managed Switch will not perform QoS on its switched network. If the QoS mode was set to “High
Empty Then Low”, the Managed 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 Managed 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 the Managed
Switch, it 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 Managed
Switch 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.
6.10.1 QoS Configuration
QoS mode:
First Come First Service: The sequence of packets sent is depending on arrive orders.
All High before Low: The high priority packets sent before low priority packets.
WRR: Weighted Round Robin. Select the preference given to packets in the switch's high-priority queue. These options
represent the number of higher priority packets sent before one lower priority packet is sent. For example, 8 Highest：4
second-high means that the switch sends 8 highest-priority packets before sending 4 second-high priority packets.
Qos level: 0~7 priority level can map to highest, second-high, second-low, lowest queue.
Commands:
qos priority
Description:
Set 802.1p priority.
Syntax:
qos priority <first-come-first-service | all-high-before-low |weighted-round-robin>
Parameters: