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User’s Manual of FGSW-2620VM / FGSW-2620PVM
101
4.9.2 QoS Configuration
QoS settings allow customization of packet priority in order to facilitate delivery of data traffic that might be affected by
latency problems. When CoS / 802.1p Tag Priority is applied, the Switch recognizes 802.1Q VLAN tag packets and extracts
the VLAN tagged packets with User Priority value.
802.1Q Tag and 802.1p priority
User Priority CFI VLAN ID (VID)
3 bits 1 bits 12 bits
TPID (Tag Protocol
Identifier)
TCI (Tag Control
Information)
2 bytes 2 bytes
Preamble
Destination
Address
Source
Address
VLAN TAG
Ethernet
Type
Data FCS
6 bytes 6 bytes 4 bytes 2 bytes 46-1517 bytes 4 bytes
Figure 4-9-1: 802.1p Tag Priority
Set up the COS priority level. With the drop-down selection item of Priority Type above being selected as COS only/COS
first, this control item will then be available to set the queuing policy for each port.
4.9.2.1 Priority Queue Service settings
QoS settings allow customization of packet priority in order to facilitate delivery of data traffic that might be affected by
latency problems. The IEEE 802.1p Priority specification uses 8 priority levels to classify data packets. In 802.1p compliant
devices, a tag inserted into the packet header is used to identify the priority level of data packets.
The Switch supports Static Port Ingress priority and four queues. The screen in Figure 4-9-2 appears.
Figure 4-9-2: QoS Configuration – 802.1Priority