User’s Manual of FGSW-2620VM / FGSW-2620PVM

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

 

 

 

 

 

TCI (Tag Control

 

 

 

 

 

 

 

 

Identifier)

 

 

 

 

 

Information)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 bytes

 

 

2 bytes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Preamble

Destination

 

Source

 

VLAN TAG

 

 

Ethernet

 

Data

 

FCS

Address

 

Address

 

 

 

Type

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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 4-9-2appears.

Figure 4-9-2:QoS Configuration – 802.1Priority

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