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GE-DS-82 and NS2503-8P/2C Series User Manual
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
CFI
VLAN ID (VID)
User Priority
3 bits 1 bits 12 bits
TPID (Tag Protocol
TCI (Tag Control
Identifier)
Information)
2 bytes 2 bytes
Destination
Source
Ethernet
Preamble
Data
FCS
VLAN TAG
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.
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
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