802.1P Tag Priority Mode - Planet ISW-504PS User Manual

User's Manual
Figure 4-39 Quality of Service screen

4.6.1 802.1p Tag Priority Mode

QoS settings allow customization of packet priority in order to facilitate delivery of data traffic that might be affected by
latency problems. When 802.1p Tag Priority is applied, the Industrial PoE 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 Identifier) TCI (Tag Control 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 4-40 802.1p Tag Priority
The IEEE 802.1p Tag Priority specification uses 2 priority levels to classify data packets. The screen in Figure 4-41
appears.
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