Technical basics
4.6 VLAN tagging
SCALANCE XB-200 Web Based Management
Configuration Manual, 04/2015, C79000-G8976-C360-02
33
The device has multiple parallel queues in which the frames with different priorities can be
processed. First, the frames with the highest priority ("Strict Priority" method) are processed.
This method ensures that the frames with the highest priority are sent even if there is heavy
data traffic.
Canonical Format Identifier (CFI)
The CFI is required for compatibility between Ethernet and the token Ring.
The values have the following meaning:
0 The format of the MAC address is canonical. In the canonical representation of the MAC
address, the least significant bit is transferred first. Standard-setting for Ethernet switches.
1 The format of the MAC address is not canonical.
In the 12-bit data field, up to 4096 VLAN IDs can be formed. The following conventions
apply:
0 The frame contains only priority information (priority tagged frames) and no valid
1 - 4094 Valid VLAN identifier, the frame is assigned to a VLAN and can also include priori-
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