B&B Electronics 858-18121 - Manual - Manual (Page 21)

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When configuring a trunk port, an Ethertype can be user-defined (a trunk port is also
defined as a provider port based on 802.1ad). If an Ethertype value comes in a trunk
port and is different than the user-defined Ethertype, it will be treated as an
unrecognized VLAN tagged frame. If configuring the port as an access port, enter a
VLAN ID between 1 and 4,094. Possible priority settings are 0 (lowest priority)
through 7 (highest priority).
NOTE
When an Ethertype or VLAN ID is assigned, the same values need to be configured at the end
device (router, etc) to avoid network configuration problems.
Operational Mode Configuration
There are two modes of operation that can be configured through the Serial/Telnet
session: Mode 1, which supports a mixture of tagged and untagged traffic, and Mode
2 Extra tagging.
The configuration screen is accessed by typing vlan and pressing Enter from the
Additional Commands screen. The system displays the current operation mode
screen. Press the Space Bar to select the other mode.