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RuggedSwitch™ User Guide
Edge Type
An edge port is always a member of only one VLAN, the native VLAN (often
called the port VLAN or PVID).
Use an edge port with PVID Format set to “tagged” when you need to service
VLAN aware equipments and with PVID Format set to “untagged” when you
need to service non-VLAN aware equipments.
Untagged frames received on edge ports will be forwarded to the network using
the port's configured native VLAN.
Tagged frames received on edge ports will be forwarded to the network only if the
tag is the same as the configured native VLAN (otherwise the frame will be
discarded).
Frames transmitted out the port will be tagged with the native VLAN or sent
untagged depending upon the PVID format parameter (see “PVID Format”
below).
Trunk Type
Trunk ports are automatically members of all VLANs and implement switch-to-
switch connections.
The switch can “pass through” traffic, forwarding frames received on one trunk
port out another trunk port. The trunk ports must be members of all the VLANs
the “pass through” traffic is part of, even if none of those VLANs are used on
edge ports.
Untagged frames received on trunk ports will be forwarded using the port's native
VLAN.
Frames transmitted out the port on the native VLAN will be tagged or untagged
depending upon the PVID format (see below). Frames on other VLANs are
always sent tagged.
Note:
Sometimes it may be desirable to manually restrict the traffic on the trunk to a certain
group of VLANs, for example when: the trunk connects to a device (such as a layer 3 router)
that supports a subset of the available VLANs.
Traffic may be manually restricted on trunk ports through the “Forbidden Ports” parameter
(See “Static VLANs Menu” above).
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