PLANET ISW-504PS - Manual (Page 49)

User’s Manual
A switch port can have only one PVID, but can have as many VID as the switch has memory in its VLAN table to store
them.
Because some devices on a network may be tag-unaware, a decision must be made at each port on a tag-aware device
before packets are transmitted – should the packet to be transmitted have a tag or not? If the transmitting port is connected
to a tag-unaware device, the packet should be untagged. If the transmitting port is connected to a tag-aware device, the
packet should be tagged.
Default VLAN
The Switch initially configures one VLAN, VID = 1, called "default." The factory default setting assigns all ports on the
Switch to the "default". As new VLAN are configured in Port-based mode, their respective member ports are removed
from the "default."
The Switch supports SVL (Shared VLAN Learning), all VLAN groups share the same Layer
2 learned MAC address table.
1 No matter what basis is used to uniquely identify end nodes and assign these nodes
VLAN membership, packets cannot cross VLAN without a network device performing a
routing function between the VLAN.
2 The Switch supports Port-based VLAN and IEEE 802.1Q VLAN. The port untagging
function can be used to remove the 802.1 tag from packet headers to maintain
compatibility with devices that are tag-unaware.
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