SignaMax 065-7931 User's Guide Page 50

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Signamax 065-7931 16-Port 10/100/1000BaseT/TX WebSmart Switch
42
VLAN-tagged frame:
An Ethernet frame, carrying a VLAN tag field, containing VLAN identification
without the values of 0 and 4095, and priority information.
Priority-tagged frame:
An Ethernet frame, carrying a VLAN tag field, containing VLAN identification
with the value of 0, and priority information.
Untagged frame:
An Ethernet frame carrying no VLAN tag information.
VLAN Identifier:
Also referred to as VID. It is used to identify a member belonging to the
VLAN group with the VID. The assignable number is 1- 4094. If VID=0, the tagged
frame is a priority packet. Neither of the values of 0 and 4095 can be assigned in
VLAN management.
Port VLAN Identifier:
VLAN identifier of a port. It also can be referred to as PVID. When an
untagged frame or a priority-tagged frame is received, the frame will be inserted the
PVID of that port in the VLAN tag field. The frame with VID assigned by a port is
called PVID. Each port can only be assigned a PVID. The default value for PVID is
1, the same as VID.
Ingress filtering:
The process used to check a received packet and compare its VID to the
VLAN membership of the ingress port. The ingress filtering can be set by per port.
When receiving a packet, a VLAN bridge examines if the VID in the frame’s header
has been presented.
If the VID of the received packet is presented, the VID of the packet is used.
And the VLAN bridge will check its MAC address table to see if the destination ports
are members of the same VLAN. If both are members of the tagged VLAN, then the
packet will be forwarded.
If the packet is an untagged or a null tag packet, the ingress port’s PVID is
applied to the packet. The VLAN bridge will then look up the MAC address table
and determine to which ports the packet should be forwarded. Next, it will check to
see if the destination ports belong to the same VLAN with that PVID. If the
destination ports are members of the VLAN used by the ingress port, the packet will
be forwarded.
Note: VID can not be 0 or 4095.
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