Interlogix GE-DSSG-244-POE User Manual - Manual (Page 96)

IFS NS3601-24P/4S GE-DSSG-244 and 244-POE User Manual
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Port VLAN ID
Packets that are tagged (are carrying the 802.1Q VID information) can be transmitted from one 802.1Q compliant network device to
another with the VLAN information intact. This allows 802.1Q VLAN to span network devices (and indeed, the entire network – if all
network devices are 802.1Q compliant).
Every physical port on a switch has a PVID. 802.1Q ports are also assigned a PVID, for use within the switch. If no VLAN are
defined on the switch, all ports are then assigned to a default VLAN with a PVID equal to 1. Untagged packets are assigned the
PVID of the port on which they were received. Forwarding decisions are based upon this PVID, in so far as VLAN are concerned.
Tagged packets are forwarded according to the VID contained within the tag. Tagged packets are also assigned a PVID, but the
PVID is not used to make packet forwarding decisions, the VID is.
Tag-aware switches must keep a table to relate PVID within the switch to VID on the network. The switch will compare the VID of a
packet to be transmitted to the VID of the port that is to transmit the packet. If the two VID are different the switch will drop the packet.
Because of the existence of the PVID for untagged packets and the VID for tagged packets, tag-aware and tag-unaware network
devices can coexist on the same network.
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 VLANs
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."
■ Assigning Ports to VLANs
Before enabling VLANs for the switch, you must first assign each port to the VLAN group(s) in which it will participate. By default all
ports are assigned to VLAN 1 as untagged ports. Add a port as a tagged port if you want it to carry traffic for one or more VLANs,
and any intermediate network devices or the host at the other end of the connection supports VLANs. Then assign ports on the other
VLAN-aware network devices along the path that will carry this traffic to the same VLAN(s), either manually or dynamically using
GVRP. However, if you want a port on this switch to participate in one or more VLANs, but none of the intermediate network devices
nor the host at the other end of the connection supports VLANs, then you should add this port to the VLAN as an untagged port.
VLAN-tagged frames can pass through VLAN-aware or VLAN-unaware network interconnection
devices, but the VLAN tags should be stripped off before passing it on to any end-node host that
does not support VLAN tagging.
■ VLAN Classification
When the switch receives a frame, it classifies the frame in one of two ways. If the frame is untagged, the switch assigns the frame
to an associated VLAN (based on the default VLAN ID of the receiving port). But if the frame is tagged, the switch uses the tagged
VLAN ID to identify the port broadcast domain of the frame.
■ Port Overlapping
Port overlapping can be used to allow access to commonly shared network resources among different VLAN groups, such as file
servers or printers. Note that if you implement VLANs which do not overlap, but still need to communicate, you can connect them by
enabled routing on this switch.
■ Untagged VLANs
Untagged (or static) VLANs are typically used to reduce broadcast traffic and to increase security. A group of network users
assigned to a VLAN form a broadcast domain that is separate from other VLANs configured on the switch. Packets are forwarded
only between ports that are designated for the same VLAN. Untagged VLANs can be used to manually isolate user groups or
subnets.
VLAN Basic Information
The VLAN Basic Information page displays basic information on the VLAN type supported by the Managed Switch.
The VLAN Basic Information screen is shown
Figure 4-6-1 .