Vlans; Notes About Vlans On The Dgs-3324Sr; Ieee 802.1Q Vlans - D-Link DGS-3324SR User Manual

D-Link DGS-3324SR Layer 3 Stackable Gigabit Ethernet Switch
Remember, the priority queue settings on the Switch are for all ports, and all devices connected to the Switch
will be affected. This priority queuing system will be especially beneficial if your network employs switches
with the capability of assigning priority tags.

VLANs

A Virtual Local Area Network (VLAN) is a network topology configured according to a logical scheme rather
than the physical layout. VLANs can be used to combine any collection of LAN segments into an autonomous
user group that appears as a single LAN. VLANs also logically segment the network into different broadcast
domains so that packets are forwarded only between ports within the VLAN. Typically, a VLAN corresponds to
a particular subnet, although not necessarily.
VLANs can enhance performance by conserving bandwidth, and improve security by limiting traffic to specific
domains.
A VLAN is a collection of end nodes grouped by logic instead of physical location. End nodes that frequently
communicate with each other are assigned to the same VLAN, regardless of where they are physically on the
network. Logically, a VLAN can be equated to a broadcast domain, because broadcast packets are forwarded to
only members of the VLAN on which the broadcast was initiated.

Notes About VLANs on the DGS-3324SR

No matter what basis is used to uniquely identify end nodes and assign these nodes VLAN membership, packets
cannot cross VLANs without a network device performing a routing function between the VLANs.
The DGS-3324SR supports IEEE 802.1Q VLANs and Port-Based VLANs. The port untagging function can be
used to remove the 802.1Q tag from packet headers to maintain compatibility with devices that are tag-unaware.
The Switch's default is to assign all ports to a single 802.1Q VLAN named "default."
The "default" VLAN has a VID = 1.
The member ports of Port-based VLANs may overlap, if desired.

IEEE 802.1Q VLANs

Some relevant terms:
Tagging – The act of putting 802.1Q VLAN information into the header of a packet.
Untagging – The act of stripping 802.1Q VLAN information out of the packet header.
Ingress port – A port on a switch where packets are flowing into the switch and VLAN decisions must be made.
Egress port – A port on a switch where packets are flowing out of the switch, either to another switch or to an
end station, and tagging decisions must be made.
IEEE 802.1Q (tagged) VLANs are implemented on the Switch. 802.1Q VLANs require tagging, which enables
them to span the entire network (assuming all switches on the network are IEEE 802.1Q-compliant).
VLANs allow a network to be segmented in order to reduce the size of broadcast domains. All packets entering a
VLAN will only be forwarded to the stations (over IEEE 802.1Q enabled switches) that are members of that
VLAN, and this includes broadcast, multicast and unicast packets from unknown sources.
VLANs can also provide a level of security to your network. IEEE 802.1Q VLANs will only deliver packets
between stations that are members of the VLAN.
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