Interlogix GE-DS-242-PoE - Manual (Page 59)

Chapter 4: Console Management
GE-DS-242-PoE Managed Ethernet Switch User Manual 55
VLAN Configuration
VLAN Overview
A Virtual Local Area Network (VLAN) is a network topology configured according
to a logical scheme rather than the physical layout. VLAN can be used to
combine any collection of LAN segments into an autonomous user group that
appears as a single LAN. VLAN 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.
VLAN 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.
NOTE:
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 Managed Switch supports 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.
The Managed Switch supports IEEE 802.1Q (tagged-based) and Port-Base
VLAN setting in web management page. In the default configuration, VLAN
support is "802.1Q".
Port-based VLAN
Port-based VLAN limit traffic that flows into and out of switch ports. Thus, all
devices connected to a port are members of the VLAN(s) the port belongs to,
whether there is a single computer directly connected to a switch, or an entire
department.
On port-based VLAN.NIC do not need to be able to identify 802.1Q tags in
packet headers. NIC send and receive normal Ethernet packets. If the packet's