DGS-3024 Gigabit Ethernet Switch Manual
ingress port. If it does not, the packet is dropped. If it has the same VID, the packet is forwarded and the destination port transmits
it on its attached network segment.
This process is referred to as ingress filtering and is used to conserve bandwidth within the Switch by dropping packets that are
not on the same VLAN as the ingress port at the point of reception. This eliminates the subsequent processing of packets that will
just be dropped by the destination port.
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."
Packets cannot cross VLANs. If a member of one VLAN wants to connect to another VLAN, the link must be through an external
router.
NOTE
: If no VLANs are configured on the Switch, then all packets will be
forwarded to any destination port. Packets with unknown source
addresses will be flooded to all ports. Broadcast and multicast packets will
also be flooded to all ports.
An example is presented below:
VLAN Name
VID
Switch Ports
System (default)
1
5, 6, 7, 8, 21, 22, 23, 24
Engineering
2
9, 10, 11, 12
Marketing
3
13, 14, 15, 16
Finance
4
17, 18, 19, 20
Sales
5
1, 2, 3, 4
Table 7- 2. VLAN Example - Assigned Ports
VLAN and Trunk Groups
The members of a trunk group have the same VLAN setting. Any VLAN setting on the members of a trunk group will apply to
the other member ports.
NOTE
: In order to use VLAN segmentation in conjunction with port trunk groups, first
set the port trunk group(s), and then configure VLAN settings. To change the port
trunk grouping with VLANs already in place, users will not need to reconfigure the
VLAN settings after changing the port trunk group settings. VLAN settings will
automatically change in conjunction with the change of the port trunk group settings.
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