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DGS-3100 Series Gigabit Stackable Managed Switch User Manual
60
the 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 is just 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.’
Ports can’t be removed from the default VLAN, If a port is configured as Untagged member to other VLAN it will be
authomatically removed from the default VLAN.
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 are forwarded to any
destination port. Packets with unknown source addresses are flooded to all ports. Broadcast and
multicast packets are also flooded to all ports.
An example is presented in this table:
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 3-1. VLAN Example - Assigned Ports
VLAN and Trunk Groups
Trunk Groups (LAGs) can be added as member to a VLAN (similar to ports).
The members of a trunk group have the same VLAN setting. Any VLAN setting on trunk group members applies to the
other member ports.
NOTE: In order to use VLAN segmentation in conjunction with port trunk groups, the port trunk
group(s) can first be set, and then the VLAN settings may be configured. Changing the port trunk
grouping with VLANs already in place doesn’t require reconfiguration of the VLAN settings after
changing the port trunk group settings. VLAN settings automatically change in conjunction with the
change of the port trunk group settings.
VLAN Status
The VLAN List displays VLANs, VLAN membership and membershiop type. This window displays the ports on the switch
that are currently Egress or Tag ports. To view the following table, open the L2 features->VLAN folder and click the VLAN
Status Link.
This section contains the following topics:
•
Defining VLAN Properties
•
Configuring GVRP