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5-4-7. VLAN Configuration
A Virtual LAN (VLAN) is a logical network grouping that limits the broadcast
domain. It allows you to isolate network traffic so only members of the VLAN
receive traffic from the same VLAN members. Basically, creating a VLAN from
a switch is logically equivalent of reconnecting a group of network devices to
another Layer 2 switch. However, all the network devices are still plugged into
the same switch physically.
The MIL-SM808G switch supports port-based and protocol-based VLANs. In
the default configuration, VLAN support is enabled and all ports on the switch
belong to the default VLAN. VID is 1.
NOTE: The default VLAN can’t be deleted.
Support Port-based VLANs (IEEE 802.1Q VLAN)
The IEEE 802.1Q specification is the standard for Port-based Tagging.
Therefore, it is possible to create a VLAN across devices from different switch
suppliers. IEEE 802.1Q VLAN uses a technique to insert a “tag” into the
Ethernet frames. The tag contains a VLAN Identifier (VID) that indicates the
VLAN numbers.
Support Protocol-based VLAN
In order for an end station to send packets to different VLANs, it has to be
either capable of tagging the packets it sends with VLAN tags OR be attached
to a VLAN-aware bridge. The VLAN-aware bridge must be capable of
classifying and tagging the packet with different VLAN ID. The classification
and tagging of the packets is based on default PVID and other information
about the packet, such as the protocol.