User`s guide

HTML SET UP & DIAGNOSTIC
14 VLAN set up
14.1 Overview
VLAN is a flexible group of devices that can be located anywhere in a
network, but that can communicate as if they are on the same physical
segment.
Devices within a VLAN can only communicate directly with devices
belonging to the same VLAN. If a device belonging to VLAN 1 needs to
communicate with devices in VLAN 2, the traffic needs to pass through a
routing device or Layer 3 switch.
An Ethernet frame belonging to a particular VLAN is tagged with a code
which is the VLAN identity code.
Four VLANs are managed by each
XSRING.
Each Ethernet port of an XSRING
can be assigned to one of that four
VLANs.
The HTML administration server
and the serial gateway can also be
assigned to one of that four VLANs.
Each RJ45 port can be set up as “Untag” or “Tag” or “Trunk” or “All
access”.
“Untag” port
A port must be set up as “Untag” if the device connected to the port must
only communicate with devices belonging to the same VLAN.
Untagged Ethernet frames entering the port are tagged by the XSRING
with the VLAN id code before being transmitted to the SHDSL network or
to other ports of the XSRING.
Already tagged Ethernet frames entering the port are transmitted only if
they belong to the right VLAN.
Reciprocally, Ethernet frames coming from the SHDSL network or from
other ports of the XSRING can be transmitted to the port only if they are
tagged with the right VLAN ID code.
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