LEGRAND Server Technology PRO3X User Manual page 37

When the chain is established with a single primary unit, and one or more link units, communication
occurs with the primary unit through its IP address. The primary unit, in turn, communicates to the
other link units in the chain through their individual IP addresses, which optimizes monitoring and
management.
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Which models can be linked?
Linking is supported on various products, but all devices in the chain should be the same models,
running the same firmware version.
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Which network setup modes are supported?
For the underlying network, the Linking feature can use the typical network setup modes:
Independent Setup: All units have their own regular IP address. They don't need to be in a physical
chain to be logically chained. You communicate only to the primary using its normal IP address.
Configure networking of the units, and then add link units using the Web GUI, CLI, or USB.
Bridged Setup: Same as Independent Setup, but the units are physically connected as a chain, either by
ethernet or USB. The configuration steps are the same as with Independent Setup.
Port Forwarding Cascade: The units are physically connected as a chain (either by Ethernet or USB).
Only the first primary unit is connected to your network with the IP address you assigned. The other
units will get automatically-assigned private IP addresses. When a Cascading in Port Forwarding mode
configuration is detected, you can automatically convert the cascaded units into Link Units using the
GUI in the primary unit, or add link units with the other methods in the Web GUI, CLI, or USB.
See Cascading Solutions for Xerus
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Can primary units be linked together?
No. Once a unit is designated as the primary unit in a chain, it cannot be linked to a primary unit in
another chain. A primary unit can only be linked to one or more link units in a chain.
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How many units can be linked?
Including the primary, a full chain can include a total of eight units. The first unit added is designated as
the primary unit with the ID "1". Each unit you then add to the chain is designated as a link unit,
beginning with ID "2" and ending with ID "8".
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What is re-linking?
Re-linking is a required function when a link unit no longer recognizes or responds to the primary unit,
most likely caused by the link unit being reset to factory defaults. The status of the disassociated link
unit will be displayed as "Access Denied". Selecting the link unit when in this status displays the Re-link
button that allows reconnection of the link unit in the chain for regaining device control.
Note: Re-linking uses the same Link Unit ID and hostname, but you will need to reauthenticate with
your login credentials.
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