LEGRAND Server Technology PRO3X User Manual page 174

Field
Port forwarding role
(available on all cascaded
devices)
Downstream interface
(available on the primary
device only)
4) (Optional) Configure the network settings by clicking the BRIDGE, ETH1/ETH2, or WIRELESS section
on the same page.
• In the Bridging mode, each cascaded device can have different network settings. You may need to •
configure each device's network settings in the BRIDGE section.
• • In the Port Forwarding mode, all cascaded devices share the primary device's network settings. You
only need to configure the primary device's network settings in the ETH1/ETH2 and/or WIRELESS
section.
Tip: You can enable/configure multiple network interfaces in the Port Forwarding mode so that the
cascading chain has multiple IP addresses.
5) Click Save.
▶
Recommendations for cascade loops:
You can connect both the first and the last PDU to your network (cascade loop) under the following
conditions:
• •
Bridging mode only.
• •
The remaining network MUST use R/STP to avoid network loops.
AND
• • Both the first and the last PDUs MUST either attach to the same switch or, if they are attached to
two separate switches, you must configure both ports of these switches so that the STP costs are
high. This prevents the STP protocol from sending unrelated traffic through the PDU cascade, which
can cause bottlenecks that lead to connectivity issues in the whole network.
Cascading Modes Overview
The cascading mode is a network configuration setting that determines how each device in the chain is
accessed.
There are two cascading modes: Bridging and Port Forwarding.
In the following illustration, it is assumed that users enable the DHCP networking for the cascading
chain comprising four devices. In the diagrams, "P" is the primary device and "E" is an expansion device.
▶
"Bridging" mode:
174
Description
Primary or Expansion.
This is to determine which device is the primary and
which ones are expansion devices.
USB or ETH1/ETH2.
This is to determine which port on the primary
device is connected to Expansion 1.
If ETH1 or ETH2 is selected as the downstream
interface, make sure the selected Ethernet interface
is enabled.