• Author : Tom Meng


Power over Ethernet (PoE)

Description Power over Ethernet (PoE) is a way of delivering power and data over the same Ethernet wires. There have been multiple IEEE standards for PoE over the years: 802.3af-2003 (PoE) Рup to 15 W per port 802.3at-2009 (PoE+) Рup to 30 W per port 802.3bt-2018 (4PPoE) Рup to 90 W per port (Arista products currently only support up to 60 W per port) Arista’s PoE switches are compliant with the IEEE standards. There exist various other legacy and proprietary PoE standards. EOS is not guaranteed to work with legacy and proprietary PoE standards, but some such...
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Power management

Description Power management is a way to limit the total available power to be used for Power over Ethernet (PoE) ports. Without power management, the total amount of power that the power supply units (PSU) are able to provide is used. Power management can be used to create power redundancies. For example, if a system has 2 1050W PSUs, the feature can set the total available power to be 800W for PoE. With this configuration, 1 PSU is sufficient to power the system and the unused PSU acts as a backup source, thus giving the system a 1+1 redundancy. Platform...
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Configurable Power Supply Voltage Warning

Introduction Starting from EOS 4.20.5F, power supply low input voltage warning can be configured via a CLI command. Prior to the feature availability, the low input voltage signal was relied on from the power supply themselves. Some power supplies have warning thresholds and failing thresholds values vary close to each other, and accuracy was lacking when it came to reporting the warning message before a power supply shutdown. This CLI command can be used to set the low input voltage threshold to the value customers require. This command also provides the option to configure the maximum number of fault readings...
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