Port Prioritization - Allied Telesis AT-IS230-10GP Installation Manual

IS Series Industrial Ethernet Layer 2 Switch Installation Guide
Port
If the power requirements of the powered devices exceed the switch's
power budget, the switch denies power to some ports based on a system
Prioritization
called port prioritization. You may use this mechanism to ensure that
powered devices critical to the operations of your network are given
preferential treatment by the switch in the distribution of power should the
demands of the devices exceed the available PoE power capacity.
AT-IS130-6GP Switch
When the switch power is OFF and the ports are connected to PoE
devices, PoE power is provided to the lowest port first and then to the
ports in ascending order as long as the overall switch budget is not
exceeded. If the PoE power budget is exceeded, there is no power
provided to the higher ports.
When the switch power is ON and PoE devices are randomly connected to
the switch ports, then power will be supplied to the ports in the order that
they are connected.
AT-IS230-10GP Switch
You can configure the port priority feature using the management
software. There are three priority levels: Critical, High, and Low.
Ports set to the Critical level, the highest priority level, are guaranteed
power before any of the ports assigned to the other two priority levels.
Ports assigned to the other priority levels receive power only if all the
Critical ports are receiving power. Ports that are connected to your most
critical powered devices should be assigned to this level. If there is not
enough power to support all the ports set to the Critical priority level, power
is provided to the ports in ascending order starting with the lowest port
number.
The High level is the second highest level. Ports set to this level receive
power only if all the ports set to the Critical level are already receiving
power. If there is not enough power to support all of the ports set to the
High priority level, power is provided to the ports in ascending order
starting with the lowest port number.
The lowest priority level is Low. This is the default setting. Ports set to this
level only receive power if all of the ports assigned to the other two levels
are already receiving power. As with the other levels, if there is not enough
power to support all of the ports set to the Low priority level, power is
provided to the ports in ascending order starting with the lowest port
number.
Power allocation is dynamic. Ports supplying power to powered devices
may cease power transmission if the switch's power budget is at maximum
usage and new powered devices, connected to ports with higher priorities,
become active.
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