Energy Saver

Table 1. Energy Saver product support
Feature	Product	Release introduced
Energy Saver	5320 Series	Fabric Engine 8.6
	5420 Series	VOSS 8.4 Not supported on 5420F-24S-4XE
	5520 Series	VOSS 8.2.5 Not supported on 5520-24X or 5520-48SE Supported on fixed ports only.
	5720 Series	Fabric Engine 8.7
	7520 Series	Fabric Engine 8.10 Supported on 7520-48XT-6C
	7720 Series	Not Supported
	VSP 4900 Series	VOSS 8.1 Supported on VSP4900-48P and ports 1/1 to 1/12 onVSP4900-12MXU-12XE
	VSP 7400 Series	Not Supported

To reduce direct power consumption by up to 40%, Energy Saver uses intelligent-switching capacity reduction in off-peak mode by controlling port link speeds and optionally powering off low priority Power over Ethernet (PoE) devices during off-peak periods. You can schedule Energy Saver to activate during multiple specific time periods. These time periods can be as short as one minute, or can last a week, a weekend, or individual days.

Note

Energy Saver is supported only on copper ports that have auto-negotiation enabled on them.
Energy Saver does not operate on the 5720 Series when you configure local port Auto-Negotiation advertisements to 2500-full or 5000-full.
If auto-negotiation is disabled on a port and a custom port speed is configured, Energy Saver will not change the speed of that port.

Important

Configuring the port link speed to a low value impacts the overall network performance. The best practice is to use the Energy Saver feature during the hours when the network is not overburdened.
If a switch is reset while Energy Saver is activated, the PoE power-saving calculation might not accurately reflect the power saving, and in some cases might display zero savings. This problem occurs because the switch did not have sufficient time to record PoE usage between the reset of the switch and the reactivation of Energy Saver. When Energy Saver is next activated, the PoE power saving calculation is correctly updated.
When Energy Saver is active and you replace a unit, that unit will not be in Energy Saver mode. You must configure Energy Saver directly after replacing a unit.

Interaction with PoE

Energy Saver can use Power over Ethernet (PoE) port-power priority levels to shut down low-priority PoE ports and provide power savings. The power consumption savings of each switch is determined by the number of ports with Energy Saver enabled, and by the power consumption of PoE ports that are powered off. If Energy Saver is disabled on a port, the port is not powered off, irrespective of the PoE configuration. Energy Saver turns off the power to a port only when PoE is enabled globally, the port Energy Saver is enabled, and the PoE priority for the port is configured to Low.

Configuration Fundamentals

To fully configure and use Energy Saver, you must first enable Energy Saver on ports, create a schedule, and then enable Energy Saver globally.

Alternatively, you can configure Energy Saver using the Efficiency Mode quick configuration method, which enables Energy Saver on all ports, creates a default schedule, and enables Energy Saver globally.

You can manually deactivate and reactivate Energy Saver at any time, without affecting the port configurations.

Note

Energy Saver is supported only on copper ports that have auto-negotiation enabled.
Network Time Protocol (NTP) must be enabled and configured to use Energy Saver.