Cisco EnergyWise IOS Configuration Guide, EnergyWise Version 2.8
Understanding Cisco EnergyWise
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Cisco EnergyWise Overview

Table Of Contents

Cisco EnergyWise Overview

Cisco EnergyWise Network

EnergyWise Domain

Power Level Energy Management





Cisco EnergyWise Overview

Cisco EnergyWise Network

EnergyWise Domain

Power Level Energy Management





Note If your switch is stacking-capable (for example, a Catalyst 3750-X, 3750-E, or 3750), the term switch refers to both a standalone switch and a switch stack unless otherwise noted.

Warning Voice over IP (VoIP) service and the emergency calling service do not function if power fails or is disrupted. After power is restored, you might have to reset or reconfigure equipment to regain access to VoIP and the emergency calling service. In the USA, this emergency number is 911. You need to be aware of the emergency number in your country. Statement 361.

For information about this warning, see the "Important Notice" appendix.

Cisco EnergyWise Network

In a network, Cisco EnergyWise monitors and manages the power usage of network devices and devices connected to the network.

Figure 1-1 Cisco EnergyWise Network

Management stations—Control applications and devices that use EnergyWise to monitor and manage the power usage of domain members and endpoints. Management stations also send queries to domain members.

Domain members—Include Cisco switches, routers, and network devices. They forward messages across an EnergyWise domain to endpoints. They also forward and reply to queries from the management station and other domain members and aggregate power-usage information from the endpoints.

Endpoints—Devices that are connected to a domain member and that use power. They respond to queries but do not send or forward them. You can install the SDK library on IP endpoints. A Cisco EnergyWise domain member can also use SNMP to communicate with endpoint devices.

Domain members and endpoints receive power from an AC or DC power source or a power supply.

PoE domain members and endpoints also receive power from PoE switches or Cisco EtherSwitch service modules. For example, IP phones and access points connected to a PoE switch receive power from the switch.

EnergyWise Domain

A Cisco EnergyWise domain is considered to be one unit of power management. The domain consists of Cisco networking devices, Power over Ethernet (PoE) endpoints, and endpoints running agents that are built using the software development kit (SDK) library. This domain is similar to a network-management community such as a VLAN Trunking Protocol (VTP) domain.

For example, if you have a building with a core router, 10 access switches, and 400 endpoints, such as, phones, access points, and PCs, you can create an EnergyWise domain called MyBuilding with the router and switches as domain members.

If you want to implement power management applications on a management station and endpoints, all the domain members must run Cisco EnergyWise Version 2.6 or later.

After you enable and configure EnergyWise on the core router and access switches, the MyBuilding domain configures itself. Neighbor relationships are set among the domain members.

Domain members use CDP when it is enabled or EnergyWise UDP messages to automatically discover neighbors.

You can manually configure static neighbors.

Each domain member sets up a parent-child relationship with an attached endpoint. For example, an IP phone (child) is connected to a PoE switch (parent), or a PC (child) is connected to a router (parent).

After the domain is set, a domain member can forward queries and control messages to other domain members and endpoints.

You can:

Use SNMP or a management station to query every domain member or endpoint.

Use the domain member CLI to run an EnergyWise query to receive or set power usage information.

Use a management application, server, or domain member CLI to define power usage policies or receive power usage information.

Power Level Energy Management

Cisco EnergyWise uses a set of power levels to consistently manage power usage. A power level is a measure of the energy consumed by devices in an EnergyWise network.

The range is from 0 to 10. The default is 10.

Table 1-1 Power Levels 


























Shut off

The devices in an EnergyWise network can be from different manufacturers.

Note A Cisco switch does not support level 0. You cannot turn off the power on a switch.

A PoE endpoint, such as an IP phone, receives power from a PoE switch port. The following are the PoE endpoint power charecteristics:

The power level applies to the port.

The port supports levels 0 to 10.

If the port power level is 0, the port does not provide power to connected endpoints.

If the power level is between 1 and 10, the port is operational.


Table 1-2 Cisco Energywise Attributes



Device rating based on the business or deployment context.

The range is from 1 (least important) to 100 (most important).

The default is 1.


Device description (other than the name or role) for which query results are filtered.



Device identity for which query results are filtered.

For a PoE port, the short version of the port name. For example, Gi0.2 for Gigabit Ethernet 0/2.

For a domain member, the hostname.

For an endpoint, see the endpoint documentation. We recommend that you use the hostname.


Device function based on the business or deployment context.

For a PoE port, the default is interface.

For a domain member, the default can be the model number or the supervisor model number.

For an endpoint, see the endpoint documentation.


A recurrence is an event that repeats on a regular schedule. You can use this feature to schedule jobs to run periodically or at certain times or date. For example, you can configure the domain member to power an endpoint or interface on and off based on the time or date.

A recurrence uses the domain member time.

When configuring recurrences, you specify the time in CRON format (24-hour format). Cron is the time-based job scheduler in Unix-like computer operating systems.

When a recurrence event occurs, changes to the Cisco EnergyWise power level exist only in the running configuration and are not saved in the startup configuration. If the domain member fails and then restarts, it uses the power level in the saved startup configuration.


A Cisco EnergyWise network has three levels of security to prevent unauthorized communication.

The management secret authenticates communication between the domain members and the management station.

The domain secret authenticates communication between domain members.

The endpoint secret authenticates communication between domain members and endpoints.

The network enforces security with shared secrets, also referred to as passwords.

Figure 1-2 Cisco EnergyWise Security Levels


Cisco EnergyWise domain members support the CISCO-ENERGYWISE-MIB.

To locate and download MIBs for a specific Cisco product and release, use the Cisco MIB Locator at: