Reference Guide

Table Of Contents

Format no file verify

Mode Global Conﬁg

write memory

Use this command to save running conﬁguration changes to NVRAM so that the changes you make will

persist across a reboot. This command is the same as copy system:running-conﬁg nvram:startup-conﬁg.

Use the conﬁrm keyword to directly save the conﬁguration to NVRAM without prompting for a

conﬁrmation.

Format write memory [confirm]

Mode Privileged EXEC

Power Over Ethernet Commands

This section describes the commands used to conﬁgure and monitor PoE (Power over Ethernet). PoE

allows IP telephones, wireless LAN access points, and other appliances to receive power as well as data

over existing LAN cabling without modifying the existing Ethernet infrastructure. PoE is only available

on switches that contain a PoE controller.

PoE implements the PoE+ speciﬁcation (IEEE 802.3at) for power sourcing equipment (PSE). IEEE

802.3at allows power to be supplied to Class 4 PD devices that require power greater than 15.4 Watts

and up to 34.2 Watts. This allows the PoE+ enabled network switches and routers to be used for

deployment with devices that require more power than the 802.3AF speciﬁcation allows. PoE+ 802.3at

is compatible with 802.1AF.

Flexible Power Management

PoE provides power management that supports power reservation, power prioritization, and power

limiting. The operator can assign a priority to each PoE port. When the power budget of the PoE switch

has been exhausted, the higher priority ports are given preference over the lower priority ports. Lower

priority ports are forcibly stopped to supply power in order to provide power to higher priority ports.

The static power management feature allows operators to reserve a guaranteed amount of power for a

PoE port. This is useful for powering up devices which draw variable amounts of power and provide

them an assured power range within which to operate. Class-based power management allocates

power at class limits as opposed to user-deﬁned limits.

In the Dynamic Power management feature, power is not reserved for a given port at any point of time.

The power available with the PoE switch is calculated by subtracting the instantaneous power drawn by

all the ports from the maximum available power. Thus, more ports can be powered at the same time.

This feature is useful to eciently power up more devices when the available power with the PoE switch

is limited.

Utility Commands

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