Alcatel OS6850-P48 User Guide - Page 157

Managing Power over Ethernet (PoE) Configuring Power over Ethernet Parameters Configuring the Total Power Available to a slot Like the maximum port power allowance, the system software also provides a maximum slot-wide power allowance. By default, each slot is authorized by the system software to use a number of watts to power all devices connected to its ports depending on which power supply is used. As with the maximum port power allowance, the user can either increase or decrease this value based on the allowed ranges specified in Chapter 5, "Managing Power over Ethernet (PoE)." Note: Increasing or decreasing the total power available to a slot is designed for use on chassis-based products which share PoE power among the slots. For stackable products this command has no affect on other stack elements since each switch has a dedicated power supply. Important. Decreasing the slot-wide power could cause lower priority ports to lose power if the new value is less than the total PoE power currently being consumed. To increase or decrease the total power available to a slot, use the lanpower maxpower command. Since you are setting the power allowance for an individual slot, you must specify a slot number in the command line. For example, the syntax -> lanpower 3 maxpower 80 reduces the power allowance of slot 3 to 80 watts. This value is now the maximum amount of power the slot can use to power all attached devices (until the value is modified by the user). Note. Changing the maximum power available to a slot or port does not reserve or immediately allocate that power. These settings are only used for configuring a maximum amount of power that may be used, any unused power is still available and remains a part of the overall PoE budget. Setting Port Priority Levels As not all Powered Devices (PDs) connected to the switch have the same priority within a network setting, the OmniSwitch allows the administrator to specify priority levels on a port-by-port basis. Priority levels include low, high, and critical. The default priority level for a port is low. • Low. This default value is used for port(s) that have low-priority devices attached. In the event of a power management issue, inline power to low-priority is interrupted first (i.e., before critical and highpriority). • High. This value is used for port(s) that have important, but not mission-critical, devices attached. If other ports in the chassis have been configured as critical, inline power to high-priority is given second priority. • Critical. This value is used for port(s) that have mission-critical devices attached, and therefore require top (i.e., critical) priority. In the event of a power management issue, inline power to critical is maintained as long as possible. To change the priority level for a particular port, use the lanpower priority command. Since the switch allows you to set priority levels on a port-by-port basis, be sure to specify slot/port information in the command line. For example, the syntax -> lanpower 8/22 priority critical OmniSwitch 6850/6850E Series Hardware Users Guide June 2011 page 5-7