Managing Power over Ethernet (PoE)
Configuring Power over Ethernet Parameters
OmniSwitch 6850/6850E Series Hardware Users Guide
June 2011
page 5-7
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 high-
priority).
•
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 main-
tained 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
