Chapter 55 Configuring a VoIP Network

Configuring VoIP on a Switch

Setting the Power Mode of a Port or a Group of Ports

To set the power mode of a port or a group of ports, perform this task in normal mode:

Task

Command

 

 

Set the power mode of a port or a group of ports.

set port inlinepower mod/port {[auto static]

 

[max-wattage] off}

 

 

Note If you configure the max-wattagevalues that are multiples of 500 on a Catalyst 6500 series switch with the set port inlinepower mod/port static auto max-wattagecommand, the power that is drawn from the global allocation is possibly slightly smaller than the power that is reported in the Total PWR Allocated to Module field of the show environment power command. This discrepancy is due to the internal conversion of units from Watts to cAmps and back to Watts. The difference between the total allocated power and the total power that is drawn from the system is no more than +/- 0.42 W.

This example shows how to set the power mode of a port or group of ports:

Console> (enable) set port inlinepower 2/5 off

Inline power for port 2/5 set to off.

Console> (enable) set port inlinepower 2/3-9 auto 800

Inline power for ports 2/3-9 set to auto and max-wattage to 800.

Console> (enable)

Setting the Default Power Allocation

The set inlinepower defaultallocation command is global and only affects Cisco IP phones. The inline power threshold notification generates a syslog message when the inline power usage exceeds the specified threshold. To set the default power allocation, perform this task in privileged mode (the default allocation value is 15400 milliwatts):

Caution The set inlinepower defaultallocation command can be harmful when there is not enough power in the system to bring up all connected inline power devices. If you set a small value for the power allocation, all connected inline power devices initially will be powered up. However, after receiving CDP messages, the system will learn that devices are consuming more power and deny power to some of the ports.

Setting a small value might also result in the overdrawing of power for some time with unanticipated results, such as hardware failures and unexpected resets.

Note 7000 milliwatts is the maximum power supported for these modules: WS-X6348-RJ21V, WS-X6348-RJ-45V, WS-X6148-RJ-45V, and WS-X6148-RJ21V.

Task

Command

 

 

Set the default power allocation.

set inlinepower defaultallocation value

 

 

 

 

Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7

 

 

 

 

 

 

OL-8978-02

 

 

55-17

 

 

 

 

 

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Cisco Systems OL-8978-02 Setting the Power Mode of a Port or a Group of Ports, Setting the Default Power Allocation, 55-17
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OL-8978-02 specifications

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