Cisco WIRELESS LAN CONTROLLER OL-17037-01 - Manual (Page 73)

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Cisco Wireless LAN Controller Configuration Guide
OL-17037-01
Chapter 7 Controlling Lightweight Access Points
Configuring Power over Ethernet
The PoE Status field shows the power level at which the access point is operating: High (20 W), Medium
(16.8 W), or Medium (15.4 W). This field is not configurable. The controller auto-detects the access
point’s power source and displays the power level here.
Note This field applies only to 1250 series access points that are powered using PoE. There are two
other ways to determine if the access point is operating at a lower power level. First, the “Due
to low PoE, radio is transmitting at degraded power” message appears under the Tx Power Level
Assignment section on the 802.11a/n (or 802.11b/g/n) Cisco APs > Configure page. Second, the
“PoE Status: degraded operation” message appears in the controller’s trap log on the Trap Logs
page.
Step 3 Perform one of the following:
• Check the Pre-Standard State check box if the access point is being powered by a high-power
Cisco switch. These switches provide more than the traditional 6 Watts of power but do not support
the intelligent power management (IPM) feature. These switches include:
– 2106 controller,
– WS-C3550, WS-C3560, WS-C3750,
– C1880,
– 2600, 2610, 2611, 2621, 2650, 2651,
– 2610XM, 2611XM, 2621XM, 2650XM, 2651XM, 2691,
– 2811, 2821, 2851,
– 3620, 3631-telco, 3640, 3660,
– 3725, 3745,
– 3825, and 3845.
• Uncheck the Pre-Standard State check box if power is being provided by a power injector or by a
switch not on the above list.
Step 4 Check the Power Injector State check box if the attached switch does not support IPM and a power
injector is being used. If the attached switch supports IPM, you do not need to check this check box.
Step 5 If you checked the Power Injector State check box in the previous step, the Power Injector Selection and
Injector Switch MAC Address parameters appear. The Power Injector Selection parameter enables you
to protect your switch port from an accidental overload if the power injector is inadvertently bypassed.
Choose one of these options from the drop-down box to specify the desired level of protection:
• Installed—This option examines and remembers the MAC address of the currently connected
switch port and assumes that a power injector is connected. Choose this option if your network
contains older Cisco 6-Watt switches and you want to avoid possible overloads by forcing a
double-check of any relocated access points.
If you want to configure the switch MAC address, enter the MAC address in the Injector Switch
MAC Address field. If you want the access point to find the switch MAC address, leave the Injector
Switch MAC Address field blank.
Note Each time an access point is relocated, the MAC address of the new switch port fails to
match the remembered MAC address, and the access point remains in low-power mode. You
must then physically verify the existence of a power injector and reselect this option to cause
the new MAC address to be remembered.