Release Notes

Release Notes for Cisco Wireless LAN Controllers and Lightweight Access Points for Release 4.2.176.0

OL-31336-01

Important Notes

Inaccurate Transmit Power Display

After you change the position of the 802.11a radio antenna for a lightweight 1200 or 1230 series access

point, the power setting is not updated in the controller GUI and CLI. Regardless of the user display, the

internal data is updated, and the transmit power output is changed accordingly. To see the correct

transmit power display values, reboot the access point after changing the antenna’s position.

(CSCsf02280)

Setting the Retransmit Timeout Value for TACACS+ Servers

Cisco recommends that the retransmit timeout value for TACACS+ authentication, authorization, and

accounting servers be increased if you experience repeated reauthentication attempts or the controller

falls back to the backup server when the primary server is active and reachable. The default retransmit

timeout value is 2 seconds and can be increased to a maximum of 30 seconds.

Configuring an Access Point’s Prestandard Power Setting

An access point can be powered by a Cisco prestandard 15-watt switch with Power over Ethernet (PoE)

by entering this command:

config ap power pre-standard {enable | disable} {all | Cisco_AP}

A Cisco prestandard 15-watt switch does not support intelligent power management (IPM) but does have

sufficient power for a standard access point. The following Cisco prestandard 15-watt switches are

available:

• AIR-WLC2106-K9

• WS-C3550, WS-C3560, WS-C3750

• C1880

• 2600, 2610, 2611, 2621, 2650, 2651

• 2610XM, 2611XM, 2621XM, 2650XM, 2651XM, 2691

• 2811, 2821, 2851

• 3631-telco, 3620, 3640, 3660

• 3725, 3745

• 3825, 3845

The enable version of this command is required for full functionality when the access point is powered

by a Cisco prestandard 15-watt switch. It is safe to use if the access point is powered by either an IPM

switch or a power injector or if the access point is not using one of the 15-watt switches listed above.

You might need this command if your radio operational status is “Down” when you expect it to be “Up.”

Enter the show msglog command to look for this error message, which indicates a PoE problem:

Apr 13 09:08:24.986 spam_lrad.c:2262 LWAPP-3-MSGTAG041: AP 00:14:f1:af:f3:40 is unable to

verify sufficient in-line power. Radio slot 0 disabled.