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New Member

Wireless AP's - High CPU


I work at an airport and we offer free wireless. We have about 20 AP's that are configured for the free wireless. Recently, I've been receiving alerts via Solarwinds that all 20 AP's have high CPU (> 80%). I performed a Wireshark on one of the affected AP's and everything looks quite normal. I looked at the Switchport statistics for the same AP and all looks fine. Any idea's on where I should focus my attention?

Cisco Employee

Wireless AP's - High CPU


Do you have loopback interfaces configured on the APs?  Could be caused by some kind of storm...

Please review this post from support forums.. Might be related to your issue.


New Member

Wireless AP's - High CPU


No loopback interfaces.

Cisco Employee

Wireless AP's - High CPU

HI Thomas,

I see.

Here are some points to check:

1. identify which process is taking high % cpu , show proc cpu | ex 0.00

2. Is the AP residing on a non-vlan 1 network ?

3. Check the switch % CPU too and identify which process is taking the highest % CPU.

4. Observe the broadcast counter on an interface connected to an AP., show interface Gix/y | in broadcast


New Member

Wireless AP's - High CPU


Thank-you for the tips. Regarding point 4, what would be an abnormal amount of broadcast for normal AP traffic? Have a great day!

New Member

Wireless AP's - High CPU

CPU utilization for five seconds: 95%/94%; one minute: 78%; five minutes: 76%

PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process

  10     4021906   9180386        438  0.23%  0.13%  0.12%   0 ARP Input

  16     2944776  20673592        142  0.15%  0.25%  0.24%   0 Net Background

  23     3171526  35394775         89  0.15%  0.04%  0.05%   0 Dot11 driver

  62     6357277  18376242        345  0.07%  0.17%  0.22%   0 HyBridge Input P

Hall of Fame Super Gold

Wireless AP's - High CPU

Is this autonomous or controller-based AP?

If autonomous, can you post the output to the command "sh version"?

New Member

Wireless AP's - High CPU

They're all autonomous. We do have a mixuture of different model AP's. This sh version is one of the problem AP's.

Cisco IOS Software, C1200 Software (C1200-K9W7-M), Version 12.3(7)JA2, RELEASE SOFTWARE (fc1)

Technical Support:

Copyright (c) 1986-2005 by Cisco Systems, Inc.

Compiled Fri 18-Nov-05 12:43 by ssearch

ROM: Bootstrap program is C1200 boot loader

BOOTLDR: C1200 Boot Loader (C1200-BOOT-M) Version 12.3(2)JA4, RELEASE SOFTWARE (fc1)

XXXXXX uptime is 3 years, 47 weeks, 22 hours, 44 minutes

System returned to ROM by power-on

System restarted at 23:50:15 R Mon Apr 5 2010

System image file is "flash:/c1200-k9w7-mx.123-7.JA2/c1200-k9w7-mx.123-7.JA2"

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

cisco AIR-AP1231G-A-K9     (PowerPC405GP) processor (revision A0) with 14838K/1536K bytes of memory.

Processor board ID FOC09420K0R

PowerPC405GP CPU at 196Mhz, revision number 0x0145

Last reset from power-on

1 FastEthernet interface

1 802.11 Radio(s)

32K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address: 00:15:F9:22:05:BD

Part Number                          : 73-8704-10

PCA Assembly Number                  : 800-23211-11

PCA Revision Number                  : A0

PCB Serial Number                    : FOC09420K0R

Top Assembly Part Number             : 800-23304-11

Top Assembly Serial Number           : FTX1006J01R

Top Revision Number                  : A0

Product/Model Number                 : AIR-AP1231G-A-K9

Configuration register is 0xF