Tag: Cisco

Setting up a Cisco AP using the command line

by Samuel Mitchell, posted in Cisco, Network Virtualization, Uncategorized, Wireless

This article is to document the CLI commands used to configure an Autonomous Cisco Access Point.

To configure the AP management IP address use the following command:

Interface BVI1

ip address [ip] [subnetmask]

no shutdown

Next, define the SSID properties including Name, Key method and password.

This particular configuration is using WPA2 to authenticate the users.

dot11 ssid [SSIDName]

authentication open
authentication key-management wpa version 2
guest-mode
wpa-psk ascii [password]

Next you will push this SSID on the 2.4 Ghz which is on interface dot1Radio 0 and if you want it to be available on 5 Ghz band as well, you will configure it on dot1Radio 1. The radio will be using the AES-CCM encryption mode.

interface dot1radio0

encryption mode ciphers aes-ccm

ssid [SSID-name]

no shutdown

Once you are done, you can save the configuration and test you wireless device.

Cisco 2960 Error: %ILPOWER-3-CONTROLLER_PORT_ERR: Controller port error: Power Controller reports power supply VEE under voltage and lockout

by Samuel Mitchell, posted in Cisco, Routing & Switching, VoIP

I got a report that all our VoIP phone were down in a particular area that were connected to a Cisco 2960 switch. Upon investigation,

Initially, I ran the following show commands to check the status of the ports and power:

show power inline

The switch output:

showpowerinline

It was indicating that there was no device drawing power from the switch which was strange because there were VoIP phones connected to this switch.

With further checks, I came across these errors in the event logs:

poe_error

This error was telling me either the switch power module failed or some device caused a surge in power that causes the port power module to overload.

My resolution: Restart the switch which restored the switch to normal operations.

Being curious about the error, I researched it and came across this Cisco report:

https://quickview.cloudapps.cisco.com/quickview/bug/CSCsw18530

It was stating that this error is due to a bug in a particular version of IOS for 2960 switches.

The solution is:

Workaround:

Longer cable (>50ft) seems to fix the issue in most cases.

Solution

This issue is fixed in 12,2(55)SE3 , 12.2(58)SE1 and later releases. The
following interface configuration commands have to be applied to resolve the
issue,

Switch(config)# int x/y
Switch(config-if)# power inline port 2x-mode
Switch(config-if)# shut
Switch(config-if)# no shut

The fix is present in the following platforms :

3750-E,3560-E, 3750-X, 3560-X, 3560-C, 2960S, 2960,2960C,2960X

The other platforms do not support 2X power mode and the workaround would be to
use a longer cable.