How to see if Option 43 is working for the AP

guibarati · ‎09-19-2008

I have configured my dhcp server to provide the WLC IP address to the APs over the option 43, but the AP is not joining to the controller.

I just wanted to check in the AP to see if it's looking for the right controller IP to be sure it was able to get it correclty from DHCP.

I tried to find some console line command to do that but i couldn't find.

the "show lwapp ip..." shows only the manyally configured informations, I would like some command that would say "I'm looking for this controller" is there anyone?

grzegorz.ciolek · ‎09-19-2008

Hi

Connect to LAP and see what is gong on. I will provide you two outputs from LAP. One with improper DHCP option set and one with good.

First:

Cisco IOS Software, C1250 Software (C1250-RCVK9W8-M), Version 12.4(10b)JA1, RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Compiled Wed 30-Jan-08 12:11 by prod_rel_team

*Mar 1 00:00:07.939: %LINK-3-UPDOWN: Interface GigabitEthernet0, changed state to up

*Mar 1 00:00:08.939: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0, changed state to up

ap>

*Mar 1 00:00:26.983: %LWAPP-5-CHANGED: LWAPP changed state to DISCOVERY

*Mar 1 00:00:27.135: Logging LWAPP message to 255.255.255.255.

~

%DHCP-6-ADDRESS_ASSIGN: Interface GigabitEthernet0 assigned DHCP address 10.0.0.5, mask 255.255.255.0, hostname AP

%CDP_PD-4-POWER_OK: Full power - NEGOTIATED inline power source

Translating "CISCO-LWAPP-CONTROLLER"...domain server (255.255.255.255)

%LWAPP-3-CLIENTEVENTLOG: Did not get log server settings from DHCP.

%LWAPP-3-CLIENTEVENTLOG: Did not get any DNS options from DHCP. <<<<<<<<<<<<<<<============== IMPROPPER DHCP OPTION SET

%SYS-6-LOGGINGHOST_STARTSTOP: Logging to host 255.255.255.255 started - CLI initiated

%LWAPP-3-CLIENTEVENTLOG: Performing DNS resolution for CISCO-LWAPP-CONTROLLER

%LWAPP-3-CLIENTERRORLOG: DNS Name Lookup: could not resolve CISCO-LWAPP-CONTROLLER

Second:

*Mar 1 00:00:09.831: %SYS-5-RESTART: System restarted --

Cisco IOS Software, C1250 Software (C1250-K9W8-M), Version 12.4(16b)JA, RELEASE SOFTWARE (fc3)

Technical Support: http://www.cisco.com/techsupport

Compiled Mon 07-Jul-08 18:19 by prod_rel_team

*Mar 1 00:00:09.831: %SNMP-5-COLDSTART: SNMP agent on host AP is undergoing a cold start

*Mar 1 00:00:10.871: %SSH-5-ENABLED: SSH 2.0 has been enabled

*Mar 1 00:00:10.875: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0, changed state to up

*Mar 1 00:00:11.199: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset

*Mar 1 00:00:12.343: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down

*Mar 1 00:00:28.443: %LWAPP-5-CHANGED: LWAPP changed state to DISCOVERY

*Mar 1 00:00:28.447: bsnInitRcbSlot: slot 1 has NO radio

*Mar 1 00:00:28.451: bsnUnlockDevice: not bring radio up: radio 1 is in admin disable state

*Mar 1 00:00:28.611: Logging LWAPP message to 255.255.255.255.

%CDP_PD-4-POWER_OK: Full power - NEGOTIATED inline power source

%LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up

%SYS-6-LOGGINGHOST_STARTSTOP: Logging to host 255.255.255.255 started - CLI initiated

%DHCP-6-ADDRESS_ASSIGN: Interface GigabitEthernet0 assigned DHCP address 10.0.0.22, mask 255.255.255.0, hostname AP

Translating "CISCO-LWAPP-CONTROLLER"...domain server (xxx.xx.64.2)

%LWAPP-3-CLIENTEVENTLOG: Controller address xxx.xx.65.130 obtained through DHCP

%LWAPP-3-CLIENTEVENTLOG: Did not get log server settings from DHCP.

%LWAPP-3-CLIENTEVENTLOG: Performing DNS resolution for CISCO-LWAPP-CONTROLLER

%LWAPP-3-CLIENTERRORLOG: DNS Name Lookup: could not resolve CISCO-LWAPP-CONTROLLEREncoding the APType as 0

Encoding the RSSI threshhold as 0

Encoding the APType as 0

Encoding the RSSI threshhold as 0

%LWAPP-5-CHANGED: LWAPP changed state to JOIN

%LINK-5-CHANGED: Interface Dot11Radio0, changed state to administratively down

%LWAPP-5-CHANGED: LWAPP changed state to CFG

%LWAPP-5-CHANGED: LWAPP changed state to DOWN

%LWAPP-5-CHANGED: LWAPP changed state to UP

%LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up

%LWAPP-3-CLIENTEVENTLOG: AP has joined controller WLC_1

Hope this help

Regards

Greg

guibarati · ‎09-19-2008

Thanks for the reply,

Take a look how does it goes at my side, everything seems to be right, there is the "Specific Vendor Attribute" Option 43 = ABCD.. (the controller's IP in hex format) is it right?

grzegorz.ciolek · ‎09-21-2008

Hi

Do you have firewall between WLC and LAP. You have to allow ports 12222 (data) and 12223 (control) to AP manager

Regards

Greg