Ap not joining controller

[Solanin19]

Hello everyone,

I have a issue with my AP1815W-E-K9 not joining my  2504 cisco controller.
On the join phase statistics i can read:

Lwapp discovery request rejected
discovery request decoding with subnet rboadcast and wrong AP ip address.
The setup

The configuration on the controller interface:

On the switch:
ip dhcp pool vlan15
network 192.168.15.0 255.255.255.0
default-router 192.168.15.1
ip dhcp pool vlan42
network 192.168.42.0 255.255.255.0
default-router 192.168.42.1
!
interface GigabitEthernet1/0/15
description uplink_wlc_int1
switchport mode trunk
spanning-tree portfast disable
!
interface GigabitEthernet1/0/18
switchport trunk allowed vlan 42
switchport mode trunk
spanning-tree portfast disable
!
interface GigabitEthernet1/0/17
description uplink_AP
switchport access vlan 42
switchport mode access
spanning-tree portfast

Can anyone provide any clarification or recommendations around this for me?

Cheers,

François

[Sandeep Choudhary]

paste the output of this command: sh sysinfo from WLC

Also paste the complete bootup process form AP console.

Info: you need minimum version of 8.4.100.0 to join 1815W AP to WLC.

Regards

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[Solanin19]

Manufacturer's Name.............................. Cisco Systems Inc.

Product Name..................................... Cisco Controller

Product Version.................................. 8.5.131.0

Bootloader Version............................... 1.0.20

Field Recovery Image Version..................... 7.6.101.1

Firmware Version................................. PIC 20.0

OUI File Last Update Time........................ Sun Sep 07 10:44:07 IST 2014

Build Type....................................... DATA + WPS

System Name...................................... cisco-labo

System Location..................................

System Contact...................................

System ObjectID.................................. 1.3.6.1.4.1.9.1.1279

IP Address....................................... 192.168.15.254

IPv6 Address..................................... ::

Last Reset....................................... Software reset

System Up Time................................... 54 days 23 hrs 40 mins 2 secs

System Timezone Location......................... (GMT +1:00) Amsterdam, Berlin,                                                                                         Rome, Vienna

--More-- or (q)uit

System Stats Realtime Interval................... 5

System Stats Normal Interval..................... 180

Configured Country............................... BE  - Belgium

Operating Environment............................ Commercial (0 to 40 C)

Internal Temp Alarm Limits....................... 0 to 65 C

Internal Temperature............................. +31 C

External Temperature............................. +34 C

Fan Status....................................... 3200 rpm

State of 802.11b Network......................... Enabled

State of 802.11a Network......................... Enabled

Number of WLANs.................................. 1

Number of Active Clients......................... 0

OUI Classification Failure Count................. 0

Burned-in MAC Address............................ a

Maximum number of APs supported.................. 75

System Nas-Id.................................... cisco-labo

WLC MIC Certificate Types........................ SHA1/SHA2

I don't know how to access to the consol of the AP, because i don't have the cable to connect the unusual port:

[Sandeep Choudhary]

AP and WLC are in diff VLANS.

whcih method are using to join AP to WLC ?

Where did you configure the DHCP scope for APs ?

My suggestion is to use option 43 on vlan 42.

if you are using DHCP scope on cisoc switch for vlan 42 the use these...

ip dhcp pool <pool name>
network <ip network> <netmask>
default-router <default-router IP address>
dns-server <dns server IP address>
option 43 hex f104c0a80ffe

Regards

Dont forget to rate helpful posts

[Leo Laohoo]

Post the WLC command of "sh time".

[Solanin19]

- The AP must reach the WLC via the cisco switch
- the dhcp is configured on the switch
  I use the option 43, no change

(Cisco Controller) >show time

Time............................................. Mon Sep 10 11:44:37 2018

Timezone delta................................... 0:0

Timezone location................................ (GMT +2:00) Jerusalem

NTP Servers

    NTP Version..................................     3

    NTP Polling Interval.........................     600

     Index     NTP Key Index                  NTP Server                Status          NTP Msg Auth Status

    -------  ---------------------------------------------------------------------

[Leo Laohoo]

Time and date is not correct.
This is why the WLC won't let the AP join.

[Solanin19]

I corrected the time , it's the same time now on the controller and the switch. Still not working. 

[Leo Laohoo]

Connect a console cable and reboot the AP.
Post the entire boot-up process.

[Sandeep Choudhary]

you need to correct the OPTION 43. something wrong you are doing here!!!!!

Aletrnate:  try to put AP in vlan 15(same as WLC) and try again....I am sure it will join to WLC.

Regards

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[Solanin19]

I did configure  like you told me the option 43:
"ip dhcp pool <pool name>
network <ip network> <netmask>
default-router <default-router IP address>
dns-server <dns server IP address>
option 43 hex f104c0a80ffe" 

Should i delete it now ?

[Sandeep Choudhary · Accepted solution]

dont delete it.  Just put AP in vlan 15 and try again.

interface GigabitEthernet1/0/17
description uplink_AP
switchport access vlan 42

switchport access vlan 15
switchport mode access
spanning-tree portfast

Regards

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[pieterh]

you configure tie option43 with the wlc adres in the vlan 15 

but the AP is directly connected on vlan 42

-> rboadcast for address vlan15 is not accepted on vlan42

is the switch configured for any routing between vlan15 and vlan 42?

(no "ip routing" in the config section displayed)

if not, the ap cannot reach the controller

-> you have different solutions 

1) enable routing (+ disable vlan 15 for ap management)

2) change ap vlan to vlan15 (+ disable vlan 15 for ap management)

3) remove option 43 in the dhcp scope ( discovery is by broadcast)

4) change option 43 to vlan42 address

[jain.manish94]

try 

int gi 1/0/17

switchport mode trunk

switchport trunk native vlan 100 

shut

no shut the port. 

what is native vlan ?