ā10-29-2013 03:02 AM - edited ā07-04-2021 01:10 AM
following log entry on a WLC5508 (7.4.100.0) is permanentely filling up the log buffer and the WLC operates in low performance.
*spamApTask7: Oct 29 10:08:13.114: #LWAPP-3-DUP_AP_IP: spam_lrad.c:33673 Duplicate IP address detected for AP APb0fa.eb3d.8b4f, IP address of AP 0.2.146.0, this is a duplicate of IP on another machine (MAC address 4:ba:53:e0: 0: 0)
*spamApTask0: Oct 29 10:08:04.478: #LWAPP-3-DUP_AP_IP: spam_lrad.c:33673 Duplicate IP address detected for AP APb0fa.ebb8.de74, IP address of AP 0.2.146.0, this is a duplicate of IP on another machine (MAC address 4:b9:c8: 0: 0: 0)
*spamApTask7: Oct 29 10:07:43.113: #LWAPP-3-DUP_AP_IP: spam_lrad.c:33673 Duplicate IP address detected for AP APb0fa.eb3d.8b4f, IP address of AP 0.2.146.0, this is a duplicate of IP on another machine (MAC address 4:ba:53:e0: 0: 0)
*spamApTask0: Oct 29 10:07:34.477: #LWAPP-3-DUP_AP_IP: spam_lrad.c:33673 Duplicate IP address detected for AP APb0fa.ebb8.de74, IP address of AP 0.2.146.0, this is a duplicate of IP on another machine (MAC address 4:b9:c8: 0: 0: 0)
Has somebody an idea what the issue is or can be? Or has it been monitored from someone else on other installations as well?
Both AP's does have different IP adresses from DHCP server x.y.z.248 and x.y.z.249. WLC is working as internal DHCP server. DHCP proxy is disabled. From what could this strange address 0.2.146.0 come from? I've never seen such an address like 0.2.146.0
I would like to appriciate any kind of help or suggestions
thanks a lot
Klaus
ā10-31-2013 06:10 PM
This is another common issue that is seen when the AP tries to join the WLC. You might see this error message when the AP tries to join the controller.
No more AP manager IP addresses remain
One of the reasons for this error message is when there is a duplicate IP address on the network that matches the AP manager IP address. In such a case, the LAP keeps power cycling and cannot join the controller.
The debugs will show that the WLC receives LWAPP discovery requests from the APs and transmits a LWAPP discovery response to the APs. However, WLCs do not receive LWAPP join requests from the APs.
In order to troubleshoot this issue, ping the AP manager from a wired host on the same IP subnet as the AP manager. Then, check the ARP cache. If a duplicate IP address is found, remove the device with the duplicate IP address or change the IP address on the device so that it has a unique IP address on the network.
The AP can then join the WLC.
ā11-03-2013 11:52 PM
Thanks very much for your suggestion.
Unfortunately it does not help. All installed AP's joined the controller and do
have indivdual IP addresses.
I did not found any duplicate IP address in ARP cache.
MAC address tables in the switches do also not shown this MAC
4:ba:53:e0: 0: 0 or this MAC 4:b9:c8: 0: 0: 0 from the WLC log.
No AP does have this strange address 0.2.146.0
Nevertheless this logmessage comes up in the WLC every 3rd second.
Very strange... Maybe there must be 2 clients attached to the network which does have this address
0.2.146.0 which I cannot found or it is a controller bug.
ā11-14-2013 04:25 AM
Issue has been solved by restarting both affected AP's. Still unclear how this issue could happen.
ā12-05-2013 01:11 AM
i think your AP isn't completely progress until join into wlc. sometime we need to restart AP's or unplug cable if connect with PoE. i have similar issue with this a few month ago.
Regards,
Habibi
ā07-01-2022 05:00 AM
- FYI : https://bst.cloudapps.cisco.com/bugsearch/bug/CSCum06216
M.
ā11-15-2013 03:12 AM
However, the main reason is below
Error Message %LWAPP-3-DUP_AP_IP: Duplicate IP address detected for AP [chars], IP address of AP [chars], this is a duplicate of IP on another machine (MAC address [hex]:[hex]:[hex]:[hex]:[hex]:[hex])
Explanation A duplicate IP address has been detected for the specified AP.
Recommended Action Check the DHCP configuration and also change the IP address of the AP if it was configured statically.
ā07-01-2022 04:06 AM
Recommended Action:
Verify in the network if you have any devices which have the same IP address in the network.
Verify ARP entry from the core devices and see if you find two MACs for one IP.
Verify DHCP configuration & see if the same IP is reserved for any other devices.
Try to search the mac address on your core switch using sh mac address-table address [hex]:[hex]:[hex]:[hex]:[hex}:[hex]
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