07-21-2022 07:49 PM
Team,
*****Urgent Issue....Need some quick feedback to troubleshoot**************
I am actively troubleshooting Catalyst 9800-80 (FW: 17.7.1) failing to send CAPWAP discovery response to C9120AX-B(FW Version: 17.8.0.102) having issue.
Subnet both AP & WLC: 96.97.72.128/29
Same management VLAN
Steps applied on AP to discover WLC:
1. statically assigned primary WLC IP address (96.97.72.130)
2. Also DHCP Option43 configured on WLC.
But AP is not able to join WLC and I see this error "Discovery Request sent to 255.255.255.255, discovery type UNKNOWN(0)"
I have attached different logs, show run & other info, please review & let me know the troubleshooting steps....Thanks in advance.
07-21-2022 07:58 PM
Did you configured DHCP correctly in AP network? AP should get IP from DHCP or you can assign static IP to AP in same ip range.
07-21-2022 08:02 PM
I have assign static IP using before command
capwap ap primary-base WLC Name WLC IP Add
07-22-2022 09:14 PM
that is for mapping of WLC. check you have valid IP assigned to Access point via static IP config or DHCP
07-21-2022 08:26 PM
Downgrade to either 17.3.5 or 17.6.3.
07-21-2022 08:28 PM
Do you think this is bug associated with WLC FW 17.7.1 ?
07-21-2022 09:14 PM
@azeezmohammed wrote:
Do you think this is bug associated with WLC FW 17.7.1 ?
Downgrade to 17.3.5 or 17.6.3 and see if the AP joins the WLC.
If it is, then try upgrading to 17.8.X and try again. If the AP refuses to join the WLC, then contact TAC.
07-21-2022 09:21 PM
07-21-2022 09:39 PM
@azeezmohammed wrote:
capwap ap primary-base WLC Name WLC IP Add
What is the WLC's IP address?
07-21-2022 09:40 PM
96.97.72.130
07-21-2022 11:44 PM
- Review the 9800-80 configuration with the CLI command : show tech wireless , have the output analyzed by https://cway.cisco.com/
M.
07-22-2022 06:30 AM
Check your WLC config as @marce1000 says.
Then check DHCP as @Kasun Bandara says. You said "I have assign static IP using before command" but that command is to configure the WLC details *not* the AP interface IP. The AP needs an IP address before it can do anything - either from DHCP or static config.
Logs showing deep green mode - see https://community.cisco.com/t5/wireless/cisco-ap-9120-in-deep-green-mode-no-ip-from-dhcp/td-p/4576897 - in that case user had forgotten to configure 802.1q on the switch port. Basically this is telling you that the AP cannot get DHCP so solve that by checking switchport, VLAN and DHCP server config.
07-25-2022 12:39 PM
@marce1000 , @Kasun Bandara , @Rich R & @Leo Laohoo
Do we have a CLI command to change date & time on Cisco C9120AXI-B AP?
Currently I see C9120AXI-B & Cisco 9800-80 time is mismatch.
07-25-2022 10:04 PM
@azeezmohammed no need to set time on AP. That is done by the discovery response from the WLC which contains a CAPWAP time sync field like the one below from a packet capture. Refer back to the advice given already above - sort out the basics:
Type: (t=37,l=11) Vendor Specific Payload: Cisco AP Time Sync
Type: Vendor Specific Payload (37)
Length: 11
Value: 0040960000975ee9376401
Vendor Identifier: Unknown (4232704)
Vendor Element ID: 151
Vendor Data: 5ee9376401
Cisco Element ID: AP Time Sync (151)
Cisco Value: 5ee9376401
AP TimeSync: Jun 16, 2020 22:19:32.000000000 GMT Summer Time
Type (?): 1
07-30-2022 08:15 PM
I was able to fix this issue....WLC was missing wireless management interface and once I configured that AP was able to discover the WLC.
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