DHCP client wont get ip from C9800 LC

[AliDoskii]

Hello Cisco Community,

Hope everyone is well.

Recently i am facing difficulty with implementing my wireless network.
i have installed wireless access point and all of them successfully appearing in my wireless controller dashboard, WLAN created for them and SSID is working fine, i could see and connect to my SSID without problem.

The only problem that i have is, my wireless client cannot get ip address from DHCP.

I have made VLAN 50 to be relay as well but still no chance, whereas access point is getting ip address from DHCP without any problem.

can someone please help me with that?
Thanks in advance,
AliDoski

[marce1000]

 - Start with a checkup of the C9800 configuration using the CLI command show  tech wireless and feed the output from
    that into Wireless Config Analyzer
                             (do not use a simple show tech as input for WirelessAnalyzer ; use the full command in green)

   - Further engage in full client debugging according to https://logadvisor.cisco.com/logadvisor/wireless/9800/9800ClientConnectivity , these debugs can be analyzed with Wireless Debug Analyzer

  -  - Outputs from the commands mentioned in https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/217738-monitor-catalyst-9800-kpis-key-performa.html#anc5 can also be useful , especially when changes are made to the configuration

 - Use this architecture for DHCP https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/technical-reference/c9800-best-practices.html#DHCPbridgingandDHCPrelay

 - Look into the controller software version , go for 17.12.3 , especially if you are currently on an older version , 

 M.

[Flavio Miranda]

@AliDoskii 

Assuming you using Local mode and not flexconnect. Can you ping the WLC IP address on vlan 50 from the DHCP server?

Or, can you ping the DHCP server from the WLC?

[AliDoskii]

@Flavio Miranda 
DHCP server is same as default gateway, yes i could ping without issue.
and yes, all my APs are operating in local mode as shown.

AP are getting IP from DHCP with no issue:

[Flavio Miranda]

Wlan is mapped to vlan 50 on WLC?

[AliDoskii]

How can i verify this?

[Flavio Miranda]

show wlan summary

[AliDoskii]

Here is my WLAN config :
WLC(config-wlan)#do show run wlan
!
aaa attribute list wlan_lobby_access
policy-map AutoQos-4.0-wlan-Port-Output-Policy
class AutoQos-4.0-Output-CAPWAP-C-Class
priority level 1
class AutoQos-4.0-Output-Voice-Class
priority level 2
class class-default
service-policy output AutoQos-4.0-wlan-Port-Output-Policy
service-policy output AutoQos-4.0-wlan-Port-Output-Policy
service-policy output AutoQos-4.0-wlan-Port-Output-Policy
service-policy output AutoQos-4.0-wlan-Port-Output-Policy
service-policy output AutoQos-4.0-wlan-Port-Output-Policy
wlan Radisson policy Radisson
wlan Radisson 1 Radisson-Starlink
security wpa psk set-key ascii 0 ciscocisco
no security wpa akm dot1x
security wpa akm psk
security pmf optional
no shutdown
!

[Flavio Miranda]

I was expecting a different output from this command.  Take a look on this video and make sure you went through all the steps. On this video the dude show how to map WLAN to VLAN and setup DHCP server on the WLAN.

https://www.youtube.com/watch?v=5FpYS_rphik

[AliDoskii]

i believe i made a mistake at the initial config of my controller in policy section of WLAN creation i chose default VLAN instead of VLAN 50.

[Flavio Miranda]

That might be something like this. The WLC is not placing the DHCP request on the right vlan. Check the DHCP server is rihgt configured on the WLAN also.

[AliDoskii]

I have changed WLAN VLAN to 50 as previously was default 1.
and  i have configured server DHCP in policy and put my server DHCP 10.10.50.1 and removed ip helper address under vlan 50 as they are all in some subnet.

but still my wireless users cannot get ip address from dhcp.

[marce1000]

 - May  I still remind you to execute the WirelessAnalyzer procedure when making configuration changes on the controller :
   using the CLI command show  tech wireless and feed the output from
    that into Wireless Config Analyzer
                             (do not use a simple show tech as input for WirelessAnalyzer ; use the full command in green)

   Consider mandatory after configuring has been done !!

 M.

[AliDoskii]

sorry i missed first comment.
here is tech support file attached

[marce1000]

   - I found no fundamental errors in WLCRESULTS.xlsx , you should debug a client which gets no ip address :
    according to https://logadvisor.cisco.com/logadvisor/wireless/9800/9800ClientConnectivity , these debugs can then be analyzed with Wireless Debug Analyzer

  M.