WLC DHCP & VLAN issue

[alex.roth]

Hello,

I configured on my WLC 5508 a new Interface & VLAN . The WLC act as DHCP Proxy.

I enabled also Flex Connect local switching . Then I removed on my Switch under the

VLAN settings the IP helper because as I know the WLC act as  IP helper.

What is still not clear for me is where I have to insert the DHCP server adress

on my WLC controller. Must I insert the DHCP server IP under my management Interface

or where I have to enter the DHCP server IP.

I tested this with the new VLAN interface and added the DHCP server IP but without success.

Thanks for help.

Regards

[Scott Fella]

Well if your using FlexConnect with local switching then you need a dhcp server at the local site for the AP's to get an IP address.

If you using the WLC as a dhcp server, then in the interface you would put the management IP address for the primary dhcp server.

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[alex.roth]

Hi Scott,

Thanks for your replay. I ´ve configured the existing local  DHCP server with the new VLAN and I added the DHCP servers IP into the new WLC  interface DHCP entry but the clients don´t get an IP .

Regards

[Scott Fella]

If your using FlexConnect local switching, you need to use an external dhcp server.  The dhcp for the WLC is really if your doing central switching or your AP's are in local mode.  You can't use the local DHCP for FlexConnect local switching.

Thanks,

Scott

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[alex.roth]

I don´t use the WLC  as DHCP Server. I use a Windows Server as a DHCP server and added these IP under Controller/Interfaces  ( the new created VLAN interface ) and added as Primary DHCP server the Windows DHCP

server IP adress. But the WLAN clients don´t get an IP.

Thanks

[Stephen Rodriguez]

Do you have an ip helper-address configured under the L3 interface for the client subnets?  If you are doing FlexConnect Local Switching the local lan is going to send the DHCP request not the WLC.

HTH,
Steve

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[alex.roth]

Hi,

I addedd an IP helper under the L3 configuration without success. Same, WLAN clients don´t get an IP .

I configured following:

add a new VLAN into the switch with layer 3 and addedd IP helper on the L3 switch.

add the VLAN into the WLC controller wth a new SSID and Interface for this VLAN.

Enabled Flex Connect under the SSID.

Done a test with a wired client direct on a switch without problems.

If I try to connect over the WLAN then the client don´t get an IP.

Regards

[Stephen Rodriguez]

Did you go into the AP and FlexConnect and map the WLAN to the VLAN ID? and is the AP on a trunk port?

HTH,
Steve

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[alex.roth]

Yes, I configured the switchport as Trunk with native and allowed VLANs. Mapped also the WLAN to the VLAN ID ,. I´ve done the same for a new VoIP SSID without problems. The only differnce is for the VoIP network the DHCP server is direct located  on a VG Gateway in the same VLAN. For the other new network I used  our coporate DHCP server ( Superscope ) and added an IP helper on the L3 switch. But without success.

Thanks for help

[Stephen Rodriguez]

Can you share the FlexConnect configuration from one of the AP, as well as the switchport config that the AP is connected to? As well as a show vlan from the switch

HTH,
Steve

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[alex.roth]

Hi ,

Thanks . I  will check and let you know. Only problem is I need around 2 to do the next steps but I´ll you know about the results

Thx

[Scott Fella · Accepted solution]

Superscopes will give you problems.... Map the ssid to the same vlan as the voice ssid and see if the device gets an ip address.  This will eliminate the wireless configuration and will point to a network or dhcp issue.

Thanks,

Scott

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[dipumj]

Just wondering whether you tried disabling proxy as the wlc act as a relay agent.

George Dipu


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[Scott Fella · Accepted solution]

You need to get ride of the superscopes as they have caused issues with a few of my clients.  Clients that have a lease will not get a new ip address but will retain their own.

Thanks,

Scott

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[alex.roth]

Hi,

The problem was the Superscope. Our Serverguys created an own scope for the WLAN  subnet and then it works without problems.

Thanks all for help.

Alex