WLC seperated by L3 from an SVI

[Mr.poison]

Greetings!

I have a scenario where is a group of wired and wireless devices are meant to be on one LAN (single Subnet). the gateway is created on one Core Switch (SVI). but when it came to do the wireless part I couldn't do much since the WLC was connected to a different L3 Switch and both switches were separate by L3 subnet. The scenario is illustrated below diagram. Can you please advise what is the solution followed here for such requirements ?

[Scott Fella]

You need to do FlexConnect local switching. The AP's would place traffic on the switch it is connected to and not tunneled back to the controller. Here is a link that will help:

http://www.cisco.com/c/en/us/td/docs/wireless/controller/7-2/configuration/guide/cg/cg_flexconnect.html

https://supportforums.cisco.com/document/98646/wireless-lan-flexconnect-configuration-example

-Scott 

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[Mr.poison]

Can you please elaborate on the purpose of having the native VLAN on the trunk which connects the AP?

[Manish Mathur]

Basically , whichever VLAN you want your AP to get an IP from should be the native VLAN on the AP uplink trunk port. For example, if you wish that your APs should fetch an IP from VLAN 12 , this vlan should be the native vlan on the trunk port and all the other vlans (mapped to ssids) should be allowed.

Reason: When the AP boots up and sends a DHCP discover , the discover packet will be untagged and thus will be sent to the native vlan on the switchport. Thus, this native vlan will be responsible to get an IP address for the AP.

Hope this helps.

Manish

[Mr.poison]

Hi Manish;

I am assinging mapping of VLAN to WLAN per AP. meaning i have to do it one AP at a time.

Is there an efficient way to do it ? I have all AP which needs such mapping in one AP group.

Is there an option where I can do this mapping per WLAN profile rather that using AP-Specific mapping ?

[Manish Mathur · Accepted solution]

Hi Poison (is that you real name BTW ?  :) )

Since, all of these Aps are in Flexconnect mode , you need to create a Flexconnect group and add these APs to the group.

You can do this by navigating to Wireless >> Flexconnect Group >> Create new

Now, if you click on the Flexconnect Group name, you will see a tab like "WLAN VLAN mapping". Here you need to map the WLAN ID to VLAN ID. WLAN ID can be seen on the WLANs tab on the WLC GUI or on the CLI "show wlan summary".

BTW, what is the version of the code that you are using on the WLC ?

Thanks,

Manish

[Scott Fella]

Just to add.  You can create a CLI script to make these changes, you can do what Manish mentioned, or another way is to create a bogus interface for that vlan and in the WLAN, map the WLAN to that bogus interface. This will populate the WLAN to VLAN mapping for FlexConnect AP's.  Now this doesn't have to be a bogus interface if you plan on mapping a WLAN to that interface. 

-Scott

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[Manish Mathur]

I agree with Scott. It looks to be the case where the APs and the WLC are on different subnets (across layer 3). If you have already made the Aps join the WLC by using any of the joining mechanisms like DHCP option 43/DNS resolution/CAPWAP UDP forwarding , the next step wuld be to change the AP mode to Flexconnect >> Configure all the AP uplink ports as trunk ports allowing all the client VLANs on these ports >> Enable Flexconnect local switching on all the WLANs advanced tab >> create a Flexconnect group on the WLC with all of these APs in this group >> configure the WLAN-VLAN mapping under this Flex group.

I may have missed a point or two which can be found in the links provided by Scott.

Cheers,

Manish

[Scott Fella · Accepted solution]

He is an old post that has an excel spreadsheet to help with CLI commands you can just paste onto the controller.  Just scroll down until you see the file unless this opens up the zip.

https://supportforums.cisco.com/sites/default/files/legacy/9/3/8/15361839-Example%20of%20the%20text%20file.txt.zip

Thread:

https://supportforums.cisco.com/discussion/11837926/lost-vlan-mapping-wlc-5508-flexconnect

-Scott

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[Mr.poison]

thank you manish and scott .. great help! i have achieved my goal design and learned something new.

[Scott Fella]

Glad to help and good luck.

-Scott 

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