Wireless Mobility Configuration

[Vikas Gundu]

Hello Team,

Need your help asap...

Customer has 2 WLC(2112) in their network.

WLC1: 10.169.90.29/24 (mgmt interface)
WLC2: 10.169.95.29/24 (mgmt interface)

8 AP are registered to WLC1 and 8 ap are registered to WLC2

Customer needs a seemless mobility when the user moves from AP1 (registered to WLC1) to AP2 (registered to WLC2)

As the mgmt interface is in different subnet is it possible to have a seeemless mobility????

 and there is no HA configured for both the WLCs.

So is it possible to have a seemless mobility by using anchor/foreign controller concept??

and pls let me know what all configuration that need to be done on both the controllers.

Also let me know what will be the WLAN interface configured on both the controller.

Pls let me know if you need any more details.

Customer needs the solution by today itself...

Thanks in advance...

[Stephen Rodriguez]

the answer is yes you can have seamless roaming between the WLC....and it depends.

The WLC mgmt interface doesn't matter to the client. So long as the two WLC are in the same mobility group you should roam just fine.

If both WLC have the same interface then the client would do a layer 2 roam. The MSCb entry would be moved from the first WLC to the second one when the client roams between the AP.

If you have different interfaces on the WLC, then the client would do a layer 3 roam. With a Layer 3 roam, the client traffic will be anchored to the original WLC.

take a look at this as well:

http://www.cisco.com/c/en/us/td/docs/wireless/controller/4-2/configuration/guide/ccfig42/c42mobil.html

HTH,

Steve

[Vikas Gundu]

Thanks Steve,

thanks for your reply...

Will try and revert you back if at all I face any issues.

[Anand Thakur]

Hi,

Please let me know if we have a single controller Cisco WLC 2504 and 2 different VLANs configured for same SSID, will the clients be able to roam between the floors (which are separate VLANs).

It is on if they do not retain their original IP address?

Scenario:

We have a single Cisco 2504 WLC with a single local SSID e.g. msc-emp. There are two floors in the office and we have two different subnets configured for WLAN access to both the floors, 172.16.28.0/24 & 172.16.29.0/24. The LWAPs are configured in Flex-Connect mode and use VLAN mapping for assigning the IP addresses differently to respective floor users. There is Layer 3 ehther-channel running between the floors.

The problem occurs when the users roam between the floors and need to manually disconnect and reconnect to the same SSID, but different subnet. Can we configure the WLC or SSID to allow the users to roam with out disconnecting and reconnecting between the floors?

Please let me know if any further details are required from my side.

Thanks in advance for the prompt reply.

Regards,

Anand

[Rasika Nayanajith]

Adding to Steve, you have to have same virtual interface IP in all controllers if you want to have seamless roaming. Here is a reference for a summary of different roaming scenarios

http://mrncciew.com/2013/03/16/wireless-mobility-basics/

Configuration wise below posts should help you.

http://mrncciew.com/2013/03/16/configuring-mobility-on-wlc/

http://mrncciew.com/2013/05/20/mobility-config-via-cli/

HTH

Rasika

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[Vikas Gundu]

Thanks Rasika...

As I'm not from wireless pls correct me if I am wrong..

Ill do the following configuration on the Controllers:

WLC1(10.169.90.29): I will create a domain XYZ and add WLC2 into it.

WLC2(10.169.95.29): I will create a domain XYZ and add WLC1 into it.

Commands:

WLC1> config mobility group domain XYZ

WLC1>config mobility group member add <mac addr> <10.169.95.29> XYZ

WLC1> config mobility multicast-mode enable <multicast ip> (optional)

WLC2> config mobility group domain XYZ

WLC2>config mobility group member add <mac addr> <10.169.90.29> XYZ

WLC2> config mobility multicast-mode enable <multicast ip> ((optional)

But how do I configure anchor controller.??

Now moving on SSID:

SSID on WLC1 is NMXZR mapped to vlan 109 with ip 10.169.109.2

SSID on WLC2 is NMXZR mapped to vlan 108 with ip 10.169.108.2

do i need to make both the WLan as anchor.??

Rply asap...

thanks in advance

[Rasika Nayanajith]

Hi,

Just go with unicast in your case as only two WLC in the mobility group. You do not want to configure Anchor, Foreign unless it is for a geust SSID where you want to terminate traffic at one particular controller. In normal roaming scenario, when a client first associate to AP, the WLC managed that AP become anchor & when clinet roamed to another AP managed by different controller, that become foreign.

To do that below should be sufficient.

WLC1> config mobility group domain XYZ

WLC1>config mobility group member add <WLC2_mac addr> <10.169.95.29> XYZ

WLC2> config mobility group domain XYZ

WLC2>config mobility group member add <WLC1_mac addr> <10.169.90.29> XYZ

Post "show mobility summary" output & "show interface summary" output once you configured the above in both controllers.

HTH

Rasika

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[Vikas Gundu]

thanks rashika....

Will try and revert you back if at all I face any issues.

[Vikas Gundu]

Hello Rashika,

We are facing the problem...

Both the controller has same ios and everything is configured well as you said but still it is showing local on both the controller.

Ip addr is maintained by user is unable to connect to the internet..

[Rasika Nayanajith]

Hi Vikas,

Pls attache below command outputs from both controllers

1. show mobility summary

2. show interface summary

3. show wlan summary

HTH

Rasika

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[Vikas Gundu]

Pls find the attched logs

[Rasika Nayanajith · Accepted solution]

Have you enabled multicast on your WLC management vlan across your switch network ? Since you have enabled multicast mode for mobility you need to make sure multicast is configured properly in your network to mobility to work.

Otherwise simply use unicast method & test it. You can disable it like below

(WLC) >config mobility multicast-mode disable 

(WLC) >config mobility group multicast-address DGP_RF 0.0.0.0

HTH

Rasika

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