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New Member

Wireless clients Roaming

Hi every body!

I´m implementing a wireless network an our client wants the works in this way.

One SSID on al building floors but Each floor with his own subnet

He wants to have roaming in al building floors.

The questions is. A client associated to an AP on floor "A" and it moving to a floor "B" cant it preserve the IP address af floor a and connect to an AP in the floor "B" (make a roaming), with out loss connection?

The APs are in controller mode and the version ins 7.0.116

Thanks in advance.

7 REPLIES
Hall of Fame Super Gold

Wireless clients Roaming

The questions is. A client associated to an AP on floor "A" and it moving to a floor "B" cant it preserve the IP address af floor a and connect to an AP in the floor "B" (make a roaming), with out loss connection?

Define inter-floor "roaming".  What client are you talking about?  How do you go from one floor to another?  Is there wireless signal in the elevator or in the stairwell?

New Member

Wireless clients Roaming

Hi leolaohoo,

The clients are Lap-Top(s), Ipad, Smart Phones

The user wil goin from floor A to floor B using stairwell

Yes, we have APs over the stairwell to cover these area

The APs are all on H-REAP mode an we are using vlan mapping to match the vlan with the SSID on each floor.

The customer wants to have just one SSID and different subnets on each floor.

We have just only one controller.

best regards

New Member

Wireless clients Roaming

Is there a real requirement to have each floor on its own subnet (specifically for the wireless network) ?  This question is pertinent because there is the potential to simplify roaming, maintaining connectivity, and preserving the same IP address - this is also known as L2 Roaming.

Essentially, you would perform the following:

  • Define an SSID for your access point(s)
  • Map the SSID to a VLAN
    • Clients are completely unaware/abstracted from the SSID being mapped to a VLAN
    • Allows multiple SSIDs to be broadcasted from the AP as long as each is mapped to a specific VLAN
  • Configure ethernet interface on AP for dot1q encapsulation
    • Enables multiple VLANs to traverse the link between the AP & Switch
  • Configure interface(s) connected to access point for dot1q encapsulation
  • Configure interface(s) between switches for dot1q encapsulation
  • Create VLAN (specified by step 2) on each switch (or use VTP)
  • Happy roaming

Roaming is always initiated by client; it will monitor the received signal strength and when it encounters another access point with the same SSID (different BSSID) with better signal, it will deassociate with the 1st SSID and associate with the second access point.  If your wireless environment is configured as indicated above, the client will maintain its IP address (along with all its bindings) will be preserved (applications will continue to work and are unaffected from roaming - seamless roaming.

However, if the business requirements stipulate true L3 roaming ,here is a link to a post made that has poses a similar inquiry.

Discussion:

https://supportforums.cisco.com/thread/334412

Documentation:

http://www.cisco.com/en/US/docs/wireless/controller/4.2/configuration/guide/c42mobil.html

Let me know if this helps!

New Member

Wireless clients Roaming

Hi Mattehw, the stage you comment was the first optino, but our customer don´t like the idea of "many" SSID.

I read the linked document, but I have just only one controller, Is possible to use the Anchor feature with just one controller over one Mobility group?.

Thanks in advance.

New Member

Wireless clients Roaming

The same SSID is mapped to each access point and from the client's perspective, they only see a single SSID broadcasted. 

What specifically are the requirements from the customer?

For example, here is a wireless network that is spread across multiple locations that are using same SSID:

Command executed on Windows 7 machien: netsh wlan show networks mode=bssid

SSID 1 : blizzard

    Network type            : Infrastructure

    Authentication          : WPA2-Enterprise

    Encryption              : CCMP

    BSSID 1                 : 88:f0:77:ad:30:6f

         Signal             : 99%

         Radio type         : 802.11n

         Channel            : 149

         Basic rates (Mbps) : 12

         Other rates (Mbps) : 18 24 36 48 54

    BSSID 2                 : 88:f0:77:ad:59:6f

         Signal             : 45%

         Radio type         : 802.11n

         Channel            : 153

         Basic rates (Mbps) : 12

         Other rates (Mbps) : 18 24 36 48 54

    BSSID 3                 : 88:f0:77:f2:6e:5f

         Signal             : 45%

         Radio type         : 802.11n

         Channel            : 36

         Basic rates (Mbps) : 12

         Other rates (Mbps) : 18 24 36 48 54

    BSSID 4                 : 88:f0:77:f2:73:2f

However, the laptop only sees a single SSID despite multiple APs broadcasting :

Cisco Employee

Wireless clients Roaming

In controlelr based deployments L3 roaming is possible where you can maintain the ip address of the wireless client

Hall of Fame Super Silver

Re: Wireless clients Roaming

You mentioned the APs are in h-reap. So hen a user roams from floor A to floor B and the SSID is mapped to

A differet vlan in each floor, roaming will break. If you want that to work, you need to either put the APs in local mode or centrally switch the WLAN. That would mean that each floor vlan would have to reside on the location the wlc is located. There is no other way to get that to work.

Sent from Cisco Technical Support iPhone App

Sent from Cisco Technical Support iPhone App

-Scott
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