Controller Assisted Mobility

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Seeking any feedback on the "Controller Assisted Mobility" feature which can be enabled on WLAN>Client Settings.
I have a older Distribution Center site running 2 RFS7000s. Site has 3 buildings assigned to their own unique RF Domains. Building 1 has 60 AP621s, Building 3 has 30 AP621s and Building 3 has 20 AP6522s. All APs are configured for IPLayer3/MintLevel1 adoption. The main WLAN is tunnelled back to the controller and configured with a VLAN pool of 4 VLANs. Problems occur when forklifts move between RF domains, and on recent rare occasions MU disassociations result in MUs being assigned to a new VLAN. I've seen the following webpage https://gtacknowledge.extremenetworks.com/articles/Solution/Laptop-MU-Roaming-issue-Between-RF-Domai... which recommends implementing Controller Assisted Mobility for these issues, but when implemented I can't see any difference in the GUI or way of confirming if a roaming database is being maintained by the controller. any feedback would be appreciated, thanks.
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Gary Hartstone

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Posted 1 year ago

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Robert Zarzycki, Employee

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Hi, Gary can you share with us the firmware version your running, please.  
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Gary Hartstone

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Running an older firmware version 5.5.6.0-019R
Don't have many opportunities do do any upgrades at this site, and everything has been running smoothly up till now.Have confirmed that Controller Assisited Mobility can be enabled from the GUI.
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Ondrej Lepa, Employee

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HI Gary,

what controller assisted mobility does is actually a database of clients and their vlan / wlan assignation.
That helps controller and APs to effectively share information across RF-Domains, which are borders of WNMP updates.

You can check your mobility database using below command and see if populated correctly
show wireless mobility-database


Let us know if you have any concerns about that.

Regards,
Ondrej
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Gary Hartstone

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Thanks for the feedback. I wasn't sure how to view the mobility database.
How long are details stored in this database to enable smooth roaming?
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Ondrej Lepa, Employee

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Hi Gary,

I believe this is until the client "decay" occurs.
 
Basically once there is traffic seen from the MAC it is on, then there is inactivity-timeout to be measured and then the client is gone.



Regards,
Ondrej
(Edited)
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Shay Weir

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Is there a reason why you have 3 rf-domains for this location?  Why not a single domain, 3 WLANs, use the extended vlan parameter in the controller profile?  Each WLAN can have its own VLAN\DHCP scope, security settings, device specific settings, data rates.  We have several large fulfillment centers (3million square feet) using this configuration.  The clients range from tablets, to lifts, to wearable, handhelds and wireless printers.  This design works well.  All traffic is tunneled back to the controller to allow for roaming between areas.  Just a thought for a simple configuration.
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Gary Hartstone

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Thanks for the feedback. At the time we were moving from L2 to L3 adoption and migrating from multiple RFS6000s. With the memory limitations of the AP621s it seemed easier to have each building have their own RF Domain.
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Shay Weir

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Makes sense.  We moved from Cisco 1200's (and 5508 controllers) to ap7532 and ap7562 (nx7510 WiNG controllers) for several facilities.  Each facility has about 200 APs.  We started using the 8132 initially because of their industrial look and feel, but found out the ap7532 (which came out mid conversion) works just as well if not better and offered 802.11ac.  Extreme has some newer models in the works that have more features to support these environments.  Talk to your rep about what is coming up.  You may be surprised.
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Andy Holden, Employee

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Hi - Reading the description on your wireless network, it seams closer to a CAMPUS deployment rather than a DISTRUBUTED one. The difference is that in a CAMPUS deployment there will be a single RF-Domain, but the AP are grouped to their assigned buildings by assigning them to AREAS/FLOOR. This option is listed in the AP's override. It will preserve the current SMART-RF settings and my improve your roaming. Use the ON-Line help for a full description of these features
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Shay Weir

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The Smart-RF policy that manages this does not work.  It is fixed though in WiNG 5.9.  We tried the by floor, by area and Smart-RF did not do the proper calculation.  Wait for 5.9.  I would still enter the information into the device\AP level profile so that you have this in place for future use.
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Alona, Employee

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It works in 5.5.6. It was broken much later
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Andy Holden, Employee

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Hi Shay - 5.9.0 is now available on the support site.

Before implementing, review the release notes for supported devices

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Shay Weir

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Thanks Andy!  Chris F. sent us the release notes yesterday.  We needed the by floor and\or area features about 6 months ago.  We will take another run at it once we decide when to upgrade.  May wait for 5.9.2 :)
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Alona, Employee

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You have RFS7000 and AP 621 - both out of support. You should really plan for infrastructure replacement. You wont't be able to upgrade to 5.9 or any other release at this point.