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always connect to a particular AP so that they don't roam to nearby units?


I work at a school. We are using an Extreme C35 controller. We have carts of laptops in classrooms next to each other. Is there a way to force the laptops to always connect to a particular AP so that they don't roam to nearby units?

11 replies

Userlevel 7
Could you explain the scenario in more detail...

So the devices of cart#1 are always in room#1 and cart#2 in room#2 ?

How many carts/rooms are we talking about.
For instance, in grades 3-4, each classroom will have their own cart of 25-30 laptops. When we start having connection issues, we often see that the laptop has connected to an AP of an adjoining room or a room down the hall instead of the one that is in the same room. We are looking for a way to have that cart of laptops always connect to the AP in its room. Maybe 8 carts per building.
Ideally, we want to do this from the Wireless Controller in a way that it can be changed as needed. (In example.. a cart is loaned to a different classroom.)
Userlevel 4
Depending on how many APs you have in your environment you could try decreasing the cell size so that clients cannot connect from an adjoining room.

Alternatively you could consider using load groups and limiting the number of connections per radio per AP?

Hope this helps.

- Sam
We have run the calibration on the wireless network. This helped some. The problem is that these are small classrooms and there are glass windows at the top of the wall of the room. So there is a lot of signal leakage from one room to the next. I don't know that the connection limit would help as the laptops are seldom used and it's likely that the AP's will always be under any limit set.
Userlevel 7
You'd setup one SSID/WLAN service per cart that you only advertise on the AP in that room.

All could share the same topology/role = subnet/VLAN.

If you'd like to move cart#1 to AP-room#3 you'd need just to enable the SSID cart#1 on that AP.

Can't think about any other solution.
Userlevel 7
Ron wrote:

You'd setup one SSID/WLAN service per cart that you only advertise on the AP in that room.

All could share the same topology/role = subnet/VLAN.

If you'd like to move cart#1 to AP-room#3 you'd need just to enable the SSID cart#1 on that AP.

Can't think about any other solution.

the c35 supports up to 16 active VNSs as per v10.11 GSG
Userlevel 7
Ron wrote:

You'd setup one SSID/WLAN service per cart that you only advertise on the AP in that room.

All could share the same topology/role = subnet/VLAN.

If you'd like to move cart#1 to AP-room#3 you'd need just to enable the SSID cart#1 on that AP.

Can't think about any other solution.

Assuming these carts always stay in the same room, this would be the most reliable way to ensure that they only connect to the AP you want them to connect to.
Ron wrote:

You'd setup one SSID/WLAN service per cart that you only advertise on the AP in that room.

All could share the same topology/role = subnet/VLAN.

If you'd like to move cart#1 to AP-room#3 you'd need just to enable the SSID cart#1 on that AP.

Can't think about any other solution.

I agree. That looks like the best route. Thank you all for all of your help.
Userlevel 7
Could be that you'd also do it with less SSIDs - here a example if you've one AP / room.
The signal should be low enough so clients don't connect to a AP/room far away.

We are looking at possibly 6 SSIDs. That would allow us to have unique connections for each room in a hallway. We can use the same SSIDs in other halls as they are physically far enough apart that they shouldn't cause a problem.

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