WX1200 and AP 3850 access points

heydude
heydude used Ask the Experts™
on
I'm new to the wireless controller setup, but we have the 3com wx1200 with 5 AP3850 access points wired to it. It says it is able to use 12. If I purchased 7 more ap3850 access points can I connect them to any POE enabled switch, or does it have to be a specific one? I'm figuring that I can add 7 more to the controller, even though it only has 6 ports?

Thank you!
Comment
Watch Question

Do more with

Expert Office
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®
Awarded 2009
Top Expert 2010

Commented:
It doesn't even have to be a POE switch, you can use power injectors if you need to.

It can support 12 devices either directly attached or connected via the network.
I have a WX4400 that doesn'[t have any DAP's they are all remote.

Commented:
They do have to either have a Layer 2 connection to the controller or be on the same VLAN.  If I remember there are a couple different ways to do it.  One is by handing out an extra option with DHCP that tells the AP what the address is for it's controller.
Awarded 2009
Top Expert 2010

Commented:
There is no need to do that and I have a WX4400 running 56 access points and have never configured this option.
Success in ‘20 With a Profitable Pricing Strategy

Do you wonder if your IT business is truly profitable or if you should raise your prices? Learn how to calculate your overhead burden using our free interactive tool and use it to determine the right price for your IT services. Start calculating Now!

If they're not connected directly to a controller they're called Distributed Managed Access Points (Distributed MAPs).


> ... can I connect them to any POE enabled switch,
> or does it have to be a specific one?

It can be any PoE switch as long as the switch doesn't block BOOTP (so the MAP can get its DHCP info)... if you're using VLANs you'll also want the switch to be dot 1q (802.1q) capable. Managed switches should have spanning tree disabled on the MAP's port or the MAP will have trouble booting up.

For extra layers of redundancy you can hardwire the MAP to 2 WX controllers (I think all of 3com's MAPs have dual ethernet ports), or to 1 WX and 1 PoE switch that connects to another WX (that would require a Distributed MAP configuration), or to 2 PoE switches connected to 2 WX controllers (also requires Distributed MAP setup, of course).


> I'm figuring that I can add 7 more to the controller,
> even though it only has 6 ports?

You can connect and configure up to 30 via more switches, but only 12 MAPs can be active simultaneously (the WX4400 ups that to 300 and 120, so the limit doesn't seem to be reflected in the model number). Most businesses do not require that level of redundancy... but if it means production halts when your WiFi goes down and you're paying 100+ people to stand around while people troubleshoot it, buying extra MAPs and an extra WX controller doesn't seem so expensive.  ;-)
If all it means is some people staying in a hotel have to plug in their laptops to an ethernet jack instead of using wifi for a couple hours, then that cost is harder to justify (though some customers might argue that point - risk management and cost:benefit have to figure in there somewhere)... especially when most of them might not even notice one MAP or segment is down.

Commented:
Yes, likely because they are on the same subnet.  If they are on a different subnet you would need to use this option.

As mentioned you can do it a number of different ways.  If you have a Layer 2 connection you are good to go.

Congratulations on your WX4400 and 56 access points.
> It doesn't even have to be a POE switch, you
> can use power injectors if you need to.

Ahhh... that's true, but it usually costs more to buy a switch plus injectors than just get the switch with PoE ports to begin with. If you only need 1 more port though, that may be the way to go.

I think it's option 43 in DHCP to which jfrady was referring. It's only required if the distributed MAP is more than 1 layer-3 switch away from the WX controller.

Awarded 2009
Top Expert 2010
Commented:
"but it usually costs more to buy a switch plus injectors than just get the switch with PoE"

Depends if you have just purchased a load of brand new 5500G switches without PoE and then management decide they now want complete coverage WIFI.

If your only putting 1 DAP per switch cab than $30 for an injector as apposed to $500 for the PoE upgrade for all your edge switches.

I know where I would be going :-)
My WX4400 and MAP3850 can not establish a connection.

I have attached a 3Com 8 port Gigabit Switch then a TP-Link 4 port PoE Switch to connect AP3850.

Do more with

Expert Office
Submit tech questions to Ask the Experts™ at any time to receive solutions, advice, and new ideas from leading industry professionals.

Start 7-Day Free Trial