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Cisco Wireless LAN Controller

By yuemo ·

We'd like to try Cisco Wireless LAN Controllers. It is said that the controller can controll and manage access points via Layer 3.

So I am wondering any concerns on the performance if the controller and Access points are on different physical locations. The connection will be high speed, 10MB.

If anyone has some field experiece and likes to share, I really appreciate it.



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by mshavrov In reply to Cisco Wireless LAN Contro ...

It all depends on number of wireless users and traffic pattern. If your users access servers on your central location, wireless traffic will be not different than any other workstation traffic. The only difference is in how WLC communicates with APs. When you have WLC and APs in LightWeight mode, then all traffic from AP goes encrypted to the WLC, and then WLC does security stuff, marks VLAN tags, and sends it to the local LAN. So, if majority of your traffic at remote location goes to your central location, then it's the same as if you just add a couple more PCs. However, if your remote location has more local traffic, then you will duplicate your traffic on the 10 Mbps link (your traffic will go from AP to WLC, and then back from WLC to remote location.

In addition, speaking about "Layer 3 communication". This is more about "discovery mechanism". When you have APs and WLC connected to the same switch, AP sends a broadcast, WLC sees it, and talks back to AP. When you have Layer 3 between AP and WLC, you have to either configure AP manually (initial configuration on some models), or you have to modify your DHCP scope to tell AP, where is your WLC. After that it does not matter if it's L2 or L3 communication.

Good luck,

CCNP, CCDP, CCSP, Security+, MCSE W2K, MCSE+I, etc.

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