Due to the end of sale of AP6521 I am now encountering the situation where customers require additional access points. The scenario is AP6521 with Virtual Controller installed in a warehouse and now needs some additional access points. If I propose AP7522 with Virtual Controller will there be roaming problems when devices roam across the two models? devices will be running Wavelink TelnetCE. Any thoughts appreciated, Regards Steve
Wi-Fi roam-assist mechanisms such as 802.11k, r and v are usually implemented in the controller software and as the virtual controllers won't be aware of the other APs, these mechanisms won't operate.
Have you considered implementing a Wireless LAN Controller (e.g. RFS4000) that can adopt both the older and new APs to remedy this situation?
Hope that helps.
How Many Access Points 6521 Do You Use?
And how many Aps7522 will you add?
The Wavelink Telnet emulator is very sensitive to roaming and can suffer a disconnection so I understand your concern.
What HanHeld uses Zebra MC9000 or Intermec??
I recommend using a Telnet session manager that will help you not to suffer disconnections in Telnet clients.
If you are installing the new APs (AP7522) behind a routed switch, then for seamless roaming to be achieved, a controller (RFS4000, NX5500, VX9xxx) is needed as mentioned above; however, if these new APs are going to be in the same broadcast domain as the AP6521s, then seamless roaming (required for telnet) is possible without the need of a fully fledged controller. It is important to note that 2 virtual controllers in the same broadcast domain is not recommended and not supported. Here are some recommendations:
1 - All APs should be on the same firmware version
2 - All APs should be in the same broadcast domain
3 - Leave the AP6521 configure as VC, but add the AP7522 as Standalone APs not adopted by a VC (for now).
4 - Disable MCLP VLAN on the AP7522s
In the upcoming firmware release, heterogeneous VC support should be included. The AP7522 should be able to adopt different models not in the same family. It's not clear if the AP6521 will be included in the list, but we'll know more once the firmware is released.
In short, seamless roaming can be achieved in the following cases:
APs not in same broadcast domain >> full controller
APs in the same broadcast domain >> VC for AP6521 and no VC for AP7522