Controllerless Networks

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New Contributor
Posts: 2
Registered: ‎10-01-2014

Plannig Aruba controllerless

Hi, I'm plannig to deploy Aruba controllerless wifi and have some doubts:

 

1. What's the difference between Aruba Instant and Aruba cloud?

2. Which is the role of the master AP? Is there a master AP on Aruba Cloud?

3. What traffic goes to the master AP and to the Aruba Central?

4. What functions do i lost going migrating from a controller solution to controllerless?

 

Thanks

Guru Elite
Posts: 8,759
Registered: ‎09-08-2010

Re: Plannig Aruba controllerless

Instant can be used and managed stand-alone. Aruba Cloud represents Instant with Aruba Central which is a cloud based management platform (not required)

An AP is elected as the virtual controller. This is a physical me ever of the cluster.

Traffic that needs to be NATed, authentication requests, tunnel traffic and management go to the virtual controller.

Only management/monitoring data goes to Central (if you choose to use Central)

Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
New Contributor
Posts: 2
Registered: ‎10-01-2014

Re: Plannig Aruba controllerless

Thanks

1. So I have to buy Instant AP's and I can manage them with Aruba Central or standalone, isn't it?

2. Is there any document with more information about the traffic flows to the master AP (virtual controller) and its functions?

In fact, if we have a virtual controller it's not a real controllerless solution

Thanks

 

Guru Elite
Posts: 8,759
Registered: ‎09-08-2010

Re: Plannig Aruba controllerless

1) Instant APs are the same price as a campus AP. You can take them out of the box and use them without any management platform. Central can be added later.

 

2) There is no document regarding traffic flow. Most traffic is switched locally at the local AP where the user is connected.


Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Contributor I
Posts: 55
Registered: ‎09-05-2011

Re: Plannig Aruba controllerless

A couple of things I learnt working with IAPs (and might be useful for people who haven't used IAPs before):

 

If all the Instant access points are running the same InstantOS version, are in the same VLAN and auto joining has not be disabled then the following occurs:

 

  • An election for a master occurs.  The Instant access point that wins the election takes on the duties of a wireless LAN controller.  The Instant solution is called "controllerless" as a separate wireless LAN controller is not required but Javier is correct that Instant is not truely controllerless.  The master acts as the (virtual) wireless LAN controller for its cluster (Instant access points in the same VLAN) so if you have multiple sites with unique VLANs I am assuming you will have multiple Instant clusters.
  • The IAPs that are not elected the master synchronise their configurations with the master of their Instant cluster.

To access the Instant cluster you access the previously defined VIP and that automatically accesses the virtual controller.  In the event that the current virtual controller goes offline another election occurs and the new virtual controller takes over.  The Instant cluster can still be accessed using the same VIP.  So if you had three IAPs you need four IP addresses - one static for the VIP and three DHCP/static for the IAPs.  The VIP is defined in the IAP's configuration.

 

Therefore, you don't need Aruba Central to manage a small Instant deployment (just access the Instant cluster's VIP with a web browser) but if you have a number of Instant deployments (maybe offices in different cities) it allows you to monitor and manage your IAPs.

 

A new version of Aruba Central is expected late this year/early next year that will include a "highly configurable" external captive portal option.  This is important as the Instant internal captive portal does not resize due to the wireless client's screen size so is and issue with smartphones and other small screen devices.

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