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Moderator
sperez
Posts: 277
Registered: ‎07-29-2010
Accepted Solution

How do Instant APs work?

Hello

 

A customer of ours has asked us about the protocols behind Instant APs and their virtual controller technology.

 

I guess it works more or less like VRRP with no preemption and the same priority for all APs for the master AP election. For control traffic, i suppose it still uses PAPI tunnels but I would like to give our customer a more precise answer. Are there any tecnhnical notes addressing virtual controller technology?

 

Regards

 

Samuel

 

P.S. I've already seen the tech notes on the main webpage, but I'm afraid I need a bit more detail.

 

Samuel Pérez
ACMP, ACDX#100

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Moderator
sassy
Posts: 55
Registered: ‎10-14-2011

Re: How do Instant APs work?

The virtual controller or master is elected  using an election process that involves all IAPs in the group. If there is a contention, the IAP with the highest uptime will win.

There are no tunnels built for control traffic. The IAPs communicate using layer 2 broadcast and this is very lightweight.

 

There are additional details that can't be shared externally, but if there are specific questions or issues that the customer is concerned about, I will be happy to discuss those.

 

Thanks,

Shashi

Moderator
sperez
Posts: 277
Registered: ‎07-29-2010

Re: How do Instant APs work?

Hello

 

We've been capturing traffic in one of our customers network and have found out the following:

  • Control traffic (master AP election) between APs is done using PAPI (or at least it is UDP 8112) protocol.
  • The configuration is passed from the master AP to the rest via HTTP (plain text)

 

Samuel Pérez
ACMP, ACDX#100

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MVP
NightShade1
Posts: 2,382
Registered: ‎10-25-2011

Re: How do Instant APs work?

So the IAP works like the APs with the controller with bridge mode right?

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Product Manager - Aruba Networks
Alternetworks Corp