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Occasional Contributor II

Master controller scalability

We have read that in an all-master model consisting of two master controllers, the backup master cannot terminate any APs. Additionally the active master controller may face scalability limits when it terminates a large number of APs. We are deploying two 7220 controllers and due to licensing reasons, we will need to use the centralized liensing server feature. In order to have backup for the licenscing server, we are leaning towards deploying the controllers in an all-master model, where we will also have a backup licesencing server. Only a master controller can be a licensing server. We have approximately 800 APs, and the 7220 supports 1024. Should we be concerned for potential scale issues if all 800 APs are terminated on the active master controller? Note that in our deployment, no PEF-NG licensing is used, so the controller will not be performing any stateful firewall functions.
Guru Elite

Re: Master controller scalability

 


nbenis wrote:
We have read that in an all-master model consisting of two master controllers, the backup master cannot terminate any APs. 

 

Where did you read that?

 



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Re: Master controller scalability

If a controller is in the 'backup-master' or 'backup' role, it will not terminate any APs. Once it's role changes to 'Master' (assuming the primary master failed), then it will begin terminating APs. 

 

If you have two separate standalone master controllers, where they are both in the 'master' role and you are terminating APs on both and manually syncing the config (or using AirWave), then both masters would be able to termiate APs. 

 

Jerrod Howard
Sr. Technical Marketing Engineer
Occasional Contributor II

Re: Master controller scalability

Hello and thank you for your quick response.
On the primary master that in my case is a 7220 controller can i terminate 800 APs or are there any scalability concerns?
I know that the specs refer that can terminate 1024 APs but the primary master controller has also other responsibilities expect termination of the APs.

Thank you.
Guru Elite

Re: Master controller scalability

Previous controllers before the 7000 series would have issues being a master controller and terminating APs.  The 7000 series does not have an issue doing so, based on what I have seen.



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Occasional Contributor II

Re: Master controller scalability

Thank you for your quick response.
So from your experience i can terminate up to 1024 APs without any issue ? Or what is the maximum you have see?

Thank you.
Guru Elite

Re: Master controller scalability

1024 APs, but you should typically only have 80% of the limits for a controller that is doing double-duty.



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

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