Wireless Access

Reply
Contributor I
Posts: 21
Registered: ‎02-26-2016

HA Master+Local Configuration

Aruba documentation suggests the use of local controllers at all sites and a pair of masters for management.

 

I am trying to understand if it is possible to use local controllers at all sites and have one site with one controller pair designated as a HA master and local pair, ie performing the roles of both local and master.

 

Guru Elite
Posts: 21,280
Registered: ‎03-29-2007

Re: HA Master+Local Configuration

That would be a master and backup master. Yes.


Colin Joseph
Aruba Customer Engineering

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

Contributor I
Posts: 21
Registered: ‎02-26-2016

Re: HA Master+Local Configuration

To clarify, these HA masters can terminate APs?

 

To do this, would I simply create a HA group for the two controllers and also set up a Master VRRP address? 

Guru Elite
Posts: 21,280
Registered: ‎03-29-2007

Re: HA Master+Local Configuration

The master can terminate APs. The backup master cannot.


Colin Joseph
Aruba Customer Engineering

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

Contributor I
Posts: 21
Registered: ‎02-26-2016

Re: HA Master+Local Configuration

OK so its impossible to create a pair of controllers that are both ha locals and ha masters?

 

IE if the primary master/local fails, you lose the APs at that site.

Guru Elite
Posts: 21,280
Registered: ‎03-29-2007

Re: HA Master+Local Configuration

If one controller fails at a site with two controllers, the second controller will service access points.


Colin Joseph
Aruba Customer Engineering

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

Contributor I
Posts: 21
Registered: ‎02-26-2016

Re: HA Master+Local Configuration

Aruba documentation talks about how to set up HA locals. It talks about how to set up HA masters. It also talks about how to set up a single controller as a master and local.

 

But it never talks about making a HA master and local pair. Meaning one pair of controllers that performs both functions, (master stuff and terminating APs at the same time). That when one of these fails the secondary takes over both functions as master (for everyone) and local (the aps at that site).

 

Is this possible?

 

 

Guru Elite
Posts: 21,280
Registered: ‎03-29-2007

Re: HA Master+Local Configuration

Why don't we talk about your existing setup as an example.

What do you have?


Colin Joseph
Aruba Customer Engineering

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

Contributor I
Posts: 21
Registered: ‎02-26-2016

Re: HA Master+Local Configuration

I have a site with a single controller acting as master/local. It is the master for many other HA local pairs at remote sites. It is also the local controller for one site.

 

I want to make it HA. But not just HA local (ap termination) also master (db stuff, config, etc). Possible?

 

Aruba recommends to break these into different boxes. 2 HA masters, and 2 HA locals. But that requires 4 boxes. Why not do it with 2, assuming you have the resources?

Guru Elite
Posts: 21,280
Registered: ‎03-29-2007

Re: HA Master+Local Configuration

So let's get some terminology out of the way:

 

Master = Controller where you can make changes to the global configuration.  It also has the database with all of the APs, access points neighbors and ARM calculations of all of the controllers.  It can terminate APs for client traffic.  If the master goes away, local controllers can still run, authenticate people, etc.  It just means that you have no way of changing the global configuration.  There is only one master in a master-local "system" at a time.  A master can be the "primary" for access points and a "backup" for others at the same time.  A master cannot be a master and a local at the same time.

Backup Master = Controller that backs up the master controller BUT only when the master controller goes away.  It cannot terminate access points while the master is still up.  If the master goes away the Backup Master becomes the master and you can make changes to the global configuration, as well as terminate APs on this new master.  It has to be in the same layer 2 VLAN as the master, because they must have a VRRP between them that determines who is the master.  There is at most only one Backup master in a master-local "system" at a time

Local Controller = A controller that has a read-only copy of the global configuration.  It can terminate access points and pass user traffic.  If the master goes away, and there is no backup master in the picture, you cannot make any changes to the global configuration.  There can be many, many locals in a master.  A local can be the "primary" for access points and a "backup" for others at the same time.

 

A controller is designated a master, backup master or local depending on whether or not you can change the global configuration on it.  It has nothing to do with HA, specifically.

 

Based on your statement below, you can do your configuration with just two controllers:  A master and a local.



Colin Joseph
Aruba Customer Engineering

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

Search Airheads
Showing results for 
Search instead for 
Did you mean: