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Redundancy in ArubaOS 8 without MM/MCM

Hi community,

 

I have a customer that has three sites separated geographically, and connected by a MPLS network. Site 1 has a MC 7210 running 8.3, and site 2 and 3 will have MC 7210 as well, they are in the sale stage currently. Is there a way to provide redundancy between the three sites/controllers in a way that in case of a controller failure its set of APs will fail over other site/controller, all this without a dedicated MM or MCM? For example, in case of controller 2 fails, its APs will fail over controller 1. Reading documentation I see a MM/MCM is needed, and because they cannot terminate APs in ArubaOS 8, the MM/MCM must be dedicated. Customer will purchase a MM in a future, not now because of financial contraints.

 

Regards,

Julián

Super Contributor II

Re: Redundancy in ArubaOS 8 without MM/MCM

Your only option is to stick to the legacy redundancy mode (aos6). But you don’t have hitless failover like you have in a cluster.

Willem Bargeman ACMX#935 | ACCX #822

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Re: Redundancy in ArubaOS 8 without MM/MCM

Yeah, it seems so. Though in my case with MM customer will not have hitless failover either, since the sites are connected through a MPLS network and the controllers' cluster will be L3, am i right?

 

Regards,

Julián

Super Contributor II

Re: Redundancy in ArubaOS 8 without MM/MCM

Yes, but then you need a MM. Also within a cluster you can’t specify a primary and secondary controller. In this case I will advise you to create a HA group like we did with AOS6

Willem Bargeman ACMX#935 | ACCX #822

Please give me kudos if my post was useful!
If your issue is solved mark the post as solution!

Re: Redundancy in ArubaOS 8 without MM/MCM

Right. Well, I wouldn't like to revert to ArubaOS 6, since I will have to downgrade the existing controller and when they purchase the MM, upgrade again... I will see what I do... In order to have redundancy like in my case, with ArubaOS 6 I would need three devices, because the master can terminate APs, but in ArubaOS 8 I will need one more device MM oir MCM... That's one shortcoming of ArubaOS 8...

 

Regards,

Julián

Guru Elite

Re: Redundancy in ArubaOS 8 without MM/MCM

Honestly,

 

It is not favorable to do redundancy across a WAN link for an entire controller.  In most instances the performance is much worse over the WAN and would be painful to your users.  It is also not seamless, because all your users will have to obtain new ip addresses and their applications will disconnect.  If you consider controller redundancy important, the user should turn on cenralized licensing locally and add another controlller to the site. 

 


*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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Re: Redundancy in ArubaOS 8 without MM/MCM


@cjoseph wrote:

Honestly,

 

It is not favorable to do redundancy across a WAN link for an entire controller.  In most instances the performance is much worse over the WAN and would be painful to your users.  It is also not seamless, because all your users will have to obtain new ip addresses and their applications will disconnect.  If you consider controller redundancy important, the user should turn on cenralized licensing locally and add another controlller to the site. 

 


Hi,

 

I completely agree with you. In my opinion, it would be ideal if my customer can afford two controllers in each site, but it can't. So in this scenario and if one of the controllers fails, it would be better if the APs and users can fail over to other controller over the MPLS with slow connectivity, than no connectivity at all. So until my customer can purchase one more controller for every site, I think this is the "less bad" solution. Anyway, for this, I would have to revert to ArubaOS 6, which would be painful...

 

Regards,

Julián

Guru Elite

Re: Redundancy in ArubaOS 8 without MM/MCM

You don't need ArubaOS 6.x for access points to fail over to another controller.  ArubaOS 8.x can certainly do that.

 

Controllers honestly do not fail often, and many admins run into trouble planning redundancy they do not need and force outages as a result. Serious redundancy starts with the local site and then ends at a remote site as a last resort.  Remote site redundancy should honestly be a last resort, and not the first option.


*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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Re: Redundancy in ArubaOS 8 without MM/MCM


@cjoseph wrote:

You don't need ArubaOS 6.x for access points to fail over to another controller.  ArubaOS 8.x can certainly do that.


Hi,

 

I know ArubaOS 8 can provide redundancy to another controller over a MPLS network, but can do that without MM or MCM? Because my customer can't afford a MM right now. It is the main question I asked at the beggining of the post:

 

Is there a way to provide redundancy between the three sites/controllers in a way that in case of a controller failure its set of APs will fail over other site/controller, all this without a dedicated MM or MCM? For example, in case of controller 2 fails, its APs will fail over controller 1. Reading documentation I see a MM/MCM is needed, and because they cannot terminate APs in ArubaOS 8, the MM/MCM must be dedicated.

 

Regards,

Julián

Guru Elite

Re: Redundancy in ArubaOS 8 without MM/MCM

Backup LMS can be used without an MM.

 

 


*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
ArubaOS 8.4 User Guide
InstantOS 8.3 User Guide
Airheads Knowledgebase
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