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Frequent Contributor I
Posts: 64
Registered: ‎01-27-2014

clarification on Master Redundancy and Fast Failover

Hi.

Currently I have 2 controllers set for Master Redundancy (active/standby) and Fast Failover (both set as dual) at the same time. In AP profile LMS IP has IP address of active controller and backup LMS IP has IP address of standby controller.

The problem is when I break communication between APs and both controllers for a moment (controllers notice that APs are down) and then restore communication, APs will not reconnect to any controller. I have to reboot APs.

Similar issue is when active controller is down and standby becomes new active then when APs are booted, they will not connect to new active controller.

Is it normal behavior in this setup?

Also can I move some APs (make them active) on standby controller? I think the answer is no but I want to make sure.

Guru Elite
Posts: 8,322
Registered: ‎09-08-2010

Re: clarification on Master Redundancy and Fast Failover

If you are not using locals and all of your APs are terminating on masters, you should not use these two features together.

Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Frequent Contributor I
Posts: 64
Registered: ‎01-27-2014

Re: clarification on Master Redundancy and Fast Failover

Couple of weeks ago I upgraded controllers to 6.4 to have this option supported and it works well except these issues.

I haven't seen any document stating it's not recommended. Can you provide any details? What setup would you recommend?

Aruba Employee
Posts: 151
Registered: ‎02-14-2013

Re: clarification on Master Redundancy and Fast Failover

[ Edited ]

Hi,

 

You can find the below note @ http://www.arubanetworks.com/techdocs/ArubaOS_63_Web_Help/Content/ArubaFrameStyles/VRRP/HighAvFastFailover.htm

 

===

High Availability:Fast Failover provides redundancy for APs, but not for controllers. Deployments that require master controller redundancy should continue to use an existing VRRP redundancy solution.

===

 

Rajaguru Vincent

Thanks,
Rajaguru Vincent
Frequent Contributor I
Posts: 64
Registered: ‎01-27-2014

Re: clarification on Master Redundancy and Fast Failover

I know that note but for me it means that Fast Failover can be used for AP redundancy and VRRP can be used for controller redundancy. For me these are two seperate solutions but one doesn't exclude the second one.

Anyway, what solution would you recommend?

MVP
Posts: 4,227
Registered: ‎07-20-2011

Re: clarification on Master Redundancy and Fast Failover

The only issue I see is if APs build a second stand by tunnel but because the controller is part of the stand by master redundancy it won't build it since the standby master by default can't build a any tunnels with APs until
It becomes the primary
Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Frequent Contributor I
Posts: 64
Registered: ‎01-27-2014

Re: clarification on Master Redundancy and Fast Failover

I think the tunnels are established because 'show ap standby' on standby controller displays all APs and during failover APs become active very quickly (without it I think it would take much longer).

MVP
Posts: 4,227
Registered: ‎07-20-2011

Re: clarification on Master Redundancy and Fast Failover

I thought you mentioned that APs were not able to reconnect when standby became active
Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Aruba Employee
Posts: 100
Registered: ‎12-02-2011

Re: clarification on Master Redundancy and Fast Failover

Hi,

 

Remove backup lms IP from AP system profile. Just have LMS IP pointed to Master controller's physical IP address.

 

Make sure the ip-addresses you are using in HA config are controller/switch IPs and not just any other interface IPs. 

 

 

Here is my config for Master-Standby Master HA setup:

 

  • Master (10.10.1.1)
vlan 10
!
interface vlan 10
  ip address 10.10.1.1 255.255.255.0
!
controller-ip vlan 10
!
vrrp 10
  ip address 10.10.1.3
  vlan 10
  no shutdown
  priority 110
 !
master-redundancy
  master-vrrp 10
  peer-ip-address 10.10.1.2 ipsec <key>
!
Ha group-profile Building-A							
  controller 10.10.1.1 role dual
  controller 10.10.1.2 role dual
  state-sync
  pre-shared-key <key>
!
Ha group-membership Building-A
!
ap system-profile Building-A
lms-ip 10.10.1.1
!
  • Standby Master (10.10.1.2)
vlan 10
!
interface vlan 10
  Ip address 10.10.1.2 255.255.255.0
!
controller-ip vlan 10
!
vrrp 10
  ip address 10.10.1.3
  vlan 10
  no shutdown
  priority 110
 !
master-redundancy
  master-vrrp 10
  peer-ip-address 10.10.1.1 ipsec <key>
!
Ha group-membership Building-A
!
Frequent Contributor I
Posts: 64
Registered: ‎01-27-2014

Re: clarification on Master Redundancy and Fast Failover

Thanks. I'll try that configuration.

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