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Frequent Contributor I
Posts: 83
Registered: ‎09-08-2015

HA Fast Failover - failure scenario

Hi there,

 

I have a couple of questions regarding HA fast failover in the following scenario.

 

2 x 7205 controllers deployed in different datacentres (no stretched VLANs).

 

First controller configured as Master and 'Active' in HA group.

Second controller configured as Local and 'Standby' in HA group.

 

As I understand, only one LMS IP is configured (HA active address) and when the AP connects it establishes a tunnel to the secondary controller as well.

 

What happens if, following failure of the master controller, an AP reboots - it won't be able to communicate with the Master to get LMS IP address? Or does it cache the information about the secondary controller?

 

Also, in an HA fast failover scenario, will all clients be disconnected when the AP's start to use their standby tunnel? (Egress tunnel is different L3 subnet at each datacentre).

 

TIA!

 

MVP
Posts: 4,271
Registered: ‎07-20-2011

Re: HA Fast Failover - failure scenario

 

If the AP reboots while attached to the Standby controller and the Active controller still down then the AP won't be able to find the Standby controller , you will need to configure the Standby as the Backup LMS IP so the AP is able to find the Standby Controller while the Active Controller still down.

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Guru Elite
Posts: 21,018
Registered: ‎03-29-2007

Re: HA Fast Failover - failure scenario

 

Also, in an HA fast failover scenario, will all clients be disconnected when the AP's start to use their standby tunnel? (Egress tunnel is different L3 subnet at each datacentre).

 

TIA!

 


Access points send a deauth to all clients attached when they fail over to their secondary controller.  The client has an opportunity to perform a full authentication and get an ip address from a new subnet, as a result.



Colin Joseph
Aruba Customer Engineering

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