01-29-2016 10:50 AM - edited 07-05-2021 04:33 AM
What are all advantages of using Redundancy mode for WLC's vs using Active/Active mode
02-01-2016 02:53 AM
02-01-2016 02:50 PM
Alex,
There are no real advantages between Redundancy mode vs Active / Active it all depends on your topology and failover scenarios and downtime you can sustain.
Lets step through all the possible options.
1: Single controller
All your AP's will register to the single controller and if this controller fails you will have no wireless service until that controller has been restored.
2: 2 x Controllers in Active / Standby
With this setup you will have two controllers running in an Active / Standby configuration. They will share the same IP and configuration. They can be located in the same location or at two geographically separate locations (if you can provide L2 connectivity between both controllers)
All AP's register to a single IP address and if the primary controller fails the APs will not experience any downtime as they will instantly move to the standby controller.
3: Redundant Controllers
In this setup you have a primary controller in one location and a second controller in another location. APs will register to the primary controller and also be configured to have the second controller as a backup. In the event of a failure of the primary controller the AP's will have to re-associate to the secondary controller which could be up to 120 seconds and will result in downtime for clients.
As for advantages of either setup you need to assess your budget and downtime requirements.
Then based on your requirements you choose the best solution.
Hope that helps
02-10-2016 07:16 AM
Great, thanks for the answer
02-09-2016 06:08 AM
Simply in HA, if your primary controller went down, the AP's will go directly to the secondary without any interruption (APSSO), and your clients will not disconnect (Client SSO if it is supported). both controllers will share the same configuration including the management IP address.
In active-active clients will disconnect and the AP will disconnect if the one controller went down, because the AP will go with the joining process with the second active controller.
Kind Regards
Mohammad Setan
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