7.4 HA-SKU with N+1 Design

[Nolan Herring]

Hello all,

I was just reviewing the config guide for 7.3 and HA-SSO and then I found out that with 7.4 it allows for an N+1 scenario.

http://www.cisco.com/en/US/prod/collateral/wireless/ps6302/ps8322/ps10315/qa_c67-714540_ps2706_Products_Q_and_A_Item.html

So my understanding of this is that instead of having say 3 controllers, and each one having a HA-SKU physically attached to it via the Redundancy Port (for a total of 6 WLC), that I can now save some money, and have 3 controllers, and a single HA-SKU controller in place to provide HA redundancy for each (one at a time).

This obviously is no longer using the RP port, and I'm having some trouble finding a config guide for this new 7.4 feature.

Does anyone know the requirements/limitations of how to set this up? Or know a link that I can read up on.

I'm assuming that a base requirement is that all of the active controllers need to be identical config wise and software/hardware (minus IP address etc.).

Thanks

[Richard Atkin · Accepted solution]

When you do N+1 with v7.4 you lose the ability to do AP SSO (comes in a later release) and you also will never get the ability to do Client SSO (that's the current stance anyway).

You configure your "N" controllers however you want, and you also have to manually configure the "+1" to exhibit whatever config you want too.  The +1 will accept APs up to its hardware limit (500 for 5508 / 1000 for WiSM2 / 6000 for 8510) and it will work just like any other WLC, but it will start nagging you to fix your network after 90 days of an AP being associated.

Config / functionality details here;

http://www.cisco.com/en/US/docs/wireless/technology/hi_avail/N1_High_Availability_Deployment_Guide.html

[Nolan Herring]

Thanks for the fast reply and the link. My google skills are getting weak  =(