Multiple Controllers across sites - Active/Active

Hi Guys,
Hoping I will get a few things clear in my mind regarding multiple WLC's in an Active/Active state.
At the minute we are running 1 WLC 5508 at one site - all of our APs are centrally switches. I have a number of WLANs that map to different interfaces on different VLANs - everything is working great.
We are about to take control of another business in another location and I am looking to put a wireless controller at that new site so that each controller controls a site but acts as a backup for the other site.
In case of a failure I'd like traffic to be locally switched, so first question:
1. Is there a way to centrally switch traffic whilst on the primary controller and then locally switch the traffic if a failover occurs?
2. Assuming I have to enable HREAP on all APs permenantly to get this to work, would I have to keep all the VLANs across the sites the same to make this 100% automated?
3. Do all WLANs need to be configured with the same WLAN ID in order to failover without a reboot?
Basically, my knowledge of having a dual controller is fairly limited and i'm looking at expanding that quite quickly (due to time constraints). If anyone can chime in on the above questions or even point me in the direction of any good articles regarding active/active controller setups I would be more than appreciative.
Thanks
Tim

1. Is there a way to centrally switch traffic whilst on the primary controller and then locally switch the traffic if a failover occurs?
- No... That will break. The problem with WLC's at different locations is the subnets the WLC has available to it. If your using the same SSID you really want to have two WLC at each site.
2. Assuming I have to enable HREAP on all APs permenantly to get this to work, would I have to keep all the VLANs across the sites the same to make this 100% automated?
- You can get this to work if your bridging between sites, but do you really want to.
3. Do all WLANs need to be configured with the same WLAN ID in order to failover without a reboot?
- It's best practice to try to keep them the same. If you can't it still would work.
If your really looking for redundancy then having two WLC at each site is what you want. You can user h-reap and put everything in local switching and have redundancy but understand h-reap and the limitations which might or might not be a problem for you.
Sent from Cisco Technical Support iPhone App

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Niall
user526463 wrote:
My company was recently purchased. The new company has a "policy" about any High Availability database be an Active\Active configuration. We have in the past used active\passive RAC installs with each site have multiple active RAC nodes. I am interested in see what the cases are for a true Active\Active environment where there will be multiple RAC nodes in each "cluster" and multiple databases (disk) which are actively written to, then synchronized. (As apposed to a couple mutinode RAC setups with a primary\standby database)
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user526463 wrote:
My company was recently purchased. The new company has a "policy" about any High Availability database be an Active\Active configuration. We have in the past used active\passive RAC installs with each site have multiple active RAC nodes. I am interested in see what the cases are for a true Active\Active environment where there will be multiple RAC nodes in each "cluster" and multiple databases (disk) which are actively written to, then synchronized. (As apposed to a couple mutinode RAC setups with a primary\standby database)
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