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How do I set up local dhcp scopes with two controllers. I guess I can not create the same scopes on both controllers ? What is best practice ?
I wouldn't recommend using the WLC as a DHCP server especially when you have two controllers.
Get a dedicated host to do the job. It doesn't have to be fancy. You can use numerous freeware to be a DHCP server and a syslog server to boot. An example is TFTP32.