Hi Suman,
Adding to above,
1. Master-Standby redundancy relys on VRRP and it is Master controller redundancy
2. Master ( will be deployed in Head office) local ( WIll be deployed in a branch office) setup is required to enable distributed AP termination ( APs of a respective branch office will be terminated on Local) to avoid over load on the master and also to avoid communication latency.
Master local setup works on L3 communication (over IPSec).
3. If you want to enable the redundancy for AP termination you have two options, 1. LMS (Local ) BkpLMS (Master or any other Local) 2. Active-Active Local redundancy,
For Active- Active Local redundancy you have to bring up VRRP between two controllers (Local ) so that there is a redundancy for the LMS it self.
Hope you got some more clarity on this.
Please feel free for any further query on this.