This question gets asked a lot in this forum. I got this link off Cisco's website...I'm not affiliated, I just thought it might be helpful. When Cisco says you need a 3rd party solution for this...this is what they mean:
If you set the backhaul-session-manager into set mode after entering the bsm, it Creates a fault-tolerant or non-fault-tolerant session set with the client or server option
Router(config)# backhaul-session-manager
Router(config-bsm)#
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