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RIP’s third-party next-hop behavior is fully automatic. You cannot disable or enable it
At first I thought that in RIP, you can’t turn of third party next hop, meaning that RIP shouldn’t work in Phase 1 and 3. Turns out I was wrong. First off, you can turn it off by running RIP version 1. But, even with third party next hop, you can send a packet through the tunnel with another spokes tunnel IP as destination, and the Hub will happily forward it. So long as you turn off split horizon on the hub, you are fine:
Phase1-1(config-if)#interface tunnel 1
Phase1-1(config-if)# no ip split-horizon
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