Trying to understand how exactly does a single tunnel on a spoke connect to multiple hub routers in a DMVPN environment?
I see a config with multiple NHRP statements:
ip nhrp map multicast 172.16.0.1
ip nhrp map multicast 172.16.0.2
ip nhrp map 10.0.0.1 172.16.0.1
ip nhrp map 10.0.0.2 172.16.0.2
ip nhrp nhs 10.0.0.1
ip nhrp nhs 10.0.0.2
Also see crypto keyring and crypto isakmp profile configured. Is this a requirement for such a scenario?
Is there a good doc/link on cco that explains this in detail?