The command "no ip next-hop-self eigrp" tells the hub router that, when it redistributes the subnets received from one spoke back out to other spokes, it should not replace its own next hop address but should leave the original address provided by the spoke.
The question is asking what commands you would use to migrate from Phase 2 to Phase 3. Disabling EIGRP next hop self is one of the requirements for phase 3.
To migrate from DMVPN Phase 2 to Phase 3 with EIGRP, you should disable EIGRP next-hop-self on the hub. In DMVPN Phase 3, the spoke routers directly exchange routing information, including EIGRP updates, without going through the hub. Disabling EIGRP next-hop-self on the hub ensures that it doesn't modify the next-hop IP address in the EIGRP updates it sends to the spoke routers. This allows the spoke routers to use their own routing table to determine the next-hop for EIGRP updates.
Answer correct are C and E
https://networkingjournalblog.wordpress.com/2017/05/04/dmvpn-configuration-phase-3/
#ip nhrp redirect: this command informs the spokes that spoke-to-spoke communication can in fact be had directly and there is no need to traverse the hub. All it does is trigger the spoke NHRP resolution request.
Disable EIGRP next-hop-self on the hub: EIGRP next-hop-self is a feature that causes the hub to advertise its own IP address as the next hop for traffic destined for other spokes. When migrating from DM Phase 2 to Phase 3, this feature should be disabled on the hub to allow spoke-to-spoke communication without going through the hub.
D and E are correct.
Remember Phase 3 EIGRP in terms of configuration requires a slight modification to the existing configuration from phase 2, and a couple additional commands at the hub and spokes, but otherwise it is very much the same.
The additional command needed at the hub is "ip nhrp redirect". For phase 3 to be really successful, the command "no ip next-hop-self eigrp x "from phase 2 must be revoked for EIGRP. Forgetting to enable next-hop-self on the hub will give the impression that phase 3 is working when it is not.
Phase 3:
disable “no ip next-hop-self eigrp x” and enable “ip nhrp redirect.”
R1(config)# int tun 0
R1(config-if)#ip next-hop-self eigrp 100
R1(config-if)#ip nhrp redirect
Answer is D and E.
DMVPN disables the EIRGP next-hop-self with "no ip next-hop-self eigrp xxx" in DMVPN phase 2, and to go from Phase 2 to 3 you need use the NHRP protocol, and again enable EIRGP next-hop-self with "ip next-hop-self eigrp 134" under the tunnel interface
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_conn_dmvpn/configuration/15-mt/sec-conn-dmvpn-15-mt-book/sec-conn-dmvpn-dmvpn.html#GUID-BF561439-BCC0-4AAF-80D9-1F7876CB7B81
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