A network administrator added a new spoke site with dynamic IP on the DMVPN network. Which configuration command passes traffic on the DMVPN tunnel from the spoke router?
A network administrator added a new spoke site with dynamic IP on the DMVPN network. Which configuration command passes traffic on the DMVPN tunnel from the spoke router?
In a Dynamic Multipoint Virtual Private Network (DMVPN) setup, when a spoke site has a dynamic IP address, it is important to allow the spoke to register dynamically with the hub router while maintaining appropriate handling of its NHRP (Next Hop Resolution Protocol) registration. The correct command for this scenario is 'ip nhrp registration no-unique', which allows the spoke router to register even when its public IP address changes. This configuration is especially useful for environments where public IP addresses may change frequently, such as in dial-up or dynamic IP settings.
Non-Unique Registrations If you’re experiencing DMVPN downtime due to changing public IP addresses of your DMVPN spokes, apply the ip nhrp registration non-unique interface configuration command to the DMVPN tunnel interface. This command will reduce the recovery time to less than a minute. Faster recovery is harder to achieve as the router has to execute a number of steps following a physical interface flap: Install new static routes to the hub sites; Create IPSec session with the hub sites; Register new public IP address with NHRP; Establish routing adjacency. You can fine-tune steps 1-3 on the spoke router; step 4 sometime requires coordinated changes throughout the network. https://blog.ipspace.net/2010/09/dmvpn-non-unique-nhrp-registrations.html
option C is correct https://community.cisco.com/t5/security-knowledge-base/unable-to-pass-traffic-on-the-dynamic-multipoint-vpn-tunnel-with/ta-p/3111776#:~:text=If%20you%20configure%20the%20ip,such%20as%20a%20dial%20environment.
C is correct
seems right: https://yurmagccie.wordpress.com/2016/06/07/dmvpn/ Search for 'no-unique'