300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

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QuestionQ460

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Refer to the exhibit. An engineer must configure a DMVPN Phase 3 hub-and-spoke topology to enable a spoke-to-spoke tunnel. Which NHRP configuration satisfies the requirement on R6?

  • A interface Tunnel1 ip nhrp authentication Cisco123 ip nhrp map multicast dynamic ip nhrp network-id 1 ip nhrp holdtime 300 ip nhrp redirect
  • B interface Tunnel 1 ip address 192.168.1.1 255.255.255.0 tunnel source e 0/1 tunnel mode gre multipoint ip nhrp network-id 1 ip nhrp map 192.168.1.2 192.1.20.2
  • C interface Tunnel1 ip nhrp authentication Cisco123 ip nhrp map multicast dynamic ip nhrp network-id 1 ip nhrp holdtime 300 ip nhrp shortcut
  • D Interface Tunnel 1 ip address 192.168.1.1 255.255.255.0 tunnel source e 0/0 tunnel mode gre multipoint ip nhrp network-id 1
Explanation

In a DMVPN Phase 3 deployment, the hub sends NHRP redirect messages when it detects traffic between spokes; this lets the spokes resolve each other and establish a direct spoke-to-spoke tunnel. Therefore, the hub requires ip nhrp redirect. ip nhrp shortcut is the complementary spoke-side command.

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