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

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QuestionQ483

Infrastructure Services

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Refer to the exhibit. Which interface configuration must be configured on the HUB router to enable MVPN using mGRE mode?

  • A interface Tunnel0 description mGRE - DMVPN Tunnel ip address 10.1.0.1 255.255.255.0 ip nhrp map multicast dynamic ip nhrp network-id 1 tunnel source 172.17.0.1 ip nhrp map 10.0.0.11 172.17.0.2 ip nhrp map 10.0.0.12 172.17.0.3 tunnel mode gre
  • B interface Tunnel0 description mGRE - DMVPN Tunnel ip address 10.0.0.1 255.255.255.0 ip nhrp map multicast dynamic ip nhrp network-id 1 tunnel source 10.0.0.1 tunnel mode gre multipoint
  • C interface Tunnel0 description mGRE - DMVPN Tunnel ip address 10.0.0.1 255.255.255.0 ip nhrp network-id 1 tunnel source 172.17.0.1 tunnel mode gre multipoint
  • D interface Tunnel0 description mGRE - DMVPN Tunnel ip address 10.0.0.1 255.255.255.0 ip nhrp map multicast dynamic ip nhrp network-id 1 tunnel source 10.0.0.1 tunnel destination 172.17.0.2 tunnel mode gre multipoint
Explanation

Multipoint GRE (mGRE) DMVPN hub tunnel configuration requires three key elements: (1) tunnel mode gre multipoint to enable the multipoint protocol, (2) a tunnel source set to the router's WAN/NBMA interface IP address (not the tunnel interface), and (3) NHRP enabled with a network ID. The tunnel source must be reachable on the NBMA network and cannot be the tunnel interface address itself. Option C correctly specifies tunnel source 172.17.0.1 and tunnel mode gre multipoint.

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