CCIE Routing & Switching Question of the Week: Dynamic Multipoint VPN

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CCIEQoWSquare180803239Refer to the exhibit below. The spoke (R2) of the DMVPN (Dynamic Multipoint VPN) is not able to register to the hub router (R1), why? (Choose all that apply).

A. The MTU size is wrong.
B. The spoke ip nhrp network-id is wrong, it should be 1.
C. The routers should be using the Loopback interfaces address, not the FastEthernet as source.
D. The spoke routers’ ip nhrp nhs is wrong, it should be ip nhrp nhs 99.1.1.1.
E. There is nothing wrong, try reloading the routers.
F. The mapping on the spoke has the addressing reversed.

hostname R1 ! Hub
 !
 interface Loopback0
 ip address 1.1.1.1 255.255.255.255
 !
 interface Tunnel0
 ip address 99.1.1.1 255.255.255.0
 no ip redirects
 ip mtu 1416
 ip nhrp map multicast dynamic
 ip nhrp network-id 1
 tunnel source 10.15.15.1
 tunnel mode gre multipoint
 !
 interface FastEthernet0/0
 ip address 10.15.15.1 255.255.255.0
 speed auto
 duplex auto
 !
 
hostname R2 ! Spoke
 !
 interface Loopback0
 ip address 2.2.2.2 255.255.255.255
 !
 interface Tunnel0
 ip address 99.1.1.2 255.255.255.0
 no ip redirects
 ip mtu 1416
 ip nhrp map 10.15.15.1 99.1.1.1
 ip nhrp map multicast 10.15.15.1
 ip nhrp network-id 10
 ip nhrp nhs 10.15.15.1
 ip ospf network non-broadcast
 ip ospf priority 0
 tunnel source 10.15.15.2
 tunnel mode gre multipoint
 !
 interface FastEthernet0/0
 ip address 10.15.15.2 255.255.255.0
 speed auto
 duplex auto
 !

Reveal Answer

Related Courses
BGP — Configuring BGP on Cisco Routers v3.2
QOS — Implementing Cisco Quality of Service
MPLS — Implementing Cisco MPLS v2.3

CCIE Routing & Switching Question of the Week Series

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