DMVPN Questions
Question 1
Refer to the exhibit.
| interface Tunnel0 ip address 172.16.1.2 2 55. 255.255.0 ip nhrp map 172.16.1.1 192 .168.1.1 ip nhrp network-id 1 ip nhrp nhs 172.16.1.1 tunnel source 192.168.2 . 2 ip mtu 1416 |
What is wrong with the configuration of the tunnel interface of this DMVPN Phase II spoke router?
A. The interface MTU is too high.
B. The tunnel destination is missing.
C. The NHRP NHS IP address is wrong.
D. The tunnel mode is wrong.
Answer: D
Where is the statement for the Tunnel Destination ? can you see, is it now the answer B ?
In DMVPN Phase II Tunnel Destination is no used, the statement is correct “tunnel mode”.
If we added Tunnel Destination that will make it DMVPN Phase I.
No tunnel destination is needed on the Hub router. It is still needed on the spokes, even for DMVPN.
tunnel mode gre multipoint needed; no tunnel destination needed at all for phase 2
yes agree Martin , otherwise we will be building p2p tunnel
with not configured as per the question the router will fall back to
Tunnel protocol/transport GRE/IP
with it configured
Tunnel protocol/transport multi-GRE/IP
Phase 2 is point to multipoint, so tunnel destination is not required. We need to specify tunnel mode as GRE multipouint so Tunnel mode GRE multipoint commad is required.