To enable IPv6 over DMVPN using mGRE, which configuration command is required to build an IPv6 mGRE tunnel neighborship?
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Correct answer: tunnel mode gre multipoint ipv6.
Why this is the answer
The tunnel mode gre multipoint ipv6 command is essential because it explicitly configures the tunnel interface to operate in GRE multipoint mode and specifies that the tunnel will carry IPv6 traffic. This enables the necessary IPv6 over mGRE functionality for DMVPN. ipv6 nhrp holdtime 30 is an NHRP (Next Hop Resolution Protocol) command, not a tunnel mode command. While NHRP is crucial for DMVPN, this command sets a timer, not the tunnel's fundamental operating mode or traffic type. ipv6 unicast-routing enables global IPv6 routing on the device but does not configure a specific tunnel interface for IPv6 over mGRE. tunnel protection mode ipv6 is used for IPsec tunnel protection, not for defining the GRE tunnel mode itself.
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