A GRE tunnel is down with the error message %TUN-5-RECUR DOWN: Which two options describe possible causes of the error? (Choose two)

Question:
A GRE tunnel is down with the error message %TUN-5-RECUR DOWN:

Tunnel0 temporarily disabled due to recursive routing error.

Which two options describe possible causes of the error? (Choose two)

• A. There is link flapping on the tunnel
• B. Incorrect destination IP addresses are configured on the tunnel
• C. The tunnel mode and tunnel IP address are misconfigured
• D. There is instability in the network due to route flapping
• E. The tunnel destination is being routed out of the tunnel interface

Explanation: The %TUN-5-RECURDOWN: Tunnel0 temporarily disabled due to recursive routing error message means that the generic routing encapsulation (GRE) tunnel router has discovered a recursive routing problem. This condition is usually due to one of these causes:
+ A misconfiguration that causes the router to try to route to the tunnel destination address using the tunnel interface itself (recursive routing)
+ A temporary instability caused by route flapping elsewhere in the network

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