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Refer to the exhibit. An administrator is configuring a GRE tunnel to establish an EIGRP neighbor to a remote router. The other tunnel endpoint is already configured. After applying the configuration as shown, the tunnel started flapping. Which action resolves the issue?
Correct Answer: C
In this question we are advertising the tunnel IP address 192.168.12.2 to the other side. When other end receives the EIGRP advertisement, it realizes it can reach the other side of the tunnel via EIGRP. In other words, it reaches the tunnel destination through the tunnel itself -> This causes "recursive routing" error. Note: In order to avoid this error, do not advertise the tunnel destination IP address on the tunnel interface to other side. Good recursive routing reference: https://networklessons.com/cisco/ccie-routing-switching/gretunnel- recursive-routing-error