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Question 283 - 300-410 discussion

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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?

A.

Modify the network command to use the Tunnel0 interface netmask

Answers
A.

Modify the network command to use the Tunnel0 interface netmask

B.

Advertise the Loopback0 interface from R2 across the tunnel

Answers
B.

Advertise the Loopback0 interface from R2 across the tunnel

C.

Stop sending a route matching the tunnel destination across the tunnel

Answers
C.

Stop sending a route matching the tunnel destination across the tunnel

D.

Readdress the IP network on the Tunnel0 on both routers using the /31 netmask

Answers
D.

Readdress the IP network on the Tunnel0 on both routers using the /31 netmask

Suggested answer: C

Explanation:

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-routingswitching/gretunnelrecursive-routing-error

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asked 07/10/2024
Christian Weber
33 questions
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