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Exam 300-410 topic 1 question 453 discussion

Actual exam question from Cisco's 300-410
Question #: 453
Topic #: 1
[All 300-410 Questions]



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.
  • B. Stop sending a route matching the tunnel destination across the tunnel.
  • C. Advertise the Loopback0 interface from R2 across the tunnel.
  • D. Readdress the IP network on the Tunnel0 on both routers using the /31 netmask.
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Suggested Answer: B 🗳️
by HungarianDish_111 at June 8, 2023, 2 p.m.

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HungarianDish_111
Highly Voted 1 year, 11 months ago
The output is not completely relevant to the question. It only shows that the tunnel network is advertised, which is OK. It should not advertise 10.255.255.1 0.0.0.0 (the physical address/WAN address of the peering) under the same eigrp process, because that would cause a loop.
upvoted 8 times
bk989
8 months, 2 weeks ago
correction we should not advertise the 192.168.1.0 network through eigrp. This is the tunnel address and what is causing the loop. When we advertise the NBMA address and tunnel address in same routing protocol we cause a midhcain attempting to stack loop. Removing either one works.
upvoted 3 times
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inteldarvid
Highly Voted 1 year, 9 months ago
Selected Answer: B
B correct: 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.
upvoted 8 times
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[Removed]
Most Recent 9 months, 3 weeks ago
Selected Answer: B
B is correct
upvoted 1 times
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inteldarvid
1 year, 9 months ago
https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/22327-gre-flap.html
upvoted 1 times
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