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JN0-663 Exam - Question 52


Referring to the exhibit, a Layer 3 VPN is configured, however, the routes are being hidden.

What is the problem?

Show Answer
Correct Answer: A

In the exhibit, the 'Next hop type: Unusable' indicates that the BGP peer is not reachable through the IGP. For BGP to consider a route valid, the next hop must be reachable via the IGP. If the next hop is marked as unusable, it suggests that the necessary IGP routes to reach the BGP peer are missing or incorrect, leading to hidden routes. Therefore, the issue lies with the IGP reachability to the BGP peer.

Discussion

5 comments
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Sct38Option: B
Dec 27, 2021

Correct answer is B. Next hop is unusable due to no route in inet.3. Label information is screen is VPN labels.

zakhar
Dec 29, 2021

Agreed, NH must be reachable via inet.3, and 17 seems to be vpn labels.

dimitsOption: A
May 23, 2021

Correct answer seems to be "A", since the MPLS labels do exist.

ilnohqhc4Option: A
Nov 22, 2021

"A" Is the Correct Answer.

DIbyamOption: A
Oct 22, 2022

Suppose MPLS is down then still BGP can receive and transmit VPNv4 Label/route to either side because IGP is making BGP to be in Establish state. And now if IGP is down then VPNv4 BGP Connection will not be be established. So, Correct answer is A.

ztw3587tOption: B
Jun 13, 2023

The bgp session is established because the peer is reachable through the IGP then the correct answer is B.