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Exam 300-410 topic 1 question 94 discussion

Actual exam question from Cisco's 300-410
Question #: 94
Topic #: 1
[All 300-410 Questions]

Which statement about MPLS LDP router ID is true?

  • A. If not configured, the operational physical interface is chosen as the router ID even if a loopback is configured.
  • B. The loopback with the highest IP address is selected as the router ID.
  • C. The MPLS LDP router ID must match the IGP router ID.
  • D. The force keyword changes the router ID to the specified address without causing any impact.
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
Reference:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ldp/configuration/12-4m/mp-ldp-12-4m-book.pdf
by Jack1188 at Aug. 11, 2020, 5:03 a.m.

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[Removed]
10 months, 2 weeks ago
Selected Answer: B
B is correct
upvoted 1 times
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XBfoundX
11 months, 1 week ago
B is the correct one, also D could be correct but read the last few words... Is saying without causing any impact :) Cause the router ID of LDP will be also the transport adress then if we change the router id we will tear down the LDP session with our LDP peers, so we need to wait and build UP again the LDP session. If the LDP session is down you can no longer advertise the prefixes in mpls with labels so yeah.... There will be a little impact.
upvoted 2 times
XBfoundX
11 months, 1 week ago
Transport address is the same as the LDP router ID. hold-interval is always set to three times the LDP discovery hello-interval. Transport address is the address used for the TCP session over which LDP is running. If the transport address is not configured, the LDP router-id is used as transport address.
upvoted 1 times
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bk989
11 months, 2 weeks ago
Given answer is correct. As for the "force" keyword: The force keyword forces the LDP router ID to change immediately to the specified address without waiting for a restart of the LDP process. This can cause LDP session flaps and potentially disrupt MPLS LDP label bindings temporarily as the LDP sessions need to be re-established with the new router ID.
upvoted 2 times
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inteldarvid
1 year, 10 months ago
Selected Answer: B
the anwser corret is B
upvoted 1 times
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error_909
3 years, 8 months ago
The given answer is correct - The loopback with the highest IP address is selected as the router ID.
upvoted 2 times
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[Removed]
3 years, 9 months ago
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ldp/configuration/12-4m/mp-ldp-12-4m-book.pdf
upvoted 2 times
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[Removed]
3 years, 9 months ago
The given answer is correct
upvoted 1 times
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CraigB83
4 years, 7 months ago
B "LDP will use the router ID as the source of TCP session. These IP has to be /32 and be in reachable. To modify the router ID use the command mpls ldp router-id (inteface) [force]. By default router ID is selected with the highest IP of a loopback, if non exist the highest IP of any active interfaces."
upvoted 4 times
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Jack1188
4 years, 9 months ago
b win this question.
upvoted 1 times
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