Q44MPLS and Segment Routing
Based on the exhibit, which effect of this configuration is true?
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Community votes
Discussion · 12
2
'LDF SSO/NSF' not 'LDP SSO/NSF'. lol
2
A is the right one per your own link
2
A is correct
1
I think both A and D are true..
1
D most correct?? "MPLS LDP GR functions strictly in helper mode, which means it can ONLY help other routers that are enabled with MPLS SSO/NSF and GR to recover." https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ha/configuration/xe-3s/mp-ha-xe-3s-book/mp-ldp-grace-rstrt.html
1
Yes. To configure graceful restart between two peers, enable LDP graceful restart on both LSRs. (e-learning Cisco)
1
A is correct, there is no such thing as "LDF" SSO/NSF. It is a trick question, read the options very carefully.
1
I managed to get a hold of another dump, this question is also in that one and the answer is also A, even though option D states LDP SSO/NSF, not "LDF" SSO/NSF.
1
D: Is correct, but it has a typo, it is not "LDF", it is LDP.
A 1
Selected Answer: A
A. The key word here is support. GR is supporting a neighbor that is converging after an outage. We are not failing over to that peer.
A 1
Selected Answer: A
From the reference:
When you enable MPLS LDP GR on a router that peers with an MPLS LDP SSO/NSF-enabled router, the SSO/NSF-enabled router can keep its forwarding state when the LDP session between them gets interrupted. While the SSO/NSF-enabled router is recovering, the peer router forwards packets using stale information. This lets the SSO/NSF-enabled router come back online more quickly.
1
so it is not correct... and that's not a typo, it was done on purpose just to rule out this answer if you studied a little bit...