Which two statements about MPLS LDP Session Protection are true? (Choose two.)
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A. B. C. D. E.CD.
https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fssespro.htmlMPLS LDP (Label Distribution Protocol) Session Protection is a feature used in MPLS networks to protect MPLS LDP sessions from being disrupted during a network failure. Here are the explanations of each statement:
A. LDP session protection can be applied onto a directly connected neighbor: This statement is true. LDP session protection can be configured on a per-interface basis for a directly connected neighbor. When enabled, it allows the LDP session to be protected from link and node failures by establishing a backup LDP session over a different path. This ensures that label distribution continues uninterrupted during a failure.
B. LDP label bindings must be re-advertised when the directly connected link comes back: This statement is also true. When a failure occurs, LDP session protection automatically switches over to the backup LDP session. When the failed link comes back, the original LDP session is restored, and the label bindings must be re-advertised over the restored link.
C. LDP session stays up as long as the LDP peer is reachable after a network failure: This statement is true. The LDP session will stay up as long as the LDP peer is reachable after a network failure. The backup LDP session is established only if the original LDP session cannot be restored.
D. MPLS LDP session protection uses LDP targeted hellos: This statement is true. MPLS LDP session protection uses LDP targeted hellos to maintain the backup LDP session. LDP targeted hellos are sent to a specific LDP peer and are used to verify the reachability of the LDP peer.
E. MPLS LDP session protection and LDP IGP synchronization are mutually exclusive features: This statement is false. MPLS LDP session protection and LDP IGP synchronization are not mutually exclusive features. MPLS LDP session protection can be used in conjunction with LDP IGP synchronization to ensure that label distribution continues uninterrupted during a network failure. LDP IGP synchronization ensures that the LDP session is synchronized with the IGP routing table.