Home » Cisco » 300-410 » Which two solutions are used to overcome a flapping link that causes a frequent label binding exchange between MPLS routers?
Which two solutions are used to overcome a flapping link that causes a frequent label binding exchange between MPLS routers? (Choose two)
A. Create link dampening on links to protect the session.
B. Increase input queue on links to protect the session.
C. Create targeted hellos to protect the session.
D. Increase a hold-timer to protect the session.
E. Increase a session delay to protect the session.
Correct Answer: AC
Explanation/Reference:
Explanation:
To avoid having to rebuild the LDP session altogether, you can protect it. When the LDP session between two directly connected LSRs is protected, a targeted LDP session is built between the two LSRs. When the directly connected link does go down between the two LSRs, the targeted LDP session is kept up as long as an alternative path exists between the two LSRs.
For the protection to work, you need to enable it on both the LSRs. If this is not possible, you can enable it on one LSR, and the other LSR can accept the targeted LDP Hellos by configuring the command mpls ldp discovery targeted-hello accept.
Reference: https://www.ccexpert.us/mpls-network/mpls-ldp-session-protection.htmlOr from the referenceat https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2019/pdf/5eU6DfQV/TECMPL-3201.pdfTroubleshooting LDP IssuesProblem:
I. When a link flaps (for a short time),
…S olution:
+ When LDP session supported by link hello is setup, create a targeted hello to protect the session.
