4A0-105: Nokia Virtual Private LAN ServicesDemo

By Nokia · Question Mode

QuestionQ150

VPLS redundancy techniques

In Active/Standby pseudowires, a failed pseudowire has recovered. Under which circumstances will the active pseudowire revert to the link that had previously failed?

  • A It will always revert to the previously failed link.
  • B It will never revert to the previously failed link.
  • C It will revert if the precedence of the previously failed link is set to 0 or "primary".
  • D It will revert if the precedence of the previously failed link is lower than the currently active link
Explanation

Revertive protection switching applies to the primary pseudowire, which is configured with precedence 0. Once that pseudowire recovers and qualifies for active state, it retakes the active role; recovered secondary pseudowires remain standby rather than automatically reverting.

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