QuestionQ259

Routing Policy and Manipulation

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Refer to the exhibit. A network operator is configuring BGP PIC on CE1 for already established neighborships with PE1 and PE2 within the fully converged MPLS network. Which element must be implemented for this feature to operate effectively?

  • A Bidirectional Forwarding Detection must be applied to the upstream facing BGP interfaces
  • B The operator must ensure that all prefixes have the same next-hop from PE1 and PE2 for BGP PIC
  • C A reserved BGP community of 1:10 must be used to denote the PIC feature set to the routing protocol
  • D BGP import/export policies must be applied on all devices for the routes needing BGP for PIC
Explanation

BGP PIC preinstalls a backup path so forwarding can move to it without waiting for per-prefix BGP reconvergence. Bidirectional Forwarding Detection on the directly connected PE-facing BGP links rapidly detects loss of the PE-CE path and triggers that preinstalled backup; PIC requires alternate, distinct next hops rather than identical ones.

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