A (BGP PIC — Prefix Independent Convergence) enables BGP to rapidly converge during link or node failures by pre-installing backup forwarding paths in the FIB.
BGP PIC minimizes traffic loss during failover, improving resiliency in both edge and core environments, and is a key recommendation for scalable and high-availability BGP design in CCDE v3.1.
Why other options are incorrect:
B: BGP-EVPN is used for L2VPN services, not for fast convergence.
C: BGP FlowSpec is used for DDoS mitigation and traffic filtering.
D: BGP-LS (Link-State) provides topology distribution for controllers, not convergence.
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