Which BGP feature provides fast convergence?

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.