Bidirectional Forwarding Detection

BFD (Bidirectional Forwarding Detection) mechanism uses packets to inform both ends that the protocol is configured. With these packets, BFD provide basic connectivity and the parameter negotiation. The main role 
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BFD (Bidirectional Forwarding Detection) is basically another Hello protocol based on UDP that detects link failures on forwarding plane. BFD runs on top of Layer 2 protocols that is in 
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