BFD detection can be linked with which of the following modules to speed up fault detection? (Multiple choice)

Question

Options

• ABGP
• BStatic routing
• CVRRP
• DOSPF
• ERIP

• A
  70% (23)
• E
  30% (10)

Explanation

BFD (Bidirectional Forwarding Detection) is a lightweight, fast hello protocol designed to detect link or path failures in milliseconds. It can be integrated with BGP (A), Static Routing (B), VRRP (C), and OSPF (D) as a trigger mechanism - when BFD detects a fault, it immediately notifies these modules, enabling rapid route withdrawal, failover, or topology reconvergence without waiting for each protocol's native slow timers.

• BGP natively converges slowly (hold timers up to 90–180s); BFD bypasses this by delivering sub-second failure notifications directly to the BGP process.
• Static routing has no built-in failure detection at all; BFD fills this gap by monitoring next-hop reachability and pulling down static routes when the path fails.
• VRRP uses its own advertisement timers for master/backup switchover; BFD replaces this with near-instant detection, dramatically reducing downtime.
• OSPF relies on hello/dead interval timers (default 10s/40s); BFD offloads detection to the forwarding plane, allowing OSPF to react in milliseconds.
• RIP (E) is incorrect because RIP is not commonly supported for BFD session binding in most vendor implementations (including Huawei), and its hop-count-based, periodic-update model is not designed to leverage BFD's event-driven notifications.

Memory tip: Think "BFD links to the protocols you actually care about in enterprise/carrier networks - BGP, OSPF, VRRP, and Static. RIP is the legacy outsider that BFD doesn't shake hands with."

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