Which failover detection protocol must be used to meet this requirement?

An NSX administrator wants to create a Tler-0 Gateway to support equal cost multi-path (ECMP) routing.

Which failover detection protocol must be used to meet this requirement?
A . Bidirectional Forwarding Detection (BFD)
B . Virtual Router Redundancy Protocol (VRRP)
C . Beacon Probing (BP)
D . Host Standby Router Protocol (HSRP)

Answer: A

Explanation:

According to the VMware NSX 4.x Professional documents and tutorials, BFD is a failover detection protocol that provides fast and reliable detection of link failures between two routing devices. BFD can be used with ECMP routing to monitor the health of the ECMP paths and trigger a route change in case of a failure12. BFD is supported by both BGP and OSPF routing protocols in NSX-T3. BFD can also be configured with different timers to achieve different detection times3.