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300-620 · Question #114

Which statements are correct regarding ACI support for BFD? (Choose two.)

The correct answer is A. BFD is supported for EIGRP, OSPF, and BGP in ACI. D. BFD is supported on routed interfaces, routed subinterfaces, and SVIs.. This question assesses knowledge of BFD support within Cisco ACI's Layer 3 Out (L3Out) configurations, specifically regarding supported routing protocols and interface types.

External Network Connectivity

Question

Which statements are correct regarding ACI support for BFD? (Choose two.)

Options

  • ABFD is supported for EIGRP, OSPF, and BGP in ACI.
  • BBFD is supported on L3Out loopback interfaces.
  • CBFD is supported for BGP prefix peers (dynamic neighbors).
  • DBFD is supported on routed interfaces, routed subinterfaces, and SVIs.

How the community answered

(33 responses)
  • A
    91% (30)
  • B
    3% (1)
  • C
    6% (2)

Why each option

This question assesses knowledge of BFD support within Cisco ACI's Layer 3 Out (L3Out) configurations, specifically regarding supported routing protocols and interface types.

ABFD is supported for EIGRP, OSPF, and BGP in ACI.Correct

Cisco ACI supports Bidirectional Forwarding Detection (BFD) for enhancing the fast failure detection of neighbors for routing protocols such as EIGRP, OSPF, and BGP, which are commonly used in L3Outs. This integration allows for quicker convergence in case of a link failure.

BBFD is supported on L3Out loopback interfaces.

BFD is not supported on loopback interfaces in ACI L3Outs, as loopbacks are logical interfaces primarily used for router ID or specific routing instances and typically do not require direct link-level fault detection via BFD.

CBFD is supported for BGP prefix peers (dynamic neighbors).

BFD is not supported for BGP prefix peers (dynamic neighbors) in ACI; it is primarily intended for static or explicitly configured BGP neighbors.

DBFD is supported on routed interfaces, routed subinterfaces, and SVIs.Correct

BFD is supported on various L3Out interface types in ACI, including physical routed interfaces, routed subinterfaces, and Switched Virtual Interfaces (SVIs) when they are configured as L3Out interfaces. This broad interface support ensures flexible deployment scenarios for fast fault detection.

Concept tested: ACI BFD support for routing protocols and interfaces

Source: https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/5x/l3out-config/cisco-aci-l3out-configuration-guide-52x/m-l3out-bfd.html

Topics

#BFD#L3Out#routing protocols#interface types

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