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400-007 · Question #52

You are designing a network for a branch office. In order to improve convergence time, you are required to use the BFD feature. Which four routing protocols can you use to facilitate this? (Choose…

The correct answer is A. IS-IS B. static D. EIGRP E. BGP. BFD accelerates failure detection by pairing with routing protocols that have native BFD support; RIP lacks BFD integration in Cisco IOS implementations.

Designing Network Infrastructure

Question

You are designing a network for a branch office. In order to improve convergence time, you are required to use the BFD feature. Which four routing protocols can you use to facilitate this? (Choose four.)

Options

  • AIS-IS
  • Bstatic
  • CRIP
  • DEIGRP
  • EBGP

How the community answered

(33 responses)
  • A
    91% (30)
  • C
    9% (3)

Why each option

BFD accelerates failure detection by pairing with routing protocols that have native BFD support; RIP lacks BFD integration in Cisco IOS implementations.

AIS-ISCorrect

IS-IS has native BFD support, allowing BFD hello packets to detect link failures faster than IS-IS hello timers alone.

BstaticCorrect

Static routes support BFD via the 'ip route static bfd' command, enabling BFD to track next-hop reachability and remove the static route on failure.

CRIP

Cisco IOS does not support BFD integration with RIP, making RIP unable to use BFD for improved convergence.

DEIGRPCorrect

EIGRP supports BFD through the 'bfd all-interfaces' or per-interface command, enabling sub-second failure detection independent of EIGRP hello timers.

EBGPCorrect

BGP supports BFD via 'neighbor <ip> fall-over bfd', allowing BFD to trigger BGP session teardown far faster than the BGP hold-time expiry.

Concept tested: BFD support across routing protocols

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bfd/configuration/xe-16/irb-xe-16-book/bfd.html

Topics

#BFD#routing protocol support#convergence#IS-IS EIGRP BGP

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