352-001 · Question #74
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 fou
The correct answer is A. EIGRP B. IS-IS C. BGP D. static. BFD (Bidirectional Forwarding Detection) integrates with EIGRP, IS-IS, BGP, and static routes on Cisco platforms to provide sub-second failure detection, but RIP has no BFD support.
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
- AEIGRP
- BIS-IS
- CBGP
- Dstatic
- ERIP
How the community answered
(22 responses)- A86% (19)
- E14% (3)
Why each option
BFD (Bidirectional Forwarding Detection) integrates with EIGRP, IS-IS, BGP, and static routes on Cisco platforms to provide sub-second failure detection, but RIP has no BFD support.
EIGRP supports BFD integration on Cisco IOS/IOS-XE, allowing BFD to detect link failures and trigger EIGRP reconvergence far faster than EIGRP hello/hold timers permit.
IS-IS supports BFD on Cisco platforms, enabling BFD sessions to detect forwarding path failures and drive IS-IS reconvergence within milliseconds rather than waiting on IS-IS hello intervals.
BGP supports BFD integration to provide sub-second peer failure detection, which is critical because BGP's native keepalive-based detection is extremely slow by comparison.
Static routes support BFD on Cisco IOS/IOS-XE so that when BFD detects a next-hop failure, the associated static route is immediately withdrawn from the routing table, improving convergence without a dynamic protocol.
RIP does not support BFD integration on any Cisco platform - Cisco has not implemented BFD support for RIP, so RIP cannot leverage BFD for fast failure detection.
Concept tested: BFD integration with routing protocols for fast convergence
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bfd/configuration/xe-16/irb-xe-16-book/bfd.html
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