350-501 · Question #96
Which task must be performed first to Implement BFD in an IS-IS environment?
The correct answer is D. Configure BFD in an interface configuration mode. When implementing BFD (Bidirectional Forwarding Detection) with IS-IS, the correct sequence is to first enable BFD on the physical interface in interface configuration mode (using the 'bfd interval' command to set timing parameters), and then reference BFD under the IS-IS…
Question
Which task must be performed first to Implement BFD in an IS-IS environment?
Options
- ADisable Cisco Express Forward.ng on all interfaces running routing protocols other than IS-IS
- BConfigure BFD under the IS-IS process
- CConfigure all ISIS routers as Level 2 devices
- DConfigure BFD in an interface configuration mode
How the community answered
(63 responses)- A6% (4)
- B5% (3)
- C2% (1)
- D87% (55)
Explanation
When implementing BFD (Bidirectional Forwarding Detection) with IS-IS, the correct sequence is to first enable BFD on the physical interface in interface configuration mode (using the 'bfd interval' command to set timing parameters), and then reference BFD under the IS-IS routing process configuration. BFD must exist at the interface level before IS-IS can invoke it for neighbor failure detection. Option A is wrong because CEF must remain enabled - BFD relies on CEF for fast forwarding. Option B (configuring BFD under IS-IS process) comes after the interface-level configuration. Option C (Level 2 only) is not a BFD requirement.
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