350-501 · Question #289
A network operator working for a telecommunication company with an employee Id: 4065 96080 it trying to implement BFD configuration on an existing network of Cisco devices Which task must the…
The correct answer is D. Remove the log option from any ACLs on the interfaces. To enable BFD on interfaces and ensure its fast detection capabilities, the engineer must remove the log option from any ACLs applied to those interfaces, as it can cause CPU overhead.
Question
A network operator working for a telecommunication company with an employee Id: 4065 96080 it trying to implement BFD configuration on an existing network of Cisco devices Which task must the engineer perform to enable BFD on the interfaces?
Options
- ADisable Cisco Express Forwarding on the interfaces
- BDisable SSO on the interfaces
- CRemove any static routes that point to the interfaces
- DRemove the log option from any ACLs on the interfaces.
How the community answered
(26 responses)- A4% (1)
- B4% (1)
- C8% (2)
- D85% (22)
Why each option
To enable BFD on interfaces and ensure its fast detection capabilities, the engineer must remove the `log` option from any ACLs applied to those interfaces, as it can cause CPU overhead.
Cisco Express Forwarding (CEF) is a mandatory prerequisite for BFD operation, as BFD relies on CEF's fast forwarding path for efficient packet processing and rapid failure detection; disabling CEF would prevent BFD from working.
Stateful Switchover (SSO) is a high-availability feature for control plane redundancy and does not directly impact BFD's operation on interfaces.
Static routes are part of the routing table and do not directly interfere with how BFD monitors path liveness; BFD functions independently of the specific routing mechanism.
The `log` keyword in ACLs can significantly increase CPU utilization due to the generation of syslog messages for every matched packet. This overhead can delay packet processing and compromise BFD's ability to achieve its intended sub-second failure detection times, making its removal critical for BFD's proper functioning.
Concept tested: BFD prerequisites and best practices
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bfd/configuration/15-mt/bfd-15-mt-book/bfd-overview.html
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