Which task must be performed first to implement BFD in an IS-IS environment?
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A. B. C. D.D.
https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fs_bfd.html#wp1131797The correct answer to this question is D. Configure BFD under the IS-IS process.
Bidirectional Forwarding Detection (BFD) is a protocol used to quickly detect failures in network paths between two routers. In an IS-IS environment, BFD can be used to detect failures in IS-IS routing adjacencies.
To implement BFD in an IS-IS environment, the following steps should be taken:
Configure BFD under the IS-IS process: BFD is a feature of IS-IS, and must be configured under the IS-IS process on each router in the IS-IS network. This can be done using the "bfd" command in IS-IS configuration mode.
Configure BFD on the interface: Once BFD is configured under the IS-IS process, it must be enabled on the specific interface(s) that will use BFD to detect failures. This can be done using the "ip ospf bfd" command in interface configuration mode.
Verify BFD configuration: After BFD has been configured on the IS-IS process and the interface, it is important to verify that it is working properly. This can be done using the "show bfd neighbors" command to check the status of BFD neighbors.
Option A is incorrect because BFD should be configured under the IS-IS process before enabling it on the interface.
Option B is incorrect because disabling Cisco Express Forwarding is not necessary for implementing BFD in an IS-IS environment.
Option C is incorrect because configuring IS-IS routers as Level 2 devices is not related to implementing BFD in an IS-IS environment.