Which statement about BFD on Cisco IOS XR Software is true?

Which statement about BFD on Cisco IOS XR Software is true?
A . Cisco IOS XR router must use LDP to route back to the Cisco IOS router to establish the peer relationship.
B . Cisco IOS XR Software does not support BFD multihop for IPv4.
C . Cisco IOS XR router must use dynamic routing or a static route back to the Cisco IOS router to establish the peer relationship.
D . BFD is not compatible between Cisco IOS XR and Cisco IOS Software.

View Answer

Answer: C

Explanation:

A router running BFD in Cisco IOS software can designate a router running BFD in Cisco IOS XR software as its peer using the bfd neighbor command; the Cisco IOS XR router must use dynamic routing or a static route back to the Cisco IOS router to establish the peer relationship.

https://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r6-1/routing/configuration/guide/b-routing-cg-crs-61x/b-routing-cg-crs-61x_chapter_0100.html

Reference: https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-3/routing/configuration/guide/b-routing-cg-asr9000-63x/b-routing-cg-asr9000-63x_chapter_0100.html