In the network shown in the figure, R1 and R2 are configured with single-hop BFD detection. The network engineer found that the BFD session was Down, so he queried the BFD-related configurations of…

In the network shown in the figure, R1 and R2 are configured with single-hop BFD detection. The network engineer found that the BFD session was Down, so he queried the BFD-related configurations of R1 and R2. The configuration information has been marked in the figure. In addition, the network engineer performed the Ping 10.0.12.2 operation on R1, and the output information is shown in the figure. Based on this, the possible reason for the BFD session going Down is that the packets with UDP port 4784 are rejected.