China Mobile China Mobile New H3C Technologies New H3C Technologies ZTE Bidirectional Forwarding Detection (BFD) mechanisms can be used for fast detection of failures in the forwarding path of SR Policy. This document describes the encapsulation of BFD for SRv6 Policy, which can be applied for both S-BFD and U-BFD. The BFD packets may be encapsulated in transport mode or tunnel mode.