Reviewer: Christian Huitema Review result: Has Nits BFD, defined in RFC5880, is a protocol intended to detect faults in the bidirectional path between two forwarding engines, including interfaces, data link(s), and to the extent possible the forwarding engines themselves, with potentially very low latency. The Yang module defined in this draft enables management of this protocol, such as toggling parameters or receiving notifications. As stated in the security section, the module is "to be accessed via the NETCONF protocol [RFC6241]", and as such its security is pretty much tied to that of NETCONF. My only nit comes from reading section 6.8.16 of RFC 5880, about "Administrative Control". This points to an obvious issue when the administrator of a router disables BFD on a particular link, either by mistake or by malice. This will make future failures harder to notify, and can affect operation of the network. Nothing much can be done about that on the node itself, but I would expect that disabling BFD would raise some kind of alarm at the other end of the link. I did not understand how that alarm is described in the Yang module, but that may be because I am not all that familiar with Yang.