Examples disclosed herein relate to a method comprising receiving requesting, at a first network device, a Bidirectional Forwarding Detection session with a second network device, determining, by the first network device, that the BFD session is for single hop data and determining, by the first network device, that the BFD session is over a network tunnel from the first network device to the second network device. The method may include initiating the BFD session between the first and second network devices, wherein the BFD session is shared between multiple clients requesting BFD sessions on a network tunnel, but is not shared not between tunneled and non-tunneled sessions between the multiple clients. The method may include transmitting, the single hop data to the second network device via the network tunnel, wherein the network tunnel traverses a multiple hop network path and disabling echo packets for the BFD session.