Examples disclosed herein relate to monitoring flow activity on a network device. In an example, a neighbor table is maintained on a network device. The neighbor table may include a record of a neighbor network device and a hit bit corresponding to the neighbor network device. The hit bit may be used to represent a flow activity of the neighbor network device. A determination may be made whether a status of the hit bit corresponding to the neighbor network device is inactive. If the status of the hit bit is inactive, a flow entry corresponding to the neighbor network device may be deleted from an ASIC table on the network device.