In some examples, a network device may determine an uptime of a first port and a second port, compare the uptimes of the first and second ports to a transmit interval time, and determine that the first port is connected to the network device via a more recently configured link than the second port and is the cause of the network loop when the uptime of the first port is less than the transmit interval time. The network device may determine that the second port is connected to the network device via a less recently configured link than the first port and is not the cause of the network loop when the uptime of the second port is greater than the transmit interval time and disable the first port based on the determination that the first port is connected to the network device via the more recently configured link.