A networking system may include one or more nodes communicating with each other. The nodes may communicate via one or more links, which a switch or other structure may provide. The networking system may include one or more pools of at least one network diagnostic module. A network diagnostic module may test one or more links and may be configured to rove among a plurality of links. The networking system may include an alarm module. The alarm module may configure one or more network diagnostic modules to test a link. Preferably, the alarm module may, at least partially in response to a first network diagnostic module detecting particular conditions on a link, configure one or more other network diagnostic modules to test a link. The alarm module may configure the one or more other network diagnostic modules according to priority.