Delay is a measure of the time a packet takes to traverse a route. A routing protocol using delay as a
metric would choose the path with the least delay as the best path. There may be many ways to measure
delay. Delay may take into account not only the delay of the links along the route but also such factors as
router latency and queuing delay. On the other hand, the delay of a route may be not measured at all; it
may be a sum of static quantities defined for each interface along the path. Each individual delay quantity
would be an estimate based on the type of link to which the interface is connected.