If a packet is routed to a port that is already busy on a router, the router will wait to send the packet for the watchdog timer period. If it times out it will spill the packet, but not append an EEP to the end of the packet since no data from the packet has been sent. This is different from the case in the section “Watchdog Timers“, as there the packet is in the process of being sent through a router output port when it becomes blocked. Here the packet has not yet been switched to the output port, as that port is busy.