SLP Keep Alive is the time (in minutes) the print server waits before it sends a multicast packet on the network to prevent deletion from network device tables.

However, turning off sleep mode is not always the most desirable way of fixing this issue because you lose all the energy savings you get when the printer is able to go to sleep.įor years, an easy way to fix this on a HP device without turning off sleep mode was to use Telnet and change the SLP Keep Alive setting on the JetDirect Print Server. Most users simply turn off Sleep mode on the printer and this typically will fix the problem. This process is commonly referred to as Aging. Most managed enterprise switches automatically disable a port if no network traffic has been generated on that port for a period of time, and will remove the MAC address of the device on the port from the switch’s MAC table. This issue is caused by the network switch disabling the port to which the printer is connected because it believes that the printer is no longer connected, due to a lack of traffic on that port. Because of this, the network switch thinks the printer is no longer connected to the network and is unable to route any traffic to it.

It is because some infrastructure devices, such as network switches, delete devices from their device tables due to long period of inactivity on the network. It is actually the network infrastructure that typically causes this issue. This is usually not the fault of the printer. When you turn the printer off and then back on, it causes the printer to generate network activity again and everything starts printing and working again.

Most of the time, this happens because the printer goes to sleep for long periods of time and it loses network connectivity due to being inactive too long.

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