No interruptions in traffic even during firmware updates? The ISSU Complete Guide
One of the first perplexing moments you experience after joining a company as a network engineer is when a senior colleague says, “We’re going to update the switch firmware at 2 AM tonight, so get ready.” Whenever you update a smartphone or PC, you always have to reboot and become unusable for a few minutes. The same applies to network switches. To upgrade the firmware version, you have to turn the equipment off and on again (Reboot), and in the meantime…