According to the Cisco website, the most recent firmware (I should say the most recent AND recommended one) is: īut I figured that couldn't be loaded on my production switch. The switch I will be adding to the one above is a brand new: 3750X-48-PF-S. Not much of a difference but I might as well go to the most current version that I can. According to the Cisco website, the most recent firmware available for that model is: Ĭurrently on that switch is: 5.bin The current SINGLE switch in production is a WS-C3750-48PS-S. Please insure power to the stack does not get interrupted during the micro-code upgrade, as this usually results in bricking the device(s) and needing to get RMA replacements. This process will take an especially long time if you are jumping from a 12.2(55)SE release to a 15.0(2)SE release, as there will be a switch micro-code upgrade that will be applied upon reload. By a 'stack of older 3750 with a newer 3750' do you mean the master or a member is getting upgraded? If so, you may want to consider doing an upgrade to the existing master and members using the archive download-sw command first to bring all members to the right code revision, and then add in the new member.

It is pretty typical for a stack of switches (2960x/s, 3750 series) to take 30 min or longer to fully complete an auto-advise/auto-upgrade via downloading code from a stack master to newly added members that are off by a major/minor revision. One word of caution, if it feels like it takes a long time for the auto-upgrade to occur, do not worry. I will take any and all advice appreciatively! However, without having end devices attached to it, I really have no way of knowing if there HAD been devices attached, that they would work as they had before the upgrade.Īre there any 'gotchas' I need to worry about when I do this in production? Luckily, this switch is one that, for the most part, is not being used on Saturday mornings so I would have about a 5 hour window, to do the upgrade. And by that I mean, I didn't get any errors and it booted right back up with the config file intact. I did it via tftp but also had it connected by console just in case. Having never done this before, I grabbed a Cisco switch that was replaced a while ago. I know they both need to be on the same version so this makes it a good time for me to upgrade our older Cisco with the current recommended version (I believe 15.xxx). I have been tasked with creating a stack out of an older 3750, with a newer 3750.

Cisco 3750 software upgrade