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How old is the switch? &nbsp;The only noise a switch can generate would be from a fan. &nbsp;It's either the bearings or something hitting the blades. Either way, remove power, then open the case. &nbsp;The fans are probably held in by screws, unscrew and remove the fan. &nbsp;Peel off the sticker on the fans hub, lay it down flat and put 1 drop of 3-in-1 oil (or really any oil you have available). &nbsp;Get an AC adapter that provides 12vdc, you can figure this out for yourself but give the fan voltage with it laying flat.. once it spins up it will suck that drop of oil into the bearings. &nbsp;Reinstall the fan.<br />
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I've done this probably dozens of times over the years. &nbsp;If a little hands on work scares you then just measure the fans dimensions and order on from anywhere online.
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Thank you so much for your reply. log is normal. i need to replace
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@Ben Hart you also has a good post, actually i did not see yours before i rated it. sorry
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I agree that Ben's post is valid. &nbsp;Especially if you don't have SmartNet on the switch.
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With the lack of details about the actual hardware, I didn't want to assume he had anything with support or a warranty. &nbsp;But really though, it's just a fan. &nbsp;Very, very easily repaired or cheaply replaced.<br />
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:)
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Hi, there is a switch3560, which has a big noise. I think it is from its fan. Do you think it can be fixed? Thank you
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Hi, there is a switch3560, which has a big noise. I think it is from its fan. Do you think it can be fixed? Thank you

Switch has a big noise

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.