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Gigabit switches and 10baseT devices

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#1 systems_glitch


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Posted 29 November 2013 - 09:23 PM

I've been testing out a SMC TigerSwitch 8612T (same as a Dell 5212, managed layer 2 switch) and encountered something I'd seen before, but only in cheap, junky switches: it seems to hate 10baseT equipment. It will negotiate the proper speed, and the link comes up, but packet loss is extremely high. I've verified that it isn't anything else in the stack by plugging into my main switch, a 24-port Black Box managed switch.


I know other people have run into this before, but I've never heard a real explanation for it. I've got a bit of 10baseT gear (JetDirect card in my old LaserJet 4, Digium IAXy ATAs, old utility PC), so it's important to have backwards compatibility...especially when the product is advertised as being backwards-compatible. Does anyone know why this happens?

#2 tekio


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Posted 01 December 2013 - 06:33 AM

Are you maybe using jumbo ethernet frames on some equipment? Also, the 10BaseT could be using half-duplex. Try turing off jumbo ethernet frames and setting all NICs in full duplex mode. Some older NICs will not support full-duplex. 


Other than that, just use wireshark to watch and see what is going on.

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