2014年3月3日星期一

How to connecting 2 cisco 3560 switches

I try to connect 2 WS-C3560X-48T-L   switches with the 1000base-t sfp's. Tried a normal and twisted UTP cable, both no result.

Tried hard coding speed and duplex,
The connection is available at 10 and 100mb with full duplex.
Tried to connect at 1000mb it fails, i think that it is the specs of the cable (utp5 shielded) that is the problem.

digging at the cisco site i finally found some info about the specs of copper cables, but it isn't very clear.

going to buy a cat 5e/6 cable and try it again.

reply to DaSneaky1D
said by DaSneaky1D:

Have you tried using a cross-over cable?
GigE doesn't care about patch or crossover. it uses all four pairs so all you need is the pairs "paired" correctly.

said by cow116:

for 10/100/1000bps ethernet you need cat 6/6e(if they make it) for gigabit. cat 5e is only good for 10/100 and maybe 1000 if u get lucky


Cat5e is fine for GigE, no current standard requires Cat6. by far the most important thing is connectors, some people pull to many twists out when making custom cables. this is a big problem for GigE as FEXT and NEXT can happen very easily. if you're sloppy and pull the twists out you'll have "strange" issues.

said by davelaw:

gig over copper cabling from switch to switch requires a special crossover cable that can be found on the cisco website. Gige uses 4 pairs, many xover cables only cross pairs 1,2 to 3,6, but all 4 pairs need crossing for gige.
see answer 1

what model switch do you have? a 3560-24PS or WS-C3560X-48T-S , all the fastE ports are 10/100. only the SFP ports are GigE. it sounds like your trying to set the speed on the wrong port in the config.

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