This is the situation.
I have connected some switches: WS-C3560-48PS-S, WS-C3550-24-EMI, WS-C3508G-XL-EN and WS-C2950G-24-EI.
WS-C3560-48PS-S (GLC-LH-SM) - LC-SC (Single mode fiber) - WS-C3508G-XL-EN (WS-G5486)
WS-C3560-48PS-S (GLC-SX-MM) - LC-SC (Multi mode fiber) - WS-C3550-24-EMI (WS-G5484)
WS-C3560-48PS-S (GLC-SX-MM) - LC-SC (Multi mode fiber) - WS-C2950G-24-EI (WS-G5484)
The LED's on the WS-C3550-24-EMI, WS-C3508G-XL-EN and WS-C2950G-24-EI are green.
The LED's on the WS-C3560-48PS-S are amber.
The LED's are blinking.
I tried different WS-C3560-48PS-S switches, different SFP modules.
See attachment for topology.
Can anyone tell me what's goning on here?
Solution: I dind't cofigured trunk links on the WS-C3560-48PS-S. So there was a mismatch between the ports.
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