I have a problem which I just cannot work out, I have 2 x 6509's with GBIC modules in - they are currently running CATOS.
I have successfully (and easily !) setup trunk links between them and numerous 3500 switches (also with GBICs). The trouble is I cannot get a 3560g to connect directly via a trunk link and fibre (using the minigbics), is there an incompatibility problem or is it just me.
I have tried a couple of different 3560g's also change dall patch leads etc. - I can get them to connect using fibre/rj45 convertors but I wanted to use gbics both ends.
I am not sure this will help so flame me if it doesn't. The 3550's default DTP setting is âswitchport mode dynamic desirableâ and the 3560's default DTP setting is âswitchport mode dynamic autoâ.
This means that a default 3550 port will create a trunk when connected to any other port except one that is configured as a access port (âswitchport mode accessâ - no trunking). A default 3560 port will create a trunk when connected to any other port except one that is configured as a access port OR a port configured as âswitchport mode dynamic auto.â
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