I hope you can help me coz I think I'm missing something really basic here!
I've got a 3500XL switch and want to connect it to my core 6500's using the gig connections (via GBICs). Now, I've done this loads of times with 3550's and it's always been a simple process but something's wrong this time.
When I connect the two the 6500 sees the link as up and sees the 3500 in it's CDP neighbours. However, the 3500 sees the link as down and has nothing in the CDP table. Both interfaces are the same at both ends and have tried using a crossover cable as well as a normal one!
What am I missing?
Thanks in advance