I am trying to connect a stack of 2 3750 switches into my network. I am connecting two ports on each of the 3750 into a 6509 with a straight through cable. Two will be going to a 10/100 ports and two will be going to 10/100/1000 ports. Each pair will form a Etherchannel trunk. When I connected the first cable the port would default to half duplex on the 3750 side. If I tried to force the port to full duplex it would disable to port. I think straight through is the right cable here.
You should always use cross cables when connecting between switches.
The new switches come with MDIX feature and hence you can even connect them using stright cables. But based on my experience with MDIX, i would suggest you to always use cross cables between switches and hard code the speed & duplex settings.
As posted above the speed and duplex needs to match at both ends for etherchannel configuration.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...