I'm setting up an industrial network using the 2955-T switches, with two Gigabit ports and 12 fast ports. I tried connecting them with various combinations of straight-thru and crossover cables, using both the gigabit and fast ports.
My experimentation suggests that these switches have auto-MDIX enabled on the 12 fast ports, but not on the 2 gigabit ports. I have to use a crossover to connect the two with the gigabit ports. However, if I connect a gigabit port on one to a fast port on the other, either type of cable works.
The config commands don't recognize anything related to auto-mdix, either for enabling/disabling it or showing the status of the ports. I can't find anything in the docs that says that the 2955 supports auto-MDIX, although I have seen indications that the feature is being implemented on most all Cisco switches. It sure acts like it's implemented on my switches, though, at least on the fast ports.
Can anyone explain this or point me to some definitive docs? Thanks.
Automatic medium-dependent interface crossover (Auto-MDIX) is a feature that allows the switch interface to detect the required cable connection type (straight-through or crossover) and automatically configure the connection appropriately. With Auto-MDIX enabled, you can use either a straight-through or crossover type cable to connect to the other device, and the interface automatically corrects for any incorrect cabling.
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...