I would not recommend to turn on portfast on port connected to other switch as this feature is to immediately put the port to forwarding state ignoring the listening, learning states which is used for STP convergence. Actually the switches are learning the MAC addresses dynamically and build the mac-address table based on the traffic going through that. I think you are confused with the port security but that is different thing and not enabled by default. Summarized you don't have to configure anything the switches will take care almost of everything :)
There's no special configuration required to have the port learn multiple MAC addresses. The switch would update the MAC address table based on the source MAC address of the ethernet frame(s) arriving on the interface. You can configure the port as an access or trunk depending on what you want to do. If the port needs to carry data for multiple VLANs then the port needs to be configured as a trunk. If the port is just an access port make sure the port is assigned to the correct access vlan 'switchport access vlan (vlan#)' command.
Moreover, you would want to enable portfast only on ports connected to end devices and not when it's connected to another switch. This mayn't create a problem if there are no redundant connections but it can create problems if any loop situation is created is unintentionally.
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 customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
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