Late collisions are almost always becasue one side of the connection is half-duplex and the other is full-duplex.
The half-duplex protocol can accept collisions (and recover from them) only if they occur in the first 512 bit-times of the outgoing frame. Half-duplex is just like a polite conversation: if two people start speaking at the same time there is a collision: one backs off and lets the other speak. On the other hand, if one person starts speaking and the other interrupts half-way through the sentence (i.e. a late collision), then that is considered rude (i.e. an error).
Full-duplex is where both sides can talk at the same time. If one side believes it is half-duplex and the other side believes it is full, then the half-duplex side will count errors.
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...