I believe that there is a logical fallacy in your question. You ask:
"I mean the real bandwidth, or speed (as used with real ethernet), or clock rate (used with serial lines)."
but real bandwidth (or real speed) exists only on physical interfaces. A SVI is a virtual interface and as such does not have a real bandwidth. If anything the bandwidth of a SVI is the bandwidth of the backplane of the switch.
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...