Those switching ASICs are very complex and setup and bootstrapping is complicated on its own, but it's been done for (now legacy) switching and fabric ASICs and

Those switching ASICs are very complex and setup and bootstrapping is complicated on its own, but it's been done for (now legacy) switching and fabric ASICs and it's still being done for more current devices. A lot of effort is going to the 10G and 100G top of rack models because that's usually where you can backport to 1G/10G access switches. The core switches and more complex models have not seem much success.