It appears that Michael Thomas <mike@mtcc.com> said:
>And just as impossible since it would pop it out of the fast path. Does
>big iron support ipv6 these days?

My research associate Ms. Google advises me that Juniper does:

https://www.juniper.net/documentation/us/en/software/junos/routing-overview/topics/concept/ipv6-technology-overview.html

As does Cisco:

https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9600-series-switches/nb-06-cat9600-ser-sup-eng-data-sheet-cte-en.pdf

R's,
John