Preview: You can reserve static external IPv6 addresses from

## Feature Feature **Preview**: You can reserve static external IPv6 addresses from bring your own IP addresses (BYOIP) sub-prefixes that are in`EXTERNAL_IPV6_FORWARDING_RULE_CREATION` mode. You can assign these addresses to forwarding rules for external passthrough Network Load Balancers and external protocol forwarding. You can also promote ephemeral IPv6 BYOIP addresses that are used by external forwarding rules to reserved static IP addresses. For more information, see[Create external forwarding rules](https://cloud.google.com/vpc/docs/create-ipv6-sub-prefixes#create-subprefix-use).