The “ipv6 nd managed-config-flag” tells hosts you can use DHCP for address config as a polite suggestion (Canadians). It’s not really needed since everything works fine without the command.
The “ipv6 nd other-config-flag” tells hosts they need to use DHCPv6 to get extra info like DNS and domain names as a polite suggestion (Canadians). It’s not really needed since everything works fine without the command.
The “ipv6 nd prefix ipv6-prefix 14400 14400 no-autoconfig” tells the hosts not to use stateless configuration. Hosts still learn about the prefix though. On hosts, you just see the one address assigned from the DHCPv6 Server. This command sets the Autonomous address-configuration flag (A) to 0.
The “ipv6 nd prefix ipv6-prefix no-advertise” stops the prefix from being advertised. On hosts, you just see the one address assigned from the DHCPv6 Server.