IPv6 Address Renumbering

IPv6 uses provider aggregated IP addresses. In the documentation you can read, how easy it is to do address renumbering.

You can specify a general prefix on a device. If you need to change the address, you have to change the global prefix only, and all addresses got the new prefix on this device.

On cisco devices it is:

ipv6 general-prefix PROD 2001:DB8:1234::/48
!
interface Vlan1
 description Management Network
 ipv6 address PROD ::1:0:0:0:2E1/64
 ipv6 enable
!
interface Vlan2
 description Management Network
 ipv6 address PROD ::2:0:0:0:FF/64
 ipv6 enable
!

Now you change the address of the generel-prefix PROD and all your IP addresses on this device are changed.