Nokia recommends performing this migration during a maintenance window. This migration process is service-impacting.
When migrating IPoE DHCP-based hosts, Nokia recommends changing both the current DHCPv4 and DHCPv6 lease time and rebind time to one hour or more. It is also recommended to migrate only a small sample size to control the number of DHCP renews. After all leases have been changed to a shorter lease time, perform the following steps to prepare for the migration.
Remove the old subscriber and group interfaces. This may require manual clearing of subscriber sessions.
Re-create new subscriber and group interfaces for the 128-bit hosts (including SAPs).
Apply the appropriate AAA (RADIUS and Diameter) and LUDB changes (new 128-bit IPv6 addresses for all hosts), if any.
Following these preparation steps, a migration can be performed for either PPPoE and LNS hosts or IPoE DHCP-based hosts. The migration is dependent on subscriber deletion.
For PPPoE and LNS, when hosts disconnect their session, the RG may try to re-connect by PPPoE immediately and migrate to the new interface.
For IPoE hosts, new subscribers are automatically migrated upon logging in. Some end customers may be required to manually reboot the RG to send a DHCP discover/solicit.