Change RADIUS, Diameter, and LUDB in advance of migrations to minimize service impact. Ensure that MSAP stickiness is disabled and idle sticky MSAPs are removed. Nokia recommends performing this migration during a maintenance window.
To prepare to migrate PPPoE and IPoE DHCP hosts on MSAPs, perform the following steps.
Create new subscriber and group interfaces for the 128-bit WAN mode.
Update the database for the host-related MSAP parameters. This includes AAA (both RADIUS and Diameter) and LUDB. The updated database directs subscribers to the new subscriber and group interface.
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 hosts, when a host disconnects their session, the next session is migrated. To speed up the migration, and depending on the RG capability, manually clearing the session could trigger the RG to re-connect through PPPoE immediately, and migrate to the new interface.
When migrating IPoE DHCP-based hosts, Nokia recommends changing both the current DHCPv4 and DHCPv6 lease time and rebind times to one hour or more. It is important to migrate only a small sample size to control the number of DHCP renews. Subscribers are migrated in the following three ways.
Subsets of subscribers are migrated to the new 128-bit interface without any end user action. For example, the end user does not need to reset their modem or RG. The new authentication establishes the host on the new interface. A maintenance window is not required.
To migrate the remaining subscribers, enable the drain function on the DHCP server to stop all DHCP lease renewal. However, the DHCPv4 and DHCPv6 lease for a subscriber may end at different times. When both the DHCPv4 and DHCPv6 leases end, the subscriber is removed from the system. Depending on the RG/CM capability, it may send a DHCP request immediately for a new DHCPv4 and DHCPv6 addresses. The subscriber is now created on the new 128-bit subscriber interface without any action by the end user.
For any remaining subscribers that have not been migrated, after the migration window has waited for the one hour lease time, action by the end user may be required. The operator must shut down both the subscriber interface and group interface, and clear all remaining hosts from those interfaces. The end user is then required to manually reboot the RG to send a DHCP discover/solicit.