Seamless migration from LDP-VPLS to EVPN

Currently, a virtual private LAN service (VPLS) network can be connected to an Ethernet VPN (EVPN) network using logical tunnel interfaces on the interconnection point of the VPLS and EVPN routing instances. In this case, the provider edge (PE) devices in each network are unaware of the PE devices in the other technology network. A solution is introduced for enabling staged migration from FEC128 LDP-VPLS toward EVPN on a site-by-site basis for every VPN routing instance. In this solution, the PE devices running EVPN and VPLS for the same VPN routing instance and single-homed segments can coexist. During the migration, there is minimal impact to the customer edge (CE) device-to-CE device traffic forwarding for affected customers.