Refer to the exhibit. ISP A provides MPLS L3VPN service to customer A with BGP as the external routing protocol. Customer A has just opened a new branch office in London and requested the service…

LDP is already working, and simply redistributing EIGRP routes does not address the synchronization issue between IGP and LDP for MPLS transport.

Configuring BGP address family VPNv4 is a core part of setting up L3VPNs, but the question implies L3VPN service is already provided and focuses on making it 'lossless,' which points to the underlying MPLS transport layer's stability.

Redistributing BGP routes into IGP in the core is generally not a standard practice for basic MPLS L3VPN operations and does not solve the IGP-LDP synchronization problem.

Configuring IGP LDP synchronization on the interfaces running both IGP and LDP is crucial for achieving lossless service in an MPLS L3VPN. This feature prevents an IGP from advertising a route to a neighbor until the LDP session with that neighbor is fully established and labels have been exchanged, thereby eliminating transient blackholing of traffic that can occur during IGP-LDP convergence mismatches.