How do devices operate in an MPLS L3VPN topology?

In an MPLS L3VPN topology, Provider (P) routers are core routers that perform high-speed MPLS label switching. Their primary role is to forward MPLS packets between Provider Edge (PE) routers, effectively creating the backbone for VPN connectivity. P routers do not maintain customer VPN routing information (VRFs); they only need to know how to reach other PE routers using MPLS. Incorrect options: P and PE routers running an IGP populate VRF routing tables across VPNs: P routers do not populate VRF routing tables; only PE routers do. CE routers attach to the provider network and perform LSP functions: Customer Edge (CE) routers are customer-owned and do not perform Label Switched Path (LSP) functions, which are MPLS provider-network specific. P routers enable PE-to-PE VPN connectivity without using LSPs: P routers explicitly use LSPs to forward traffic between PE routers.