A service provider plans on implementing IPv6 using 6PE. What are two drawbacks of the 6PE approach? (Choose two.)

P routers in a 6PE network run only IPv4 and MPLS and have no IPv6 stack, so they cannot originate ICMPv6 messages such as Time Exceeded responses during traceroute, making troubleshooting and path visibility across the MPLS core difficult.

6PE assigns one MPLS label per IPv6 BGP prefix (per-prefix allocation), meaning the label forwarding table on PE routers grows proportionally with the IPv6 BGP routing table, which becomes a scalability concern as the internet IPv6 table expands.

Separate RIBs and FIBs per customer are required for MPLS L3VPN (6VPE), not 6PE; 6PE is designed for shared IPv6 connectivity over a common MPLS core without per-customer VRF separation.

Non-disruptiveness is actually a primary advantage of 6PE because P routers require zero IPv6 configuration changes, making 6PE one of the least disruptive methods to introduce IPv6 into an existing MPLS network.