In 6PE networking, the shared explicit null label function can be enabled on routers to...

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In 6PE (IPv6 over MPLS for Provider Edge), the shared explicit null label value is 0. When this function is enabled, the PE router assigns label 0 (IPv4 Explicit Null) to all IPv6 routes, reducing the label space consumption. This is known as label 0 reuse for IPv6 forwarding over MPLS.

Exact Extract - HCIE-Datacom IPv6/MPLS Integration Section:

“To optimize label usage in 6PE deployments, shared explicit null label (label 0) can be assigned to all 6PE routes.”