More than one million Layer 3 VPN labels

For Layer 3 VPNs configured on Juniper Networks routers, Junos OS normally allocates one inner VPN label for each customer edge (CE)-facing virtual routing and forwarding (VRF) interface of a provider edge (PE) router. However, other vendors allocate one VPN label for each route learned over the CE-facing interfaces of a PE router. This practice increases the number of VPN labels exponentially, which leads to slow system processing and slow convergence time. For Juniper Networks routers participating in a mixed vendor network with more than one million Layer 3 VPN labels, include the extended-space statement at the [edit routing-options forwarding-table chained-composite-next-hop ingress l3vpn] hierarchy level. The extended-space statement is disabled by default.