To allow the PE and P routers to exchange routing information among themselves, you must configure an interior gateway protocol (IGP) on all these routers or you must configure static routes. You configure the IGP on the master instance of the routing protocol process (rpd) (that is, at the [edit protocols] hierarchy level), not within the VPN routing instance (that is, not at the [edit routing-instances] hierarchy level).
You configure the IGP in the standard way. This configuration example does not include this portion of the configuration.