More about PE to VRF remote ping

For a PE to VRF remote ping, which is also known as a VRF-aware ping,
traces the topology to determine which VRF on the source PE to use to exchange routes with the destination VRF.
In VRF-aware remote ping, for example, when
initiates a PE2 to VRF1 remote ping,
determines that VRF4 exchanges routes with VRF1. Accordingly,
includes the VRF4 name as a parameter in the remote ping requests that it sends to PE2.
VRF-aware remote ping
For a PE to VRF remote ping,
instructs the source PE to ping all the IP addresses of the underlying interfaces that are associated with the destination VRF.