Pipes are black for VPN connections. This can give the mistaken impression that something is wrong.
This is compounded by the fact that the topology tab for the link is not enabled and the user gets the error message:
Unable to Render Topology. There are no resolved connections.
Pipes are black by design for VPN connections because a VPN is a logical concept and not a singular device. To enable live pipes, the interfaces at both ends of the pipe need to be monitored and this is not possible with a logical concept such as a VPN or EVPN.
VPN managers are capable of monitoring the health of the connections to VPNs through the use of VFR Ping, path traces etc. Thresholds can be set that if exceeded will caused an event on the VPN. More details on managing your VPN manager are available in the document - CA Spectrum MPLS-VPN Manager User Guide in Chapter 5 under Managing VPNs.