the route example works for all routers except the one, where the VRF vpn2 is configured. What you can do for management purposes is either to connect through a neighbor router using packet leaking or configure another Loopback into VRF vpn2.
The last option (and my recommendation) is to establish another separate IP connection from your NMS to the MPLS core. Once VRFs are failing (for whatever reason, f.e. erroneously deleted) you might just not get connectivity to your backbone anymore to repair what went wrong.
So I would create an "interconnection router" with an interface in the VRF vpn2 and one interface in global IP routing table. This way you will still be able to access PEs, even if VRFs or MBGP is gone.
I can only imagine your Collector connected to the PE either directly or via a CE (!). In either case, I do not see how traffic can reach the Collector if the static route is pointed to Loopback0? with this logic the static route should be pointed to either a physical interface, subinterface or VSI
You also need to make sure reachability is advertised beyond the CE and/or PE where applicable
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