Hello,
use "telnet 10.1.1.1 /vrf VRFname" or even "10.1.1.1 /vrf VRFname".
Make sure the IP address of the PE inside the VRF VRFname is announced through IP routing inside the VRF.
Just sidenote: other useful troubleshooting commands are:
ping vrf VRFname ...
traceroute vrf VRFname ...
Hope this helps! Please rate all posts.
Regards, Martin