Hi,
There is no such limitation. You can terminate the subscribers in VR/VRF.
show subscribers summary all
Subscribers by State
Init: 54
Configured: 2
Active: 37116
Terminating: 8
Terminated: 3
Total: 37183
Subscribers by Client Type
DHCP: 539
VLAN: 18701
PPPoE: 17943
Total: 37183
Subscribers by LS:RI
default: 18701
default:test.in: 14628
Regards,
Rahul