This is not the right move.   "ASR1001-X built-in 10 GE ports are turned on using port-based licenses. However, if the ASR1001-X is upgraded to 20G, then the two built-in ports are automatically included."   So, if you buy the FLSA1-1X-2.5-20G licens...

The Cisco ASR 1001-HX Router has eight 1GE SFP ports in Bay 0 and eight 1GE SFP or 10GE SFP+ ports in Bay 1 . By default, four ports in Bay 0 and four ports in Bay 1 can be enabled without a license (ports 0 through 3). The remaining ports can be ena...