What is a Subinterface in a Cisco Router - Snabay Networking
Example for Configuring Sub-interfaces to Implement Inter-VLAN Communication - AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S CLI-based Typical Configuration Examples - Huawei
Inter-VLAN Routing | CCNA Blog
Policy route-map / Sub-Interfaces
Configuring InterVLAN Routing & SVI Interfaces
How To Configure Router On A Stick - 802.1q Trunk To Cisco Router