cisco - Can not create sub-interface like `interface gigabitEthernet 2/1.100` - Network Engineering Stack Exchange
Configuring Layer 3 Interfaces
What is a Subinterface in a Cisco Router - Snabay Networking
Solved: How to configure routing like this using subinterface - Cisco Community
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
How to Configure Inter-VLAN Routing | SYSNETTECH Solutions