Configure router-on-a-stick inter-VLAN routing
Steps:

Switch Configuration
1. Create and name the VLANs
a. VLAN 10 Client
b. VLAN 20 Server
c. VLAN 99 Management
2. Configure access ports connecting to PCs in VLAN 10 and 20
3. Configure Trunk ports connecting to Router and Switch in VLAN 10,20 and 99
Router Configuration
4. Create a sub interface for each VLAN to be routed using two commands:
a. encapsulation dot1q vlan_id
b. ip address ip-address subnet-mask

Part 3 - Inter vlan routing using multilayer switch
https://youtu.be/sX9xY4t9Auk