Key Steps For Sub Interface Configuration on Cisco Switches | Quick Configs | IPCisco.com
Sub interfaces divide the parent interface into two or more virtual interfaces on which you can assign unique Layer 3 parameters such as IP addresses and dynamic routing protocols. The IP address for each subinterface should be in a different subnet from any other subinterface on the parent interface.
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Lesson: https://ipcisco.com/lesson/inter-vlan-routing-with-router-on-stick-topology/
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ip address