- Written by Satish Mahadevan
- Posted on April 21, 2015
- Updated on December 20, 2024
- 4397 Views
Subinterfaces are logical L3 interfaces that enable the division of a single Ethernet or Port-channel interface into multiple logical L3 interfaces based on the incoming 802.1q tag. They are commonly used in the L2/L3 boundary. They can also be used in the context of VRF-lite, by configuring each subinterface in a different VRF.