Role of sub-interfaces

sendalotsendalot Posts: 328Member
What is the role of a sub-interface?

Say we are configuring OSPF on a router.

Then we have fa 0/0.1 or fa 0/0.2.

What are those for? Why can't we just use regular interfaces?



  • Node ManNode Man Posts: 668Member ■■■□□□□□□□
    im new to this, i believe sub interfaces are for VLAN trunking.
  • networker050184networker050184 Posts: 11,962Mod Mod
    Sub interfaces are to break a physical interface into multiple logical units. VLANs are one such use as Node Man pointed out.
    An expert is a man who has made all the mistakes which can be made.
  • earweedearweed Posts: 5,192Member ■■■■■■■■■□
    If configuring router on a stick sub-interfaces are used. I hadn't heard of them or used them until configuring ROAS.
    No longer work in IT. Play around with stuff sometimes still and fix stuff for friends and relatives.
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