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Role of sub-interfaces

Discussion in 'General Cisco Certifications' started by sendalot, Feb 25, 2013.

  1. sendalot

    sendalot Nibble Poster

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    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?

    Thanks.
     
    WIP: A+
  2. danielno8

    danielno8 Gigabyte Poster

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    There are many use cases, one example would be to use one physical interface on a router, to provide inter-VLAN routing (google router on a stick). Each sub-interface can be a member of separate VLAN's, with the interface physically connected to a trunk port on a switch.
     
    Certifications: CCENT, CCNA
    WIP: CCNP

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