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From: Peihai Wang (WangpeihaiHUAWEI.COM)
Date: Mon Apr 16 2001 - 20:57:27 CDT

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    Hi.
    I am a newcomer for OSPF. And I have trouble during study.
    The following figure show a simple AS.
    .................. .................. ..................
    . A2 . . A1 . . A0 .
    . . . . . (Backbone) .
    . ------ ------ ------ .
    . ----| R3 |----| R2 |----| R1 |---- .
    . ------ ------ ------ .
    . . . . . .
    .................. .................. ..................
    Now, suppose that virtual link has not been configured between R3 and R1,
    i.e., the backbone is disconnected. My question is:
    Is R3 an area border router? a backbone? belong to backbone area?
    Is a router an area border router if only it attachs to multiple areas?
    i.e., what's condition of becoming area border router?

    It is very easy for you to clarify. Thanks for your help!