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From: Moy, John (John.MoySYCAMORENET.COM)
Date: Thu Apr 19 2001 - 13:43:22 CDT

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    The definition of an area border router
    is one that is actively connected to two or
    more areas. In your picture, R3 *is* an
    area border router.

    Similar issues have been discussed a lot
    on this list in the past. Search the archives
    http://discuss.microsoft.com/archives/ospf.html
    for "area border" and you'll see many hits.

    John

    -----Original Message-----
    From: Peihai Wang [mailto:WangpeihaiHUAWEI.COM]
    Sent: Monday, April 16, 2001 9:57 PM
    To: OSPFDISCUSS.MICROSOFT.COM
    Subject: What's condition of becoming area border router?

    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!