OSPF Stub area question re: Default Routes

Discussion in 'Cisco' started by jimbo, Jun 18, 2005.

  1. jimbo

    jimbo Guest

    SETUP: When an OSPF area type is configured as STUB, then only a
    default route will be advertised into the stub area by the Area Border
    Router. No ASBRs or external routes will be advertised. FINE. But what
    if there are two links connecting the stub area to area 0, meaning the
    stub area has two ABRs. Furthermore, suppose one of those ABRs has a
    shorter path to the ASBR (i.e. lower metric).

    QUESTION: When each ABR advertises a default route into the stub area,
    will the routers pick the default route with the lower metric? If not,
    how will the stub areas routers choose from among the two candidate
    default routes?

    Thanx!
    Jim
    jimbo, Jun 18, 2005
    #1
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  2. jimbo

    John Agosta Guest

    The internal routers will choose the default route pointing to the ABR with
    the lowest cost,
    from there, the ABR routes accordingly.


    "jimbo" <> wrote in message
    news:...
    > SETUP: When an OSPF area type is configured as STUB, then only a
    > default route will be advertised into the stub area by the Area Border
    > Router. No ASBRs or external routes will be advertised. FINE. But what
    > if there are two links connecting the stub area to area 0, meaning the
    > stub area has two ABRs. Furthermore, suppose one of those ABRs has a
    > shorter path to the ASBR (i.e. lower metric).
    >
    > QUESTION: When each ABR advertises a default route into the stub area,
    > will the routers pick the default route with the lower metric? If not,
    > how will the stub areas routers choose from among the two candidate
    > default routes?
    >
    > Thanx!
    > Jim
    >
    John Agosta, Jun 18, 2005
    #2
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  3. jimbo

    jimbo Guest

    Understood. Thanx
    jimbo, Jun 20, 2005
    #3
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