OSPF routing Loop

Discussion in 'Cisco' started by Cuang-liang Dai, Feb 7, 2004.

  1. Dear all:
    I meet a problem. In our network, we use netmask /22 bit, Cisco 6513 ,OSPF.

    I don't know why it always has a 24 bit subnet routing entry in all router to cover my setup. i.e, I use 10.34.116.0/22 in 6513 Native IOS router, but it always be coverd from that router having a 10.34.116.0/24 subnet.

    The 10.34.117.0, 10.34.118.0, 10.34.119.0 segment is ok, 10.34.116.0 is fail. it run under loop :(, We check that all router, without 10.34.116.0/24 subnet.
    But it always exist and replace my local config and static route.

    What is the happen ? How to clear that bad entry ?
    Cuang-liang Dai, Feb 7, 2004
    #1
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  2. Cuang-liang Dai

    Bob Sinclair Guest

    Pardon me if I do not understand your problem, but...

    You say that you use a /22 mask, but the 117, 118 and 119 subnets must be
    using a /24 mask. 116/22 is a summary for 116/24, 117/24, 118/24 and
    119/24.

    Can you give more details?

    --
    Bob Sinclair
    CCIE #10427, CISSP, MCSE
    www.netmasterclass.net

    "Cuang-liang Dai" <> wrote in message
    news:c03spf$2sk7$...
    > Dear all:
    > I meet a problem. In our network, we use netmask /22 bit, Cisco 6513

    ,OSPF.
    >
    > I don't know why it always has a 24 bit subnet routing entry in all router

    to cover my setup. i.e, I use 10.34.116.0/22 in 6513 Native IOS router, but
    it always be coverd from that router having a 10.34.116.0/24 subnet.
    >
    > The 10.34.117.0, 10.34.118.0, 10.34.119.0 segment is ok, 10.34.116.0 is

    fail. it run under loop :(, We check that all router, without 10.34.116.0/24
    subnet.
    > But it always exist and replace my local config and static route.
    >
    > What is the happen ? How to clear that bad entry ?
    Bob Sinclair, Feb 8, 2004
    #2
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  3. Cuang-liang Dai

    micke Guest

    hey should not the virtual-link be to or from router B and NOT A to
    the backbone router

    All routers that interconnect areas has to be a part of backbone

    /micke

    "Bob Sinclair" <> wrote in message news:<5qsVb.2982$Yj.2449@lakeread02>...
    > Pardon me if I do not understand your problem, but...
    >
    > You say that you use a /22 mask, but the 117, 118 and 119 subnets must be
    > using a /24 mask. 116/22 is a summary for 116/24, 117/24, 118/24 and
    > 119/24.
    >
    > Can you give more details?
    >
    > --
    > Bob Sinclair
    > CCIE #10427, CISSP, MCSE
    > www.netmasterclass.net
    >
    > "Cuang-liang Dai" <> wrote in message
    > news:c03spf$2sk7$...
    > > Dear all:
    > > I meet a problem. In our network, we use netmask /22 bit, Cisco 6513

    > ,OSPF.
    > >
    > > I don't know why it always has a 24 bit subnet routing entry in all router

    > to cover my setup. i.e, I use 10.34.116.0/22 in 6513 Native IOS router, but
    > it always be coverd from that router having a 10.34.116.0/24 subnet.
    > >
    > > The 10.34.117.0, 10.34.118.0, 10.34.119.0 segment is ok, 10.34.116.0 is

    > fail. it run under loop :(, We check that all router, without 10.34.116.0/24
    > subnet.
    > > But it always exist and replace my local config and static route.
    > >
    > > What is the happen ? How to clear that bad entry ?
    micke, Feb 10, 2004
    #3
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