unnumbered interfaces in routing information ?

Discussion in 'Cisco' started by Evgeny Vainerman, Jan 15, 2004.

  1. Let's assume two devices are connected by p2p link via unnumbered
    interfaces:

    |=====| |=====|
    | | Ser0 | |
    | A 0-------------------0 B 0-----Network 10.0.3.0/24
    | | Ser0 | |
    |=====| |=====|

    Both interfaces are unnumbered and each one shares the IP address with
    the device's loopback.

    A's loppback is 10.0.1.1/24
    B's loopback is 10.0.2.1/24

    How does routing table od router A look like ?

    S 10.0.3.0 [1/1] via 10.0.2.1, Serial0 ?

    Would I see network 10.0.2.0/24 as a connected ?

    C 10.0.2.0/24 is directly connected, Serial0 ?

    Thanks, Evgeny.
     
    Evgeny Vainerman, Jan 15, 2004
    #1
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  2. It depends on your configuration. If you do the following configuration
    on router A
    ip route 10.0.3.0 255.255.255.0 serial0
    and using HDLC as encapsulation on the serial line

    then the routing table will look like this:

    C 10.0.2.0/24 is directly connected, loopback0
    S 10.0.3.0/24 is directly connected, Hssi0/0

    If you use PPP as encapsulation on your serial lien the router A will
    learn the IP address of the neighbor router as a host address. The
    routing table will look like this:

    C 10.0.2.0/24 is directly connected, loopback0
    S 10.0.3.0/24 is directly connected, serial0/0
    S 10.0.2.1/32 is directly connected, serial0/0


    Evgeny Vainerman schrieb:

    > Let's assume two devices are connected by p2p link via unnumbered
    > interfaces:
    >
    > |=====| |=====|
    > | | Ser0 | |
    > | A 0-------------------0 B 0-----Network 10.0.3.0/24
    > | | Ser0 | |
    > |=====| |=====|
    >
    > Both interfaces are unnumbered and each one shares the IP address with
    > the device's loopback.
    >
    > A's loppback is 10.0.1.1/24
    > B's loopback is 10.0.2.1/24
    >
    > How does routing table od router A look like ?
    >
    > S 10.0.3.0 [1/1] via 10.0.2.1, Serial0 ?
    >
    > Would I see network 10.0.2.0/24 as a connected ?
    >
    > C 10.0.2.0/24 is directly connected, Serial0 ?
    >
    > Thanks, Evgeny.
     
    Helmut Ulrich, Jan 15, 2004
    #2
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