Interfaces s0/s1 are not coming up on cisco 2500 Router

By imi6969
Apr 16, 2008
  1. Im trying to to set up cisco routers (2500 series) for CCNA studies but due to some reasons the serial interface s0/s1 are not coming up.

    Before assigning ip address ,clockrate at DCE interface and no shutdown commands the show interface command says the following:
    Serial0 is administratively down, line protocol is down
    Hardware is HD64570......

    And after ip address,clockrate,no shutdown command ,
    show interface reads like
    Serial0 is down, line protocol is down........

    show controller command does not show the type (DTE or DCE) interface.(as it shows in simulator)
    I changed the cables changed the routers (I have four) , reload the routers, even set back every thing to default factory default settings but nothing works.

    One thing I noticed that the led were off on all seria interfaces on all four routers but ethernet leds were flickering.
    Your professional advice/help would be highly appericiated.


    (I managed to configure the routers , completely in the simulator but not with real hardware)
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