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How do you get a serial interface and line protocol to be up on a cisco router?

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I have two cisco routers connected with serial cables and they are being configured with a console cable. I set the ip address of both routers 192.168.1.1 255.255.255.0 192.168.2.1 255.255.255.0 and then run a no shut. I exit to exec mode and run a show interface and all I get is Serial is up, line protocol is down. How do I get the line protocol to also be up?

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  • tast_the_wine

    Your IP address are in a different address range. The address you need are:

    192.168.1.1 255.255.255.0 and on the other is, 192.168.1.2 255.255.255.0
    That makes 256 – 2 = 254 hosts in this range.

    Remember a class A is net.host.host.host
    class B is net.net.host.host
    class C is net.net.net.host

  • tony1athome

    The previous answer is correct, but is not enough to cause the problem that you’re seeing. More likely, there is a physical layer problem between the two interfaces. “debug serial” may well give you the help that you’re looking for.

  • Robb R

    Make sure that one side of the cable is DTE while the other side is DCE.

    Add the following command to the serial interface of both routers: ‘encapsulation ppp’

    Next, configure the clock speed on the router connected to the DCE end of the cable. ‘clock rate 64000′ Note that the speed can be adjusted…