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