January 6 2009

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

Posted by feed Under Computer Networking 3 Comments » |

frnk8 m asked:

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?

Maintain home network

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Tags: 192 168 1 1, 192 168 2 1, cisco routers, Configured, Serial Cables, Serial Interface

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

1. tast_the_wine says:

   January 8, 2009 at 11:48 am

   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
2. tony1athome says:

   January 10, 2009 at 9:07 pm

   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.
3. Robb R says:

   January 13, 2009 at 9:16 am

   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…