06-14-2007 06:44 AM - edited 03-05-2019 04:43 PM
I have a trouble with keeping the interface UP.
I need that Serial interface should be UP.
So I use the following commands:
cisco>enable
cisco#config t
cisco(config)#interface serial 0
cisco(config-if)#ip address 192.168.199.10 255.255.255.0
cisco(config-if)#clock rate 64000
cisco(config-if)#no shutdown
Now when I shoot these commands below:
cisco(config-if)#exit
cisco(config)#exit
It then shows Serial Down.
What am I doing wrong. What do I need to make this interface UP.
Cheers
06-14-2007 07:07 AM
Down and shutdown are 2 different things...
Do you have an active connection plugged into the serial interface? Also, if you do a sh int s0 does it show up/down or down/down?
The interface will always be 'down' if nothing is plugged into it.
HTH,
Paul
06-14-2007 07:07 AM
How is the other side configured ?
You are entering the clock rate, so I assume this interface is the DCE side ?
You can verify this by issuing:
sh controllers s0/0 | i DCE|DTE
If it's a DTE, you don't need a clock rate command.
You must also match the encapsulation between the 2 devices.
Currently, you are running the default - HDLC.
06-14-2007 07:38 AM
What type of Serial connection is this? It looks like an in-house line since you are providing clock. Does your line come from the carrier? If so they are most likely providing a clock source for it. Also can you provide a SHOW INTERFACE SERIAL 0 results for us to look at. Do you have all your control signals from your DCE equipment???
06-14-2007 08:03 AM
Router#show interface serial 0
Serial0 is down, line protocol is down
Hardware is HD64570
Internet address is 192.168.199.10/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/0/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 8 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=down DSR=down DTR=down RTS=down CTS=down
I use Console cable to connect to the router
06-14-2007 08:04 AM
The router is connected to my computer
06-14-2007 08:06 AM
The serial interface needs to connect to another serial interface device, until then - the interface will be down/down.
06-14-2007 08:09 AM
Since you are supplying clock from the interface and you also do not show any control signals up (from your show interface serial command). Make sure you have the correct cable off the router. It must be a DCE. Also may I ask why are you sending a serial connection to your computer? Is this some special application??
06-14-2007 08:30 AM
I am just practising some cisco commands by connecting my pc with the router ..
I am using HyperTerminal as a terminal interface program
06-14-2007 08:33 AM
That's a console connection, interfaces on a router will only go up if you connect a device at the other end.
On this case, you need another router and a serial cable between the two.
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