09-09-2010 03:28 PM - edited 03-04-2019 09:43 AM
Hello, I am learning computer networking but am having a little trouble. I purchased 2 2610 routers, 2 4 a/s network modules, and 2 1ft serial DCE/DTE crossover cables. My problem; When I setup the interfaces on one router the status goes up and line prot goes up but after a few seconds the line prot goes down. On the second router, it stays down no matter what. I did a sho controllers and it is showing a v.35 cable (DTE and DCE). Any suggestions would be helpful.
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09-09-2010 05:52 PM
Rob,
Your configuration looks good. What stands out as being troublsome follows:
From the show int:
Router_DTE>show int ser1/1
Serial1/1 is up, line protocol is down
Last input never, output 00:00:09, output hang 00:04:19
Output hangs:
output hang | Number of hours, minutes, and seconds (or never) since the interface was last reset because of a transmission that took too long. When the number of hours in any of the last fields exceeds 24, the number of days and hours is printed. If that field overflows, asterisks are printed. |
This is also backed up from the show controllers for the same interface:
Router_DTE>show controllers ser1/1
CD2430 Slot 1, Port 1, Controller 0, Channel 1, Revision 19
Channel mode is synchronous serial
idb 0x815D0420, buffer size 1524, V.35 DTE cable
Transmitter hang count 450
I'm gonna guess that you may have a faulty module or cable.
Chris
09-09-2010 03:49 PM
On the router with the DCE interface did you configure the 'clock rate' command?
Something like this:
inter ser 0/0
clock rate 56000
exit
This link goes into more detail:
http://www.cisco.com/en/US/docs/ios/11_2/feature/guide/clkrate.html
Chris
09-09-2010 03:56 PM
09-09-2010 04:28 PM
I believe this link describes your situation:
http://www.cisco.com/en/US/tech/tk713/tk317/technologies_configuration_example09186a00800944ff.shtml
If thats not helpful please post 'show controllers' and 'show run'.
Chris
09-09-2010 05:11 PM
09-09-2010 05:52 PM
Rob,
Your configuration looks good. What stands out as being troublsome follows:
From the show int:
Router_DTE>show int ser1/1
Serial1/1 is up, line protocol is down
Last input never, output 00:00:09, output hang 00:04:19
Output hangs:
output hang | Number of hours, minutes, and seconds (or never) since the interface was last reset because of a transmission that took too long. When the number of hours in any of the last fields exceeds 24, the number of days and hours is printed. If that field overflows, asterisks are printed. |
This is also backed up from the show controllers for the same interface:
Router_DTE>show controllers ser1/1
CD2430 Slot 1, Port 1, Controller 0, Channel 1, Revision 19
Channel mode is synchronous serial
idb 0x815D0420, buffer size 1524, V.35 DTE cable
Transmitter hang count 450
I'm gonna guess that you may have a faulty module or cable.
Chris
09-09-2010 07:20 PM
Thanks Chris. Is it normal that I can get the interface to go up on the DTE router and not on the DCE router, even if the module or cable is faulty? I have tried 3 different cables, though they were all from the same ebay seller. Anything else I could try to narrow it down? Thanks for everything.
Rob
09-09-2010 08:58 PM
Rob,
It's not typical to see a failure in regard to the The 4-port (NM-4A/S) or the DTE/DCE cable; perhaps just bad luck.
It's not uncommon to see an interface be in a 'line up; protocol down' state when there is a layer one or layer two problem.
Chris
09-10-2010 05:26 AM
Thanks for all your help Chris. Yeah, that is usually my luck...bad.
09-18-2010 04:42 PM
Hi Chris, Well it turns out it was the network module. I borrowed one from a friend and she fired right up. Thanks for your help!
Rob
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