Need help with cisco router output errors

bankadmin
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One of our remote locations called yesterday and they were completely offline (they connect with the data center via T1). I called the T-1 provider and he sent someone out on site, I couldnt connect to the router from data center his lines were up so I had him reboot the router and it didnt bring the connection back. I had him do that one more time and still it didnt come back up. Then he said the switch's (dell) lights were on steady so I had him pull the power and plug it back in and then the connection came back up. So now I'm thinking I need a new switch. I get a call today from the location and there down again. I didnt call the the t-1 provider I had an employee reboot the switch but it didnt come backup, I had her reboot the router two times I still couldnt connect so I had her reboot the switch one last time  and after that and there connection came back up. I checked the router after all of this and Im getting some errors on the fastethernet port connected to the switch (check the attachment). Any advice would be appreciated on wheather its a switch or router issue.
SS-router-output-errors.doc
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Steven CarnahanAssistant Vice President\Network Manager

Commented:
On the router do a "sh log" to see what errors you are getting

Author

Commented:
Syslog logging: enabled (0 messages dropped, 0 flushes, 0 overruns)
    Console logging: level debugging, 15 messages logged
    Monitor logging: level debugging, 0 messages logged
    Buffer logging: disabled
    Trap logging: level informational, 17 message lines logged
Top Expert 2012

Commented:
Hard to say which end is faulty - switch or router.
Any possibility you can plug into another port on the switch to see if it makes a difference?
Is it a managed switch? Can you check for errors on its side also?
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Steven CarnahanAssistant Vice President\Network Manager

Commented:
The switch should be on the inside interface of the router so the switch shouldn't be keeping you from reaching the router from your location.  Is the Dell switch a managed switch?  If so can you get to the logs on it?

The errors on the interface that stand out are the carrier loss and collisions.  Can you reset the stats on it and watch to see if the errors continue to increment?

Author

Commented:
Im not sure what the switch is I just know its a dell because thats what I was told I will need to get down there for that. I have been re-running show interface on the router and the counts have been going up, not very fast but they have been accumulating.
Steven CarnahanAssistant Vice President\Network Manager

Commented:
Can you browse to the switch IP? If it is a managed switch and http/https has not been disabled then you should get a web page. Another way to test without going there is with either Telnet or SSH (Putty).

Is the screen shot of the interface to the switch or out to your location?
Top Expert 2012

Commented:
Ah yes, I was sleeping! Sorry @pony10us is correct, switch shouldn't interfere with access from WAN side - unless there is a loop in the network?
Would this cause the router to hang up possibly?

Also - are you always able to access router remotely even though they are offline? Obviously you currently can access it - are they still offline? Or still having issues?

If you can access router remotely and they are offline then its a switch issue possibly, bar fastethernet on router is faulty...

Author

Commented:
I do have a spare router Im going to configure it and bring it down there and put in place and see what happens.
Robert Sutton JrSenior Network Manager

Commented:
Its one of two things....Either your switch is reaching its utilization max or its on its way out(Meaning its going bad and about to die). I would replace the switch and give it a day or two and see if the problem persists.

HTH,

|T|W|

Author

Commented:
I swapped out the dell switch with a brand new cisco switch and I also changed out ethernet that connects the router to the switch and IM still getting output errors. My assumption is that the port on the router itself is going bad. Any other ideas?
Robert Sutton JrSenior Network Manager

Commented:
Can you post the errors here? Just the recent ones after swapping out the older equipment.
Senior Network Manager
Commented:
Ok, Im going to go out on a limb and say that you're simplexing is set incorrectly. I see you have 100 half-duplex set on that interface. Try setting that interface to FULL duplex and clear the interface counters. Collision errors typically derive from either a speed or simplex mismatch.

Also, can you please describe what port this connects to? You displayed an output from an ethernet port. Im curious where or what this connects too? Or, maybe just atteach a simple diagram.

Let us know.

HTH,

|T|W|
Steven CarnahanAssistant Vice President\Network Manager

Commented:
I agree with The_Warlock.  Change the setting to full duplex.  

"Full-Duplex Operation 10/100/1000
...Full-duplex mode allows stations to transmit and receive data simultaneously. This makes for more efficient use of the available bandwidth by allowing open access to the medium. Conversely, this mode of operation can function only with Ethernet switching hubs or via Ethernet cross-over cables between interfaces capable of full-duplex Ethernet. Full-duplex mode expects links to be point-to-point links. There are also no collisions in full-duplex mode, so CSMA/CD is not needed."

http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1904.html

Author

Commented:
I set it to full duplex yesterday so far so good no more errors. I will wait a couple of days just to verify before I close this question
Robert Sutton JrSenior Network Manager

Commented:
Glad to hear no more errors are coming in. Let us know.


|T|W|

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