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Cisco 1720 Device errors

Posted on 2006-06-13
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Last Modified: 2010-04-17
Hello,

I'm trying to track down the source causing errors on our cisco 1720 router.

here is a 'show int' from last week.

####

 Hardware is AmdP2, address is 0005.323e.8b60 (bia 0005.323e.8b60)
  Description: To Fatpipe WAN1
  Internet address is xxx.xxx.xxx.x/25
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 253/255, txload 1/255, rxload 7/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 283000 bits/sec, 34 packets/sec
  5 minute output rate 48000 bits/sec, 24 packets/sec
     317846449 packets input, 1650244085 bytes, 0 no buffer
     Received 135 broadcasts, 0 runts, 0 giants, 0 throttles
     133834 input errors, 202 CRC, 114 frame, 0 overrun, 133632 ignored
     0 input packets with dribble condition detected
     304437746 packets output, 623680803 bytes, 0 underruns
     133 output errors, 15344783 collisions, 2 interface resets
     0 babbles, 0 late collision, 5490407 deferred
     132 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

##########################################

Since this snapshot I have almost entirely stopped the collisions by adding int eth0/0 Full-Duplex.  The input errors are still persistent.  Any idea?  
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Question by:dosle
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Expert Comment

by:Don Johnston
ID: 16896923
How long has the device been up? (show version)

These counter have been incrementing since the router came up. You could do a "clear counters" and then "show interface" after 15 min or an hour to see if they're still occuring.
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by:dosle
ID: 16897128
here is the stats after i cleared the device @ 2pm cst:

####
Ethernet0/0 is up, line protocol is up
  Hardware is AmdP2, address is 0005.323e.8b60 (bia 0005.323e.8b60)
  Description: To Fatpipe WAN1
  Internet address is xxx.xxx.xxx.xxx/25
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 252/255, txload 25/255, rxload 14/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 00:23:37
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 576000 bits/sec, 120 packets/sec
  5 minute output rate 994000 bits/sec, 137 packets/sec
     180029 packets input, 101524266 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     4607 input errors, 4592 CRC, 2304 frame, 0 overrun, 15 ignored
     0 input packets with dribble condition detected
     206388 packets output, 184366062 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
####
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Expert Comment

by:mikebernhardt
ID: 16897551
>4607 input errors, 4592 CRC, 2304 frame

sounds like a cabling problem to me, or rarely, a port problem. Try checking/replacing the patch cables in between. If there's fiber, clean the ends.
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by:mikebernhardt
ID: 16897563
Could even be some bad EMF effects if the cabling is passing too close to an EMF source.
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by:Scotty_cisco
ID: 16898103
Check speed and duplex on both ends hard set them if necessary ... I would hard set them anyway but that is just me.

Thanks
Scott
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by:dosle
ID: 16898725
Scotty_cisco,

Good question.
I have looked into the duplexing speeds on the device this is plugging into, its autosensing according to the vendor.  Should i change anything on the 1720?

mikebernhardt,
I am going to make a fresh Xover cable to test if that will remedy the problem.

you'll hear from me soon,

thanks
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by:mikebernhardt
ID: 16898793
If one side is hard-set to full duplex, then both sides need to be hard set to full duplex. Otherwise the auto side will always set itself to half duplex. The full duplex side won't see collisions but the other side will get slammed with them.
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by:Scotty_cisco
ID: 16903256
the 1720 duplex is the only question from what I gathered your seed is 10Mb by ethernet 0/0 rather than having a fastethernet0/0 so in the 1720 under the interface you would want to see duplex full.  and then in the switch speed 10 duplex full if it is a managed switch if not then there is probably a step back that we need to look at.

Thanks
scott
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by:dosle
ID: 16903445
This is kind of an odd situation, to give you an idea of what's hooked up to the other side of this interface.  its a FatPipe Warp load balancing device.  We as the owners have no way to change the duplexing setting on each of the three WAN ports unfortunately.  I did have them change the FP Warp port this router is hooked up to from AUTO to FD.  This caused the link to stop working completely, even while the router configuration looks like;

!
interface Ethernet0/0
 description To Fatpipe WAN1
 ip address xxx.xxx.xxx.xxx 255.255.255.128
 full-duplex
 no cdp enable
!

So, I had them switch the FPWarp interface back to auto restoring the connection.  I'm not sure if I can set the router's interface to Auto.  Can either of you clarify?  

thanks, this is giving me some good insight.

m
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by:Scotty_cisco
ID: 16903585
If you put no full-duplex int the interface it should auto negotiate ... the problem I have seen is networking gear for whatever reason does not like to auto negotiate on a regular basis ... like fighting with your EX never works out in the end...

I would hard set both and then make the connection work but hard to do if you don't have controll of both sides.

Thanks
scott
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by:mikebernhardt
ID: 16904242
If you hard-set your side to half duplex then the other side will auto-set itself to half duplex also, because that's the default when there's no negotiation going on. You could try that and see what happens. At the very least, it will tell you if negotiation issues are the source of your errors.
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by:Scotty_cisco
ID: 16904264
it also depends what the auto negotiation defaults are on the switch usually 10 half is default but I have seen different on occasion so I would start there and then see what happens and if you can get the ISP involved that is what you pay them for and have them work with you on making sure that the connectivity is stable.

Thanks
scott
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by:dosle
ID: 16904448
I have talked to the provider for the FatPipe device, some interesting points:

1) when they switched it to FD it stopped collisions, but then the carrier errors increased (not sure what that means, havn't dealt with carrier errors)
2) switching it back to auto on the FPWarp stopped carrier errors and again increased collisions
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by:mikebernhardt
ID: 16904592
Any switch that doesn't default to half duplex when the other side isn't trying to negotiate should be thrown out, because it isn't meeting the IEEE standard.
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by:mikebernhardt
ID: 16904629
Like I said, try hard-setting your end to half duplex. Unplug the cable, then plug it in (to make sure the other side resets). Then monitor it. You WILL see some collisions, that's part of life with half-duplex. But if the other errors continue then it's probably a physical layer problem as I already suggested. Maybe it isn't on your end though.
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by:Scotty_cisco
ID: 16905942
Mike;

I would agree with you totally but does not mean that it isn't done with cheap switches is when I have usually seen the problem with auto negotiation and so yeah I usually do end up throwing them out and putting in real equipment.

Thanks
Scott
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Author Comment

by:dosle
ID: 17421126
We are getting a new cisco 2811 with csu dsu to resolve this problem.  the interface has been going downhill since this post.  thanks
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by:mikebernhardt
ID: 17421753
Great router, but a csu/dsu is for serial links, not ethernet. It does come with 2 ethernet ports though so it'll work fine.
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by:mikebernhardt
ID: 17739986
Well we talked a lot but didn't solve the problem...
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