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New Member

symbol errors

I now about symbols errors a gbics problem.

But I have PC connected to medai converters connected to ethenet ports fo/1 2 3 4 etc with sybols errors

what does that mean when I am getting symbol errors cat5 ports

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Gold

Re: symbol errors

H0ly-mackerel Batman!  Forget the symbols error.  Did you see the amount of collisions???  How long before the controller counters have been cleared?

13 REPLIES
New Member

Re: symbol errors

I read this however it is not clear

Small amounts of symbol errors can be ignored. what would be considered small %

Large amounts of symbol errors can indicate a bad device, cable, or hardware==  BAD device meaning switch or attached device

VIP Super Bronze

Re: symbol errors

What do you mean by symbol?

can you post the error?

what does "sh log" shows?

Reza

New Member

Re: symbol errors

>sh controllers eth f0/11

  Transmit FastEthernet0/11          Receive
1309854685 Bytes               3033939523 Bytes                   
110284581 Unicast frames        79758877 Unicast frames          
  52467486 Multicast frames        393493 Multicast frames        
  21875517 Broadcast frames        794561 Broadcast frames        
         0 Discarded frames             1 No dest, unicast        
         0 Too old frames               0 No dest, multicast      
    588022 Deferred frames              0 No dest, broadcast      
   3336954  1 collision frames
   1342151  2 collision frames       1942 FCS errors              
    230640  3 collision frames          0 Oversize frames         
     17168  4 collision frames          0 Undersize frames        
      1534  5 collision frames    6802891 Collision fragments     
       773  6 collision frames
       706  7 collision frames   68985261 Minimum size frames     
       670  8 collision frames    4198958 65 to 127 byte frames   
       578  9 collision frames    5201087 128 to 255 byte frames  
       300 10 collision frames    1259740 256 to 511 byte frames  
        69 11 collision frames    1013496 512 to 1023 byte frames 
         7 12 collision frames     306208 1024 to 1518 byte frames
         1 13 collision frames
         1 14 collision frames          0 Flooded frames          
         0 15 collision frames          0 Overrun frames          
         0 Excessive collisions         2 VLAN filtered frames    
         0 Late collisions              0 Source routed frames    
   3336954 Good (1 coll) frames         0 Valid oversize frames   
   1594598 Good(>1 coll) frames         0 Pause frames            
         0 Pause frames             64998 Symbol error frames     
         0 VLAN discard frames          0 Invalid frames, too large
         0 Excess defer frames          0 Valid frames, too large 
         0 Too large frames       6852013 Invalid frames, too small
  94125348 64 byte frames               0 Valid frames, too small 
  59822793 127 byte frames    
   4585668 255 byte frames    
   1805489 511 byte frames    
    622757 1023 byte frames   
  23665529 1518 byte frames  

VIP Super Bronze

Re: symbol errors

For start change the cable

New Member

Re: symbol errors

the cables were changed this is happening on several ports There is no network issues howerver these errors keep going up.

I am used symbol errors being a Gbic problem and after gbic is replace there going howerver these are happening on ethernet ports not fiber ports.

I am using media converter so PC cat5--media converter---------fiberrun--------------media converter--------cat5 to switch

tried auto auto and also hard code ports to 10 half

Hall of Fame Super Gold

Re: symbol errors

H0ly-mackerel Batman!  Forget the symbols error.  Did you see the amount of collisions???  How long before the controller counters have been cleared?

New Member

Re: symbol errors

They have never cleared switch has been up for 39 weeks

port is set at auto auto neg @10 half

13 input errors, 13 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 3492 multicast, 0 pause input
     0 input packets with dribble condition detected
     2498211 packets output, 1295703829 bytes, 0 underruns
     0 output errors, 172082 collisions, 0 interface resets

Hall of Fame Super Gold

Re: symbol errors

Thanks for the ratings.  Maybe you have duplex mismatch (can happen from a media converter) issue, perhaps?

New Member

Re: symbol errors

The media converter are passthrough so what comes in goes out there is now way to set them Only way is to hard code PC and switch.

Now when I get duplex mismatch I usally see Late  collisions but without having access to PC different dept...

Not sure what there settings are They should be auto atuo

The symbol error are happening on several ports not just this one so  I was wondering what can cause a symbol error besides bad hardware

Hall of Fame Super Gold

Re: symbol errors

I think the duplex mismatch is between the switch port and the nearest media converter.   You may want to check the dip switch of the the m/c because sometimes they are shipped with half duplex.

New Member

Re: symbol errors

these media converters Have no dip switches I know for a fact I have talked to there tech support to see if I could get the to neg at 10 full.

On way to have a duplex mismatch it The pc nic was hard coded at 10 full and my switch is at auto auto which it will neg at 10 half.

These media converter Do Not support Auto Negotiation

VIP Super Bronze

Re: symbol errors

Also, since you are using a media converter to go from copper to fiber, check the fiber side, if possible pull the connectors out, clean them and put them back(on both sides).  Some times the fiber connector get dirty and can cause issues.

New Member

Re: symbol errors

Cabling is not the issue Db loss from patch to patch is under 2.0 and we did run new fiber just to make sure This symbol errors happens on more then 1 port it is on several.

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