In my experience symbol errors are a problem associated with physical layer problems. The symbol error represents a failure to read data correctly from the media.
Given what you have shown it is difficult to establish whether this is a serious problem or not. I see that the count of symbol errors is 621445 and the number of input packets is 234005239 and that ratio seems pretty high. But I also notice that the interface counters were cleared 2 weeks and 3 days ago. I am not sure whether clearing the interface counters also clears the symbol error count or not. If it does clear then the ratio is high and you probably have a problem that needs attention. If the symbol count is over a longer period of time then it is difficult to know how serious the problem is.
I would suggest that you clear the interface counters again. And then look for the symbol error counter. If it was reset to zero then you probably do have a problem. If the symbol error count was not reset then it is hard to tell the significance of your issue. (but any symbol errors is not a good thing)
Thanks for confirming that clear counters on the interface also clears the count of symbol errors. It means that the observed ratio of symbol errors to input data is meaningful. And it seems to me that a ratio as high as is observed on your machine indicates that there is a problem in the network.
Symbols have to do with how data in encoded on the fiber. And a symbol error indicates a failure to correctly read data from the fiber. In my experience the symbol errors indicates a problem in the network at layer 1 - usually a probem in cabling.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.