I've got a site that, up until last week, was fine. Since then, we're losing ping requests and users have complained of slow connectivity to the Internet (the net server is housed here - off-site). The PVC's are showing as active, yet I'm concerned about the number of Giants on the serial interface (see below). The telco are saying that the PVC's are fine (obviously!) but as far as I can see everything looks OK. Any ideas?
Hi there, the first thing I would do is clear out the counters on this interface and look at it while trying to access the sites that you are having an issue with. From what you posted up I see alot of input and CRC errors. This can be several things, but mostly comes down to the physical level like a bad wire. Now it can be anywhere from inside your telco provider all the way to your hand-off or even in rare situations your CSU/DSU on your router. What I would suggest in doing is clearing out the counters while having your telco provider on the phone monitoring Try to access the sites you are having diffculties reaching they will be able to see if your traffic is comming across their network clean or with errors. At the same time do a show int ser 0/0 and take a look at the input and crc errors see if they are going up. If they are I would suggest in having your telco provider come out and running a test from your drop and seeing where the error is at. Once again I do state that it may not be on their end and in the CSU/DSU but the amount of errors that I see in the document you provided does show that it might be a physical issue on the line. I went thru the same situation with a remote site of mine and it was a bad pair of wires leading to my smart-jack. - Ed
If this is your internet connection I would turn CDP off. Its just wasting bandwidth. Previous post about clearing counters and watching again is important to prove/disprove physical layer problems. After that I have to wonder who you are pinging. If its into the internet that can be unreliable and at many sites is blocked. To isolate and test the link just try to ping the other side of the link from the router on your end of the link. If it has problems and you dont see errors on your end you need to know whats happening in the router at the other end.
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