To get right to it;
We have two routers (in Brazil if it matters) connected via frame relay. The ignored count on each serial interface keep increasing although not at a fast rate. The input errors / CRC errors / frame errors / aborts do not increase on either router. We had the carrier test the circuits on both routers the other day and that really increased the input errors / CRC errors / frame errors / aborts as well as the interafce resets and carrier transitions. (less that 100 input errors went to 533731 / 0 CRC errors went to 125154 / 64 aborts went to 211460 on one of the routers...the other end saw an increase in those same stats as well but not that extreme). Now, focusing on the router with the largest increase in errors, based on framing errors, aborts, carrier transitions and interface resets, I was thinking that the (external) CSU or the cabling between the (external) CSU and the demarc may be the issue.I had to make a choice as to which cable the carrier tech was going to check (demarc ext. or V.35) since we had a time limitation. I chose the demarc extension since those seem more prone to errors than a V.35 cable.
The carrier claims there is nothing wrong with the demarc extention, or smartjack and they swapped CSU's on both sides. Today I look at the interface stats again, and the only thing that has increased (since Monday) in the "ignored" count.
Early on, when I first noticed this, the only problem with the interface stats was the 'ignored" count, and some research led me to the buffers. While the buffers showed some failures, they all showed "0 no memory" which led me to believe that while more buffers were required at times, the router never ran out of memory.
At this point, I'm a bit stumped as to where to look next. Both routers have an increasing "ignored' count, so that leads me to believe it is *not* the routers themselves, but the circuit although even that has separate components. Should I be looking at both routers as one? (Meaning errors on one side will show up on the other?). Go back to the carrier? I'm not sure what to ask them at this point.
I'm happy to post any info from the routers that somebody thinks would be relevant. I didn't post anything now since I don't know what anybody would want to see.
OK...I think that's enough for now.
Perhaps you could remove the extended demarc(s) from the picture.
Perhaps a known good spare router and related equipment directly at the demarc.
If you cannot ensure the correct extended demarc cables and shielding was used, narrowing the link will help rule out unknowns.
Incorrect, "ignores" indicate that router is too busy and could not process packets fast enough. It never indicates a problem with circuit.