I am finding conflicting info among cisco documentation for the acceptable threshold of collisions on a ethernet segment. A CCDA question was that the Cisco standard for collisions was .1% of total throughput. Divide collisions by packet output to arrive at this number. Assuming that there is no collisions on full duplex, this must therfore apply to 1/2 duplex operation.
CCO on the issue says that "collisions do not constitute a problem". "In conclusion, the collisions counter does not provide a very useful statistic to analyze network performance or problems. " http://www.cisco.com/warp/public/63/eth_collisions.html.
The former seems like the most logical, but I have interfaces in the network I support clocking 12% collisions per the equation above, and there is not users complaining of latency on these segments. I have seen interfaces communicating with a duplexing mismatch go above 30% collisions and it is my belief that the 12% segments are set correctly. I should also add that these segments are connected to a baystack switch, so i think this could be the cause.
What is the standard that you use for this?