I'm looking for suggestions on troubleshooting a link to our datacenter that has intermittent connectivity and speed issues. The link to the datacenter is approximately 30 miles in distance so even on a good day there is 3-4ms of latency. At this point I'm not too familiar with the setup as I've inherited this from a previous employee without much documentation. I know at this point the link is connected between a 2970 and a 3750. Both interfaces are set as auto and are showing fd 1000mbs. The link is a layer 2 100 mb and somewhere in between goes through our providers switchgear. I only figured this out due to some vlan issues. I'm not sure if this is an issue but the 2970 shows 12056 big buffer misses for today. This is interesting as hardly any of the other switches show any buffer misses. The site has approx. 150 machines accessing the datacenter over the 100mb line ranging from email, terminal services, web, etc... I would appreciate if anyone could help in troubleshooting this issue. I can post configs or provide any other info if needed. I appreciate the help.