Michael, Shot in the dark - I've seen very strange issues like this with trunk mismatches. You've probably got a trunk between the two switches. Make sure your native VLANs match, make sure that every VLAN permitted on the trunk is permitted on both sides. On a similar vein, all trunk ports should have similar characteristics (I go with 100, full, desirable trunking, desirable channeling; regardless, just make sure it's the same both sides)
Also, if you've got links bundled, try bringing down one of the links for a bit, then try the other(s). Switches load balance via MACs, if you've got a uni-directional link or something, packets from the same machine will usually transit the same wire every time - physical port/cable problems might appear to be associated with only certain machines because of this. Best guess for now. Good luck! --Wes Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=47964&t=47951 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]