I have a network consisting of 2 4500's and 16 or so 3750's. The network has 12 or so VLAN's and a few hundred devices. The 4500's do all inter VLAN routing. I had a computer that had become intermittent on the network when contacted from a different subnet (would answer 30-50% of pings) but was fine on the local subnet. I checked the ARP cache on the 4500 and the IP/MAC info was correct. I chased down the MAC in the CAM and that was correct also. As soon as I deleted the ARP entry, the problem cleared up.
We believe this problem has happened several times over the past few weeks on different computers.
Can anyone explain why a seemingly correct ARP entry would cause this intermittent problem?
Thanks in advance