I have 2 switches connected by cat 5 and one 3745 also connected to the 2 switches. Now, what happens is I can ping an ip phone on the LAN, and then all of a sudden I can't. It just "dissapears"! If I go to the switch that the phone is connected to and do a "clear arp-cache" I can ping the phone again. This seems to happen every hour or so.
Without being there to troubleshoot, it seems as though you have a mac or ip address conflict. The symptoms you describe point to these. R U assigning macs or using the BIAs? How are you assigning IPs? Statically? DHCP?
The arp cache shouldn't matter to the switch unless it is layer 3 switching. In that case look at the cache first and see if the mac address is correct for the phone that should have the ip address. If not, figure out what device has the mac that is in the arp entry.
Thanks for replying, I located the problem. An old router was hooked up to the LAN (by my "new guy", he needs a little work). He was going through and testing old equipment we are selling and forgot to take it down. I got a message on our 3745 duplicate ip, and I knew something was fishy!!
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