I've been getting these intermittent errors from DCFM which look something like this.
Data Center Fabric Manager Version: 10.4.5 Data CenterFabric Manager Build: 3 Data Center Fabric Manager Server Address: 10.6.236.122
Date: Tue Jan 29 03:10:13 EST 2013
Event: Switch reachable. It had gone unreachable at1/29/13 3:07 AM
IP Address: X.X.X.X
Can anyone tell me specifically what this is referring too? Also how can this be corrected. In checking switch events I'm not seeing any indication of switch errors, reboots etc. I have approximately 25 switches I monitor and the lowest firmware version I'm running is 6.20.g. This switch indicated above is running at 6.20.g.
This message usually means that a switch has lost and recovered IP manageability, I'd recommend you to check the LAN.
Usually when I see this it's related to either duplex settings mismatch on either the DCFM Ethernet NIC or the switch Ethernet management ports. If you capture a supportshow you'll see reference to eth0 on the switch. The supportshow will display whether there is any dropped packets or collissions on these ports.