We have an isolated LAN (02x switches 3750 with IP Base 12.2.25(SEE1)where soem of our servers are connected with a second lan interface that is used only for data backup. The switches configuration is default with only IP address at Int Vlan 1 for management.
And the problem is that three times (01 Unix and 02 Windows Servers) the servers stopped working and only solutions was rebooting them. Is ther some possible reason?
If so, don't add a default gateway to the interface for backup.
You may need to add a host or subnet route to the server to get to your backup server if it's not on the same subnet as the interface for backup.
You should probably also check whether the software you are running is compatible with such a configuration... some things aren't, or may require that you check your NIC bindings are in the correct order (i.e. 'live' NIC appears first).
Perhaps you should consider bonding the two interfaces into an active/passive fault tolerant setup (or an EtherChannel if you believe you need the bandwidth). If your backups are running at non-peak times, perhaps you don't need this type of setup at all?
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The servers have two NICs ans the second doesn't have default gateway. What is strange is that switch looses the NIC MAC Address from table. At the first time we rebooted the server and resolved but now it lost the communication again.
The server that has lost communication again is a W2003 and uses the mais NIC for corporate LAN with many client-server applications and the second NIC (that is connected to 3750 of data backup network). The problem happens at data backup network switch and like I mencioned before, it stops answering and not eve the MAC address is detected by switch.
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The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.