Hello. I have a problem with my network and i would like to ask for some info. I have 4 cisco catalyst switches 2960G each of them serves a rack of servers. They all end up (with trunk ports) to two 4507 R-E switches configured for GLBP .All vlans and network ping and access each other through this GLBP and work fine. However some times connectivity is lost. For example i have a 10.10.10.210/24 server trying to backup to a 10.20.10.50/24 server. The connection from time to time gets lost. If i repair the network connection in Windows it gets back up. However if i continuously ping the backup server it never drops but i cannot keep pinging forever. Any help would be appreciated. Thanks a lot in advance.
Because of your mention of "However if i continuously ping the backup server it never drops . . .", and your description of dual L3 swithes, I'm wondering if you're bumping into a unicast flooding issue. You might review http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a00801d0808.shtml.