Redhat bonding with two switch

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http://serverfault.com – I have a server with two NICs, each connect to separate switch. Two switches connected with a trunk link. The problem is the bonding link is not stable (lost some packets). When I unplug cable from 1 link, many packets has been lost (nearly 1 packet lost on 2 packets). I've tried with all of Redhat bonding list but cannot solve my problem. My question is: Can I do it and how or why? Thanks in advance giobuon (HowTos)