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Have you had success with this yet? We're trying a similar interconnect config but no long term success. We have five Dell R710 nodes and we're using the four onboard Broadcom NetXtreme II (bnx2) NICs in an 802.3ad bond with src-dst-mac load balancing and stacked Cisco 3750E-24TD-SD switches. After a random period of time (in the range of a few days to a week) all four NICs in one or more of the servers will go offline and eventually the server will reboot due to loss of the interconnect. We're about to the point of giving up on the idea of an 802.3ad bond and instead use two connections in an active/standby bond. We've updated the kernel to have the latest broadcom drivers (1.9.3) and turned off TOE on the NICs but the problem persists. Now we're updating the firmware on the NICs to the latest version (5.0.6 NCSI 2.0.3) to see if that helps. If you have your interconnects working with 802.3ad bonding I'd like to hear if you were successful just so we know it is possible and somebody did it. Thanks.