We deployed our first MLAG scenario with 2 x670's at the core and with VMware 6.0 downstream. We had unusual amounts of what appeared to be packet loss, overall slowness and VM's showing online, then offline, etc. A packet trace revealed a TON of duplicate packets and retransmissions. When we took the second peer offline, these ceased. We've since confirmed that both sides of each MLAG are using L3 algorithm (IP HASH on vswitch), we removed all unused / standby adapters from the vswitch and we ensured that beacon probing was off. We otherwise followed the 2012 white paper from Extreme on deploying MLAG in an ESXi environment. Not sure if all of the duplicate traffic is expected in this config or if we're doing something wrong. Ideas?