We have 2 c-class blade servers with 4 NIC. On the c-class enclosure, there are only two ethernet switch. Currently, NIC teaming is config on the blade server. It is running ESX 3.0. One of the VM will be put on DMZ. The easiest way is to buy two more ethernet switch and install them on the c-class blade enclosure. Then config another NIC teaming just for DMZ.
Another way is to enable VLAN on the VMs. Then enable VLAN tagging on the switch. On the blade server is easy. Just open switch management GUI, enable VLAN tagging on the NIC ports where the ESX servers connect to and make sure the crossVLAN ports are configure on the same VLAN as the NIC. For the external switch, (in our case, our blade enclosure connects to a Nortel switch) our Nortel 8300 can definitely handle it. Need to contact Nortel to find out though.
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