Because of this, each team member uses a different MAC address. To prevent the switches from getting confused and to prevent MAC flapping alarms, the source MAC address is replaced with a different MAC address on the frames transmitted on team members other than the primary team member. When you configure a NIC Team in switch independent mode and either address hash or dynamic load distribution, the packets from a single source (such as a single VM) are simultaneously distributed across multiple team members. You can set the MAC address of the NIC team to a specific MAC address by setting it in the primary team interface, just as you can do when configuring the MAC address of any physical NIC. The process of disabling and enabling the team interface causes the interface to select a new MAC address from the remaining team members, and eliminates the MAC address conflict. To resolve this conflict, disable and then enable the team interface. If the primary team member is removed from the team and then placed into operation, there may be a MAC address conflict. In most situations this doesn't cause problems, but there are a few cases where issues might arise. Because the primary team member might change in a non-deterministic manner at each boot, NIC disable/enable action, or other reconfiguration activities, the primary team member might change, and the MAC address of the team might vary. It is the first team member to bind to the team after you create it or after the host computer is restarted. The primary NIC Team member is a network adapter that the operating system selects from the initial set of team members.
When you configure a NIC Team with switch independent mode and either address hash or dynamic load distribution, the team uses the media access control (MAC) address of the primary NIC Team member on outbound traffic.
#NFPS SERVER MAC ADDRESS CHECKER WINDOWS#
Applies to: Windows Server 2022, Windows Server 2019, Windows Server 2016, Azure Stack HCI, versions 21H2 and 20H2
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