Thanks to this table we enjoy things like ARP suppression on our NSX-T Data Plane. The Central Control Plane also maintains a global ARP table. To translate a Transport Node ID to an ESXi Management IP address we would run: get transport-node status ARP Table This tells us on which transport node the MAC address is connected and basically discloses on which host the virtual machine is running. The MAC addresses are reachable via two different TEP IP addresses which are shown in the “VTEP-IP” column.Įach entry also contains a value for the Transport Node ID. We can now run the following command to see the learned MAC address entries for the “App” segment: get logical-switch 65538 mac-table In this case we’re interested in the “App” segment which has VNI 65538. From the Manager CLI we run the following command to list segments and their VNIs: get logical-switches To see the learned MAC addresses and their associated TEPs for a segment we first need to know that segment’s Virtual Network Identifier (VNI). We query the MAC address table on a per NSX-T segment basis.
Another option would be to leverage the NSX-T API using curl for example. In this article I will show you how it’s done using the Manager CLI. There’s more than one way to retrieve entries from the CCP’s MAC address table. So, that’s a pretty cool table, right? One that you might want to have a look at yourself now and then perhaps. This is by design and protects the CCP from injection of an arbitrarily large number of MAC addresses into in the network.
The second exception is when MAC addresses are learned from an Edge bridge connected to a physical layer 2 network. The first exception is when a vNIC is allowed to send traffic from several source MAC addresses. There are two exceptions where MAC addresses of connected vNICs are not registered with the CCP. The CCP’s MAC address table is also used to pre-populate the local MAC address tables on Transport Nodes before they receive any traffic. Now, when the Data Plane receives a frame destined to an unknown MAC address, besides flooding the frame, it will also query the CCP’s MAC address table to see if it can find a matching entry there. MAC Address TableĪs soon as a virtual machine’s vNIC is connected to the NSX-T Data Plane, its MAC address as well as the Tunnel End Point (TEP) used to reach that MAC address are registered with the CCP. In today’s article I’ll have a closer look at these two tables. If you import a virtual machine with a host-generated MAC address from one vCenter Server to another, select the I Copied It option when you power on the virtual machine to regenerate the address and avoid potential conflicts in the target vCenter Server or between the vCenter Server systems.The NSX-T Central Control Plane (CCP) is building and maintaining a central repository for some tables that make NSX-T the unique network virtualization solution it is. Preventing MAC Address ConflictsĪll MAC addresses that have been assigned to network adapters of running and suspended virtual machines on a given physical machine are tracked for conflicts. The virtual machine UUID is based on a hash calculated by using the UUID of the ESXi physical machine and the path to the configuration file (. The host generates MAC addresses that consists of the VMware OUI 00:0C:29 and the last three octets in hexadecimal format of the virtual machine UUID.
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