So yes, MAC address learning can be disabled even if port-security is used. Switch(config-if)#switchport block unicast If we implement blocking of unknown unicast traffic can't flow to R3. Traffic flows, traffic is flooded to R3 because no MAC address was learned there when port-security was not used. Success rate is 80 percent (4/5), round-trip min/avg/max = 1/2/4 ms Sending 5, 100-byte ICMP Echos to 10.0.0.1, timeout is 2 seconds: There is another device connected to Fa0/3. Switch#show port-security interface fa0/1 Max Addresses limit in System (excluding one mac per port) : 6144 Total Addresses in System (excluding one mac per port) : 0

Secure Port MaxSecureAddr CurrentAddr SecurityViolation Security Action Turn off the virtual machine, allocate a static MAC Address that does not belong to Hyper-V's dynamic MAC address range, then restart the virtual machine.What is the reason for disabling MAC learning? The last octet (ff) is automatically generated from the range 0x0-0xFF.īecause the last octet is an 8-bit value, there is a default limit of 256 possible MAC addresses.The next two octets (dd-ee) are derived from the last two octets of the server's IP address.The first three octets (aa-bb-cc) are Microsoft's IEEE organizationally Unique Identifier, 00:15:5D (which is common on all Hyper-V hosts.Hyper-V generates the MAC address as described below (mapping MAC address to aa-bb-cc-dd-ee-ff): This problem occurs because the default number of dynamic MAC addresses for virtual machines (256) has been exceeded. On a Windows Server 2008 or Windows Server 2008 R2 Hyper-V host, an Event ID 12565 from source 'Microsoft-Windows-Hyper-V-Worker' is logged, as described in the Event ID 12565 - NIC Configuration.

Synthetic Ethernet Port (Instance ID CCE417C5-BDD9-4216-85CA-248620EE75C6): Failed to power on with Error 'Attempt to access invalid address'. The application encountered an error while attempting to change the state of '' When you start a guest virtual machine, you may encounter the following error message: The Hyper-V server is configured to provide Dynamic MAC addresses to the guest machines. You have a Windows Server 2012 computer that is configured with the Hyper-V role. This article provides a solution to an issue that occurs when you start a guest virtual machine.Īpplies to: Windows Server 2012 R2 Original KB number: 2804678 Symptoms

Disable dynamic mac address learning