For example, your service provider might perform access control based on the MAC address. You might want to assign unique MAC addresses to subinterfaces. Subinterfaces - All subinterfaces of a physical interface use the same burned-in MAC address. Physical interfaces - The physical interface uses the burned-in MAC address. Default MAC Addressesĭefault MAC address assignments depend on the type of interface. If the active unit fails over and the standby unit becomes active, the new active unit starts using the active MAC addresses to minimize network disruption.Īctive and standby MAC addresses are configured on the Advanced tab when configuring an interface.
The MAC address will be mapped to respective VLAN and the switchport in the MAC address table. The source MAC address of the frame will be added to the MAC table. You can manually configure Media Access Control (MAC) addresses to override the default value.įor a high availability configuration, you can configure both the active and standby MAC address for an interface. The switch will auto-learn the MAC address associated with a port when it receives layer 2 frames from the machines on a particular switchport.
#TROUBLESHOOT CISCO MAC ADDRESS TABLE LICENSE#
Managing AWS with Cisco Defense Orchestrator.Managing IOS Devices with Cisco Defense Orchestrator.Managing Meraki with Cisco Defense Orchestrator.Managing Umbrella with Cisco Defense Orchestrator.About Managing Cisco Secure Firewall Cloud Native with Cisco Defense Orchestrator.Managing ASA with Cisco Defense Orchestrator.Synchronizing Interfaces Added to a Firepower Device using FXOS.Viewing and Monitoring Firepower Interfaces.IPv6 Addressing for Firepower Interfaces.Use of MTU Settings in Firepower Interface Settings.Use of MAC Addresses in Firepower Interface Settings.Use of Auto-MDI/MDX in Firepower Interface Settings.Assign an FTD Interface to a Security Zone.Use of Security Zones in Firepower Interface Settings.Guidelines and Limitations for Firepower Interface Configuration.Managing FTD with Cisco Defense Orchestrator.Managing FMC with Cisco Defense Orchestrator.
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