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#Dyn updater problem not working mac update#
#Dyn updater problem not working mac mac#

If the interface is connected to a hub, perform either of the following operations:.

#Dyn updater problem not working mac mac#

Run the port-security enable command on the interface to enable port security or run the mac-limit command to set the maximum number of MAC addresses that the interface can learn to 1.

When the attack stops, connect the computer to the network again.

If the interface is connected to a computer, perform either of the following operations after obtaining permission of the administrator:.

If the interface that you find is connected to another device, repeat this step until you find the user of the malicious user.

Locate the interface connected to the malicious user according to the displayed MAC address entries.

If the interface is connected to a device, run the display mac-address command on the device to view its MAC address table.

Check the device connected to the interface:

#Dyn updater problem not working mac update#

If the number of MAC addresses learned on an interface is much greater than the number of devices on the network connected to the interface, a user on the network may maliciously update the MAC address table.Run the display mac-address command to view all MAC address entries. If the number of learned MAC addresses has reached the maximum supported by the wireless access controller, no MAC address entry can be created.Run the display mac-address summary command to check the number of MAC addresses in the MAC address table. Check whether the number of learned MAC addresses has reached the maximum supported by the wireless access controller.Run the port-security max-mac-num command in the interface view to increase the maximum number of secure dynamic MAC addresses on the interface.Run the undo port-security enable command in the interface view to disable port security.Run either of the following commands:īy default, the limit on the number of secure dynamic MAC addresses is 1 after port security is enabled. If the command output contains port-security max-mac-num or port-security enable, the number of secure dynamic MAC addresses is limited on the interface. Run the display this command in the interface view.Run the mac-limit command in the interface view or VLAN view to increase the maximum number of learned MAC addresses.Run the undo mac-limit command in the interface view or VLAN view to disable MAC address limiting.If the command output contains mac-limit maximum, the number of learned MAC addresses is limited. Run the display this command in the interface view or VLAN view.MAC address limiting on the interface or VLAN If a blackhole MAC address entry is displayed, run the undo mac-address blackhole command to delete it. Run the display mac-address blackhole command to check whether any blackhole MAC address entry is configured. If a blackhole MAC address entry or MAC address limiting is configured, the interface discards packets. Check whether any blackhole MAC address entry or MAC address limiting is configured.

If MAC address learning is enabled on the interface, go to step 4.If MAC address learning is disabled, run the undo mac-address learning disable command in the interface view or VLAN view to enable MAC address learning.If the command output contains mac-address learning disable, MAC address learning is disabled on the interface or VLAN. Interface GigabitEthernet 0/0/1 mac-address learning disable Check that MAC address learning is disable.Ĭheck whether MAC address learning is disable in the interface view and the VLAN view.Check whether a loop on the network causes MAC address flapping.If not, re-configure the binding relationships between the MAC address, VLAN, and interface. Run the display mac-address command in any view to check whether the binding relationships between the MAC address, VLAN, and interface are correct. Check that the configurations on the interface are correct.