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This command deletes entries from the global MAC address table. Ĭlear all the addresses for an interface. Use the clear mac-address-table EXEC command to delete entries from the MAC address table. Specify the interval between Hello Bridge Protocol Data Units (BPDUs).Ĭhange the interval the switch waits to hear BPDUs from the root bridge.Ĭonfigure the priority of an individual bridge or the likelihood that it will be selected as the root bridge.Ĭonfigure the Spanning-Tree Protocol priority of a port.ĭefine the type of Spanning-Tree Protocol. Specify the forward delay interval for the switch. Place this interface into a port aggregation groupīroadcast traffic is disabled if too many broadcast packets are seen on this port.ĭisable Spanning-Tree Protocol for the switch. Prevent the flooding of unknown destination MAC addresses and multicast address on this interface. Specify the duplex mode of operation for an interface. Set a primary or secondary IP address of an interface. Set the length of time that a dynamic entry can remain in the address table.Įnable address learning on the current interface.Īdd entries to the address table that are known to be secure addresses.
CISCO MAC ADDRESS TABLE MAXED OUT SERIES
Table 2-1 Commands Created or Changed for the Catalyst 2900 Series XL Commandsĭelete all addresses currently in the MAC address table.ĭisplay the blocking of unicast and multicast filtering for the port.ĭisplay the ports that have been assigned to groups.ĭisplay the ports that have had port monitoring enabled for them.ĭisplay the ports that have had port security enabled.ĭisplay the disposition of broadcast-storm control. So even though it may seem overwhelming at first, keep at it as no one said getting your Cisco certification would be easy! As you progress through your CCNA exam studies, I am sure with repetition you will find these commands becoem second nature. So to assist you, below we provided you a list of Cisco Switch Commands you may see on your CCNA exam.
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Switch(config-)# no mac-address-table static mac_address vlan vlan-idĭeletes the static entry from the MAC address table.In preparation of your CCNA exam, we want to make sure we cover the various concepts that we could see on your Cisco CCNA exam.
CISCO MAC ADDRESS TABLE MAXED OUT UPDATE
If you enable the auto-learn option, the switch will update the entry if the same MAC address is seen on a different port. Specifies a static address to add to the MAC address table. switch(config-)# mac-address-table static mac_address vlan vlan-id You can also configure a static MAC address in interface configuration mode or VLAN configuration mode.Ģ. These addresses are static MAC addresses. You can configure MAC addresses for the switch. The switch uses an aging mechanism, defined by a configurable aging timer, so if an address remains inactive for a specified number of seconds, it is removed from the address table. The address table can store a number of unicast and multicast address entries without flooding any frames. A multicast address can accept more than one interface as its destination. In addition, you can enter a multicast address as a statically configured MAC address. These static MAC entries are retained across a reboot of the switch. You can also enter a MAC address, which is termed a static MAC address, into the table. The switch then forwards subsequent frames to a single LAN port without flooding all LAN ports. When the destination station replies, the switch adds its relevant MAC source address and port ID to the address table. When the switch receives a frame for a MAC destination address not listed in its address table, it floods the frame to all LAN ports of the same VLAN except the port that received the frame. The switch dynamically builds the address table by using the MAC source address of the frames received. When the switch receives a frame, it associates the media access control (MAcC) address of the sending network device with the LAN port on which it was received. To switch frames between LAN ports, the switch maintains an address table.