Show the current mac address table¶
The dynamic addresses have been learned from the network traffic,while the static ones are configured either by default or by theadministrator.
0100.0ccc.cccc is the Cisco Discovery Protocol (CDP) address.Other static/CPU addresses are special mac addresses that are used by the switch.
Statically configure a mac address¶
A MAC address for the switch can be seen in line 2 of the output of the command. A lot more information is actually output than what is shown. The show arp command will also show some MAC addresses, but only those with which the switch has had some communication at the IP level. The MAC addresses show Ethernet level communications. Define the pool using the mac-address pool command. Sets the MAC address for this interface in H.H.H format, where H is a 16-bit hexadecimal digit. For example, the MAC address 00-0C-F1-42-4C-DE would be entered as 000C.F142.4CDE. If you use failover, this MAC address is the active MAC address. It’s known that the IP address of his computer is 192.168.10.100. There are two possible ways of how you can determine the MAC address: To execute the ipconfig /all command in the command line on the user’s computer; Or. To learn the MAC address remotely if you know the user’s computer IP address. How you can identify MAC address and check MAC adress? Windows(XP,7,Vista,8): In the command prompt (CMD), type in getmac (or getmac /v /fo list for full info). Linux/Unix: type ifconfig -a. You must be root user or have appropriate permissions. Mac OS X: launch the Terminal and type ifconfig. Cisco: in the CLI type e.g.
Cisco Command Mac Address Table
This will statically configure the mac address a820… to be in (or from?) VLAN 1 on interface fa1/0/1.
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From the above you know the MAC Address of for the device: IP Address: 192.168.1.15 MAC Address: 0000.1111.1111. Now, do a show mac-address command on the core switch or router. This will show the interface to which it is connected or through which it is learned.
Cisco Mac Address Table
Cisco Router Mac Address Command
Configure mac aging¶
Cisco Show Mac Address
This will set the mac address aging to 5 minutes.If a mac address has not been seen during the last 5 minutes,it will be discarded from the table.