Cisco IOS introduction-Ethernet MAC address

This article mainly introduces the Ethernet MAC address of the CISCO router IOS, what is the MAC address, and the configuration introduction. I believe this article will help you.

Most of you may know what an Ethernet MAC address is, but you may not know how to apply a MAC address in a Cisco Internet Operating System.

An Ethernet MAC address uniquely identifies every Ethernet device in the world. Suppliers of production network devices, such as Ethernet network interface cards, wireless devices, routers and switches, pre-compile these addresses into their devices.

MAC addresses include other names, including physical addresses in Windows), Ethernet addresses, and hardware addresses. Whatever its name, it is a 12-character hexadecimal string. The following are some examples:

1234.5678.90ab

12-34-56-78-90-AB

12.34.56.78.90. AB

Determine your MAC address

In Windows, you can use the ipconfig/all command to find out your MAC address. List A is an instance.

In the output result of this command, you can find the MAC address in the physical address list. You can also use the show mac-address-table command to find similar information from the vswitch connected to this computer. The following is an example:

Switch # show mac-address-table

Mac Address Table

-------------------------------------------

VlanMac AddressTypePorts

----------------------------

All0014.1c40. b080STATICCPU

All01001_ccc. ccccSTATICCPU

All01001_ccc. cccdSTATICCPU

All01001_cdd. ddddSTATICCPU

1000f. 1fd3. d85aDYNAMICFa0/14

On a CISCO router, you can use the show interfaces command to find out which MAC address your interface uses. The following is an example:

RouterB # show interfaces

Ethernet0/0 is up, line protocol is up

Hardware is AmdP2, address is 0003. e39b. 9220 (bia 0003. e39b. 9220)

Internet address is 1.1.1.1/8

On the second line of each interface, you will see the hardware address with the burning address BIA. In the preceding example, the hardware address is 0003. e39b. 9220.

Each Ethernet interface on a CISCO router has its own Ethernet MAC address. Special devices such as routers and vswitches have many specific built-in addresses. For example, the four addresses shown in the output result of the show mac-address-table command above belong to this type; all the listed rows belong to the static type.