Checking MAC Addresses on a Cisco Switch

1. Finding Mac Address For Cisco Access Control Module

You can check the MACaddresses stored by a Cisco switch by logging into the switch and issuingthe command show mac address-table. The addresses arestored in a table called the bridge forwarding table or CAM table.

Checking MAC Addresses on a Cisco Switch You can check the MAC addresses stored by a Cisco switch by logging into the switch and issuing the command show mac address-table. The addresses are stored in a table called the bridge forwarding table or CAM table. MAC address is used by Media Access Control (MAC) sublayer of Data-Link Layer. MAC Address is word wide unique, since millions of network devices exists and we need to uniquely identify each. Format of MAC Address – MAC Address is a 12-digit hexadecimal number (6-Byte binary number), which is mostly represented by Colon-Hexadecimal notation. Use ODBC connection to check against MAC address Database - (‎ 08:16 AM) Network Access Control by umahar on ‎ 08:16 AM Latest post on ‎ 07:01 PM by hslai.

Switches maintain a table of both static and dynamically learnedIP addresses. Cisco switches have a number of special built-inaddresses such as the 4 static address above. E.g., in the above case the first entry 0009.e897.d280 is a static entry reflecting the MAC address of the switch itself. In the above example, 3 systems are connected to the switch on ports 1, 12, and 18. Their addresses are reported as dynamicaddresses.

You can view just the static or just the dynamic MAC addresses with thecommands show mac address static and show mac addressdynamic.

You can also view the MAC addresses using the show interfacescommand Best wireless printer for mac os xcookingbrown. , but that gives you a lot of extra information as well,so it isn't as easy to see the MAC addresses for all interfaces at a glance.

A MAC address for the switch can be seen in line 2 of the output ofthe command. A lot more information is actually output than what isshown.

The show arp command will also show some MAC addresses, butonly those with which the switch has had some communication at the IP level. The MAC addresses show Ethernet level communications.

In the example above, the 192.168.0.50 address representsthe IP address of the system by which I was logged into the switch. Theswitch IP address was 192.168.0.4.

References:

1. Cisco administration 101: Understanding Ethernet MAC addresses
   By: David Davis CCIE, MCSE+I, SCSA
   Date: october 12, 2006
   TechRepublic
2. How a Cisco Switch functions on an Ethernet network
   By: David Davis, vExpert, VCP, CCIE 9369
   Date: January 7, 2009
   Petri IT Knowledgebase

Ethernet uses MAC (Media Access Control)addresses to uniquely identify a host in an Ethernet environment. Every Ethernet network interface card (NIC) has a MAC address burned in its firmware, which is why MAC addresses are sometimes known as hardware addresses.

MAC addresses are 6 Bytes (48 bits) long. Every network card manufacturer gets a universally unique 3-byte code called the Organizationally Unique Identifier (OUI). Manufacturers agree to give all NICs a MAC address that begins with the assigned OUI. The manufacturer then assigns a unique value for the last 3 bytes, which ensures that every MAC address is globaly unique.

In the following picture we can see the structure of a MAC address: Mac 3227 weed eater manual.

MAC addresses are usually written in the form of 12 hexadecimal digits. For example, this is a valid MAC address: D8-D3-85-EA-1B-EE. Each hexadecimal character is 4 bits long, so the first six hexadecimal characters represent the vendor (in this case, Hewlett Packard).

How to find the MAC address of your computer

You can find out the MAC address your computer is using. The process depends on your operating system:

Windows

Go to the Command Prompt (Start – Programs – Accessories – Command Prompt on Windows XP, for newer versions of Windows, just type cmd from the Start screen). Once inside the Command Prompt, type the ipconfig/all command. The MAC address is shown in the Physical Address field:

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Linux

Go to the shell and type the ifconfig command. The MAC address should be listed as HWaddr:

Finding Mac Address For Cisco Access Control Module