Switches also use MAC addresses to make accurate forwarding and filtering decision. When the switch receives a frame, it associates the media access control (MAC) address of the sending device with the interface on which it was received. The table that stores such associations is know as the MAC address table. This table is stored in the. The switch will build a MAC address table and only learns from source MAC addresses. At this moment it just learned that the MAC address of computer A is on interface 1. It will now add this information in its MAC address table. But the switch currently has no information where computer B is located. The configurations from all the switch-to-switch ports on all the switches would be helpful, as would the output from show mac-address-table on all the switches. – Ron Maupin Jul 20 '16 at 15:33 1.
I recently started reevaluating how we do port security as a result of a recent customer's information security audit. We normally turn on port security and set the maximum MAC addresses to 1 (the default) or 2 (if there is an IP phone connected). The default behavior is to disable the port when the MAC changes or if the number of concurrent MAC’s exceeds the maximum.
However during testing I discovered this didn’t work exactly like I expected. Port security was enforced as long as a device stayed connected to the port. If the port was disconnected, the switch would remove the pre-existing MAC’s and ANY new device could connect, as long as the maximum was not exceeded. While this prevents unauthorized hubs and switches, it doesn’t prevent someone from unplugging a device and plugging in a different unauthorized device.
The solution to this is to use the sticky option on the port security interface command: [more]
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![Best mac for engineering](/uploads/1/1/9/8/119871808/395229642.jpg)
- switchport port-security – enables port security, optional “maximum <n>” to set the max greater than 1
- switchport port-security mac-address sticky – turns on the sticky MAC feature
After enabling, you will notice the currently connected MAC address(es) will appear in the running config:
- switchport port-security
- switchport port-security mac-address sticky 0080.6433.xxxx
This will stay in the config until the switch is rebooted, so it’s important to write the config.
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Other related commands:
- show port-security address – lists all the learned MAC addresses by interface
- show port-security interface fa0/1 – shows the detailed port security settings for an interface, including enable/disable status
- clear port-security sticky interface fa0/1 – clears the learned sticky MAC addresses, must be done prior to a shut/no shut to re-enable a port disabled due to port security
When you use sticky MAC addresses you'll want to make sure that the MAC addresses are cleared off of a switch when a device is moved. We had a laptop that was moved from one client location to another and one of the distribution switches was thinking the device was plugged into the old switch and the other distribution switch thought it was plugged ito the new switch. This created a situation where some network traffic was reaching the laptop and some was going into a black hole. After clearing the the sticky MAC addresses on the old switch the problem was resolved.
Update: You might also be interested in a couple stick MAC address tips.
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Ethernet Switch Mac Address
![Mac Address For Switch Ports Mac Address For Switch Ports](/uploads/1/1/9/8/119871808/277392660.png)
A switch has some intelligence and operates on layer 2 of the OSI model. In this lesson, I’ll demonstrate how a switch learns MAC addresses. Let me show you an example of three computers connected to a switch:
There’s a switch in the middle and we have 3 computers. All computers have a MAC address but I’ve simplified them. Our switch has a MAC address table and it will learn where all the MAC addresses are in the network. Let’s send something from H1 to H2:
![Mac Address For Switch Ports Mac Address For Switch Ports](/uploads/1/1/9/8/119871808/333713601.jpg)
A switch has some intelligence and operates on layer 2 of the OSI model. In this lesson, I'll demonstrate how a switch learns MAC addresses. Let me show you an example of three computers connected to a switch: There’s a switch in the middle and we have 3 computers. All computers have a MAC address b
Cisco Show Mac Address Port
H1 is going to send some data meant for H2, thus it will create an Ethernet frame which has a source MAC address (AAA) and a destination MAC address (BBB). Our switch has a MAC address table and here’s what will happen: