Mac address table cisco router


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We will use the graphic in Figure 1. Figure 1 Basic switched network. In Figure 1 , a switch is surrounded by a number of common devices.

Let's assume that all of the devices are powered on but have not sent any traffic. In this case, the MAC address table of the switch would be empty ignoring any system MAC addresses shown in the table by default. It would encapsulate an Ethernet frame and send it off toward the switch.


  • Cisco Catalyst 6500 Series Switches - Loss of Dynamic MAC Addresses with Distributed Switching.
  • Verify the Address Resolution Protocol table.
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The switch would then perform a lookup on its MAC address table to determine whether it knows which port to send the traffic to; since no matching entries exist in the switch's tables, it would flood the frame out all of its interfaces except the receiving port. Because the frame was sent out to all of the switch's other ports, it would be received by the target server.

Assuming that the server wants to respond to PC1, it would sent a new frame back toward the switch. Optional Specifies the interface.

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The interface can be either Ethernet or EtherChannel. Optional Specifies the Ethernet interface slot number and port number. The slot number is from 1 to , and the port number is from 1 to Optional Specifies the EtherChannel interface. The EtherChannel number is from 1 to Optional Displays information about the multicast MAC address table entries only.

Optional Displays information about the static MAC address table entries only.

Examining ARP and Routing Tables
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