![show mac address table explained show mac address table explained](https://www.researchgate.net/profile/Farhan-Ramadhan/publication/332652159/figure/fig4/AS:751577711255553@1556201498514/show-mac-address-table.jpg)
Now let's break this down a little bit to understand how the MAC address table is built and used by an Ethernet switch to help traffic move along the path to its destination. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company. The table shows the MAC Address Table which has not yet learned the MAC addresses for the four attached PCs. A MAC address table, sometimes called a Content Addressable Memory (CAM) table, is used on Ethernet switches to determine where to forward traffic on a LAN.
#Show mac address table explained for mac
In the figure, the four-port switch was just powered on. Port Address Table Listing MAC addresses for a specific port Use the Space bar to select the port you want to list or search for MAC addresses, then press Enter to list the MAC addresses detected on that port. Without the MAC address table, traffic would be forwarded out each port, like a hub (hopefully you haven’t used one of those in a long time.) Host A has a fictitious MAC address of AA:AA:AA:AA:AA:AA and it wants to. This makes it efficient to forward traffic directly to a host.
![show mac address table explained show mac address table explained](https://i.ytimg.com/vi/lmBKWkW-KcQ/maxresdefault.jpg)
It is an edge port and in a forwarding state. The MAC address table is a way to map each port to a MAC address. What does the type BLOCKED mean The port is not blocked neither from a security point of view ( no port security defined) and not from a spanning tree point of view. The switch makes its forwarding decisions based solely on the Layer 2 Ethernet MAC addresses.Īn Ethernet switch examines its MAC address table to make a forwarding decision for each frame, unlike legacy Ethernet hubs that repeat bits out all ports except the incoming port. Total Mac Addresses for this criterion: 3 1. It is completely unaware of the data (protocol) being carried in the data portion of the frame, such as an IPv4 packet, an ARP message, or an IPv6 ND packet. If a switch just forwarded every frame it received out all ports, your network would be so congested that it would probably come to a complete halt.Ī Layer 2 Ethernet switch uses Layer 2 MAC addresses to make forwarding decisions. So if host A and host B decide to communicate inside the next 5 minutes, a new ARP process will not be necessary. Now that you know all about Ethernet MAC addresses, it is time to talk about how a switch uses these addresses to forward (or discard) frames to other devices on a network. By default, MAC addresses stay in the switch’s MAC address table for 5 minutes. Lab – View the Switch MAC Address Table.Video – Sending the Frame to the Default Gateway.Enter configuration commands, one per line. For my second question, I have done the following: SW6conf t. You shouldnt add the 'dynamic' keyword to see the dynamic entries.
#Show mac address table explained apk