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- The switch uses the MAC address to identify which device’s outgoing packets are being sent, and where to deliver incoming packets. The MAC address identifies the physical device and doesn’t change, while the network layer (Layer 3) IP address, can be assigned dynamically to a device and change over time.
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In order to perform its function correctly, it must be able to learn the MAC addresses of the connected hosts and maintain them in a MAC address table. In this article, I’ll explain in detail how a switch achieves MAC Learning and why this is important for the operation of these devices.
Dec 22, 2023 · When a switch receives a data packet, it examines the destination MAC address to determine the appropriate port to which the packet should be forwarded. This process, facilitated by the switch’s MAC address table, enables targeted and efficient data transmission within the network.
- How Switches Learn Mac Addresses
- The Cam Table Is Not Shareable
- Viewing Entries of The Cam Table
- Relocation of Devices
When a switch receives a frame, it finds the frame's source address in the CAM table. If it finds an entry for the source address, it resets the timer stored in the aging field. If it does not find an entry, it adds a new entry for the source address. Let us take an example. The following image shows a network. This network has three PCs connected ...
A switch does not share its CAM table with others. If multiple switches are used in the network, each of them will use its own CAM table to take the forwarding decision. The following image shows a network that uses two switches.
To view the entries of the CAM table, you can use the "show mac-address-table" command in privileged-execmode. This command displays the CAM table's entries. If you use this command just after starting the switch, it displays a blank CAM table. A switch adds a device MAC address in the CAM table when it receives a frame from that device on any of i...
If you change a device's location, the switch receives frames from that device on another port. If a switch finds an entry for the source MAC address with different port information, it assumes that the device has been relocated. In this situation, the switch updates the port information along with the timer. This feature makes the relocation of de...
This lesson explains how a switch learns MAC address and why it floods frames when it doesn't know the destination MAC address.
MAC address table: The switch maintains a MAC address table that tracks the MAC addresses of devices connected to it. This table is used to determine the destination of incoming data packets, allowing for efficient routing.
A switch builds its MAC address table by recording the MAC address of each device connected to each of its ports. The switch uses the information in the MAC address table to send frames destined for a specific device out the port, which has been assigned to that device.
Dec 20, 2016 · How does a switch learn MAC Addresses. This article explains how a switch learns MAC address and why it floods frames when it doesn't know the destination MAC address.
