ZyXEL GS1500-24P User Guide - Page 122
MAC Forwarding Table, Static MAC Address Forwarding
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Chapter 16 MAC Address 16.2.1 MAC Forwarding Table The Switch uses the MAC Forwarding Table to determine how to forward frames. See the following figure. Figure 55 MAC Forwarding Table Flowchart 1 The Switch examines a received frame and learns the port on which this source MAC address came. 2 The Switch checks to see if the frame's destination MAC address matches a source MAC address already learned in the MAC table. • If the Switch has already learned the port for this MAC address, then it forwards the frame to that port. • If the Switch has not already learned the port for this MAC address, then the frame is flooded to all ports. Too much port flooding leads to network congestion. • If the Switch has already learned the port for this MAC address, but the destination port is the same as the port it came in on, then it filters the frame. 16.2.2 Static MAC Address Forwarding A static MAC address is an address that has been manually entered in the MAC address table. When you set up static MAC address rules, you are setting static MAC addresses for a port. This may reduce the need for broadcasting. 122 GS1500-24P User's Guide