Operation Manual – MAC Address Table ManagementH3C S5600 Series Ethernet SwitchesChapter 1 MAC Address TableManagement1-8for these MAC addresses through the hardware, improving the forwarding efficiency. AMAC address table too big in size may prolong the time for searching MAC addressentries, thus decreasing the forwarding performance of the switch.By setting the maximum number of MAC addresses that can be learnt from individualports, the administrator can control the number of the MAC address entries the MACaddress table can dynamically maintain. When the number of the MAC address entrieslearnt from a port reaches the set value, the port stops learning MAC addresses.Follow these steps to set the maximum number of MAC addresses a port can learn:To do… Use the command… RemarksEnter system view system-view —Enter Ethernet port view interface interface-typeinterface-number —Set the maximum numberof MAC addresses theport can learnmac-addressmax-mac-count countRequiredBy default, the number ofthe MAC addresses a portcan learn is not limited.Note:If you have configured the maximum number of MAC addresses that a port can learn,you cannot enable the MAC address authentication or port security functions on theport, and vice versa.1.2.5 Enabling Destination MAC Address Triggered UpdateBy default, a switch updates its MAC address entries based on the source MACaddresses of packets. However, this may cause the switch to perform unnecessarybroadcasts in some applications. For example, when a port aggregation group is usedin an IRF fabric for communications, MAC address entries of some ports in theaggregation group may not be updated in time, resulting in unnecessary broadcasts.The destination MAC address triggered update function solves the above problem byallowing the switch to update its MAC address entries according to destination MACaddresses in addition to source MAC addresses. This function improves the availabilityof the MAC address table.
