#SWITCH MAC ADDRESS LEARNING HOW TO#
#SWITCH MAC ADDRESS LEARNING SERIES#
#SWITCH MAC ADDRESS LEARNING MAC#

#SWITCH MAC ADDRESS LEARNING MAC#

To keep the entries in the MAC address table up to date, switch uses an aging mechanism. Then, the switch records that information in the MAC address table.

#SWITCH MAC ADDRESS LEARNING SERIES#

Show ethernet-switching mac-learning-log (QFX Series Switches, QFabric, NFX Series Devices and EX4600) show ethernet-switching mac-learning-log That way, the switch examines the frames by learning their source MAC addresses and identifying the ports in which the frames have entered the switch. Show ethernet-switching mac-learning-log (EX Series switch) show ethernet-switching mac-learning-log Output fields are listed in the approximate order in which The show ethernet-switching mac-learning-log command on SRX Seriesĭevices. The log displays the name of the interfaceįrom where the MAC address moved, and the name of the interface toĭisplays the MAC address flags in which the MAC event When a MAC address is moved, there is another field with

The name of the interface on which the MAC address is Or moved from one interface to another interface. MAC address that are added, learned, deleted, changed The name of the VLAN on which the MAC is learned. A value defined by the user for all user-configured A WAP must translate the Wi-Fi frames into ethernet frames, and vice versa, but it preserves the original host source and destination MAC addresses of the original frames on the translated frames.Ethernet-switching mac-learning-log Output Fields Bridges normally forward frames transparently. The bridges will not normally have MAC address table entries for other bridges because the bridges do not originate traffic, so the frames will not have the source MAC address associated with the bridge. The switch interface for the WAP could have multiple MAC addresses associated with it in the switch MAC address table if multiple hosts on the WAP send frames into the switch, but the key is that the switch must see at least one frame for a host enter the switch during its timeout period for you to see the MAC address in its MAC address table. It is only when a host on the WAP sends a frame that enters the switch that the switch will create an entry for the MAC address of the host.

If a host on your WAP sends frames to another host on the WAP, the switch will not see those frames, so it will not have an entry in its MAC address table for those hosts. In your comment, you explain that you have another bridge (switches and WAPs are bridges). On a Cisco switch, the show mac-address-table command will show all the entries for all the MAC address tables, but other vendors may do it differently.Īlso, MAC address table entries will time out, so if the switch has not seen any frames from a particular host in a while, the MAC address table entry for that host will time out of the table.

#SWITCH MAC ADDRESS LEARNING HOW TO#

You did not specify the switch model, so we cannot tell you specifically how to see the MAC address table. A switch has a MAC address table for each VLAN, and the switch will populate the MAC address table of the VLAN with the source MAC address of any frame entering the switch on an interface in that VLAN.

Switch mac address learning