The default MAC age-out timer on an EX Series switch is 300 seconds 1 2 . The MAC age-out timer is the maximum time that an entry can remain in the MAC table before it "ages out," or is removed 3 1 . This configuration can influence efficiency of network resource use by affecting the amount of traffic that is flooded to all interfaces 1 . When traffic is received for MAC addresses no longer in the Ethernet routing table, the router floods the traffic to all interfaces 1 .