Configuring MAC Table Aging (CLI Procedure)
The aging process ensures that the EX Series switch tracks only active nodes on the network and that it is able to flush out network nodes that are no longer available.
To manage MAC entries more efficiently, you can configure an entry's aging time, which is the maximum time that an entry can remain in the Ethernet Switching table before it “ages out”.
To configure how long entries remain in the Ethernet Switching table before expiring, using the CLI (here, the VLAN is employee-vlan):
[edit vlans employee-vlan]
user@switch# set mac-table-aging-time 200