Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1738

Complete Software Guide for Junos
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OS for EX Series Ethernet Switches, Release 10.4
Set the MAC aging timer to the same value as the ARP timer. (By default, the MAC
2.
aging timer is set to 300 seconds. The range is 15 to 1,000,000 seconds.)
[edit vlans]
user@switch# set vlans sales mac-table-aging-time 180
The ARP entry and the MAC address entry for the moved device expire within the times
specified by the aging timer values. After the entries expire, the switch sends a new ARP
message to the IP address of the device. The device responds to the ARP, thereby
refreshing the entries in the switch's ARP cache table and Ethernet switching table
arp on page 210
mac-table-aging-time on page 1679
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