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Verifying That Persistent MAC Learning Is Working Correctly
Purpose
Verify that persistent MAC learning, also known as sticky MAC, is working on the interface. Persistent MAC learning allows retention of dynamically learned MAC addresses on an interface across restarts of the switch (or if the interface goes down).
Action
Display the MAC addresses that have been learned. The following sample output shows the results when persistent MAC learning is enabled on interface ge-0/0/42:
show ethernet-switching table persistent-mac
user@switch> show ethernet-switching table Ethernet-switching table: 8 entries, 2 learned, 5 persistent entries VLAN MAC address Type Age Interfaces default * Flood - All-members default 00:10:94:00:00:02 Persistent 0 ge-0/0/42.0 default 00:10:94:00:00:03 Persistent 0 ge-0/0/42.0 default 00:10:94:00:00:04 Persistent 0 ge-0/0/42.0 default 00:10:94:00:00:05 Persistent 0 ge-0/0/42.0 default 00:10:94:00:00:06 Persistent 0 ge-0/0/42.0 default 00:21:59:c8:0c:50 Learn 0 ae0.0 default 02:21:59:c8:0c:44 Learn 0 ae0.0
Meaning
The sample output shows that learned MAC addresses are stored in the Ethernet switching table as persistent entries. If the switch is rebooted or the interface goes down and comes back up, these addresses will be restored to the table.
