Symptom

During times when the system system time is being changed to earlier time, when mac moves are also taking place, if mac move happens constantly, the system may hit the mac move limit and disable learning, even though mac moves are not happening frequently enough to trigger the threshold for learning disable and enable. 2024 Jul 2 11:55:28 C93180YC-EX %L2FM-4-L2FM_MAC_MOVE2: Mac aaaa.aaaa.aaaa in vlan 10 has moved from Eth1/2 to Eth1/3 2024 Jul 2 00:00:00 C93180YC-EX %L2FM-4-L2FM_MAC_MOVE2: Mac aaaa.aaaa.aaaa in vlan 10 has moved from Eth1/3 to Eth1/2 <<<<<<< 2024 Jul 2 00:00:01 C93180YC-EX %L2FM-4-L2FM_MAC_MOVE2: Mac aaaa.aaaa.aaaa in vlan 10 has moved from Eth1/2 to Eth1/3 2024 Jul 2 00:00:10 C93180YC-EX %L2FM-4-L2FM_MAC_MOVE2: Mac aaaa.aaaa.aaaa in vlan 10 has moved from Eth1/3 to Eth1/2 2024 Jul 2 00:00:11 C93180YC-EX %L2FM-4-L2FM_MAC_MOVE2: Mac aaaa.aaaa.aaaa in vlan 10 has moved from Eth1/2 to Eth1/3 2024 Jul 2 00:00:20 C93180YC-EX %L2FM-4-L2FM_MAC_MOVE2: Mac aaaa.aaaa.aaaa in vlan 10 has moved from Eth1/3 to Eth1/2 2024 Jul 2 00:00:21 C93180YC-EX %L2FM-4-L2FM_MAC_MOVE2: Mac aaaa.aaaa.aaaa in vlan 10 has moved from Eth1/2 to Eth1/3 2024 Jul 2 00:00:30 C93180YC-EX %L2FM-4-L2FM_MAC_MOVE2: Mac aaaa.aaaa.aaaa in vlan 10 has moved from Eth1/3 to Eth1/2 2024 Jul 2 00:00:31 C93180YC-EX %L2FM-2-L2FM_MAC_FLAP_DISABLE_LEARN: Disabling learning in vlan 10 for 120s due to too many mac moves <<<<<<< 2024 Jul 2 00:00:31 C93180YC-EX %L2FM-4-L2FM_MAC_MOVE2: Mac aaaa.aaaa.aaaa in vlan 10 has moved from Eth1/2 to Eth1/3

Conditions

-MAC moves happening on the switch. -System clock is being changed to an earlier time by NTP, PTP, or user input

Workaround

Correct the protocol time source and avoid changing the clock further for stability.

Further Problem Description