https://community.extremenetworks.com/t5/extremeswitching-ers/mac-address-table-full-root-cause/m-p/122806#M661 <P>Hi all<BR />Three years later, the problem has resurfaced. It appears that certain devices are causing "flapping," preventing the MAC table from clearing normally.&nbsp;<BR />I tried locking the negotiation to 100 Full and forcing the PoE mode, but nothing works - the flapping persists and mac-address-table keep growing. I change aging-time to 100 and 30, growing slowly, but steel growing.<BR />Have you ever encountered this problem? What can be done, and why does "flapping" interfere with normal operation ?<BR /><BR />ERS 3650,<BR />Commend PoE HP make flapping<BR /><BR />Thanks<BR /><BR /></P> Tue, 13 Oct 2026 13:58:16 GMT darvid 2026-10-13T13:58:16Z https://community.extremenetworks.com/t5/extremeswitching-ers/mac-address-table-full-root-cause/m-p/122806#M661 <P>Hi all<BR />Three years later, the problem has resurfaced. It appears that certain devices are causing "flapping," preventing the MAC table from clearing normally.&nbsp;<BR />I tried locking the negotiation to 100 Full and forcing the PoE mode, but nothing works - the flapping persists and mac-address-table keep growing. I change aging-time to 100 and 30, growing slowly, but steel growing.<BR />Have you ever encountered this problem? What can be done, and why does "flapping" interfere with normal operation ?<BR /><BR />ERS 3650,<BR />Commend PoE HP make flapping<BR /><BR />Thanks<BR /><BR /></P> Tue, 13 Oct 2026 13:58:16 GMT https://community.extremenetworks.com/t5/extremeswitching-ers/mac-address-table-full-root-cause/m-p/122806#M661 darvid 2026-10-13T13:58:16Z