أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
Clear the MAC address table and force the switch to re-learn the MAC addresses correctly.
Switch#clear mac-address-table dynamic
Read following article its hel you...
http://www.cisco.com/c/en/us/support/docs/switches/catalyst-4500-series-switches/69081-Catalyst4500-switch.html