It is becoming more common that the switch has port security turned on.  This means only one MAC can plug into any single port.  It is not a big deal to reset it, but for some reason I could not find a direct answer.  Here is mine;

Reset sticky bit

Examples;

  • show port-security
  • clear port-security sticky int fa 0/1
  • clear port-security sticky int Gi1/0/15

References;

  • https://community.cisco.com/t5/switching/unable-to-clear-port-security-sticky/td-p/1090926
  • https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/25ew/configuration/guide/conf/port_sec.html

 


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