Multicast Entries on MAC address table

[inɒmoЯ]

Hello, 

 Why do I see ffff.ffff.ffff and what are the "Multicast Entries" for in a show mac address? do the type "system" means its been assigned by the switch itself? where can I read about this please. TIA

[balaji.bandi]

check this thread to get more information and discussed already :

https://community.cisco.com/t5/switching/why-some-switch-ports-does-not-show-mac-address/td-p/1934721

[inɒmoЯ]

@balaji.bandi Thank you for your reply, however, that does not answer the question I asked. what are the "Multicast Entries" for in a show mac address?