invalid(1) : This entry is not valid.
learned(2) : The value of the PORT and SLOT was learned,
and is being used.
static(3) : The address is in the dot1dStaticTable with
the instance of the MAC address.
restrict(4) : The address is in the restrictedTable with
the instance of the MAC address.
spantree(5) : The address is the spanning tree group address.
self(6) : The address is one of the bridge's addresses.
The port indicates which of the node's boards
has this address.