The MAC address used by the BRICK when it must be
referred to in a unique fashion. It is recommended that
this be the numerically smallest MAC address of all ports
belonging to the BRICK. However it is only required to
be unique. When concatenated with dot1dStpPriority a
unique BridgeIdentifier is formed which is used in the
Spanning Tree Protocol.
Indicates what type of bridging this BRICK can perform.
If the BRICK is actually performing a certain type
of bridging this will be indicated by entries in the port
table for the given type.