entPhysicalSerialNum

The vendor-specific serial number string for the physical
entity.  The preferred value is the serial number string
actually printed on the component itself (if present).
              
On the first instantiation of a physical entity, the value
of entPhysicalSerialNum associated with that entity is set
to the correct vendor-assigned serial number, if this
information is available to the agent.  If a serial number
is unknown or non-existent, the entPhysicalSerialNum will be
set to a zero-length string instead.
              
Note that implementations that can correctly identify the
serial numbers of all installed physical entities do not
need to provide write access to the entPhysicalSerialNum
object.  Agents that cannot provide non-volatile storage
for the entPhysicalSerialNum strings are not required to
implement write access for this object.
              
Not every physical component will have a serial number, or
even need one.  Physical entities for which the associated
value of the entPhysicalIsFRU object is equal to 'false(2)'
(e.g., the repeater ports within a repeater module) do not
need their own unique serial numbers.  An agent does not
have to provide write access for such entities and may
return a zero-length string.
              
If write access is implemented for an instance of
entPhysicalSerialNum and a value is written into the
instance, the agent must retain the supplied value in the
entPhysicalSerialNum instance (associated with the same
physical entity) for as long as that entity remains
instantiated.  This includes instantiations across all
re-initializations/reboots of the network management system,
including those resulting in a change of the physical
entity's entPhysicalIndex value.

MIB

ENTITY-MIB

OID

.1.3.6.1.2.1.47.1.1.1.1.11

Type

column

Access

readwrite

Status

current

Parent

entPhysicalEntry

Groups

1