Information about a particular physical equipment, logical
entity to external identifier binding. Each logical
entity/physical component pair may be associated with one
alias mapping. The logical entity index may also be used as
a 'wildcard' (refer to the entAliasLogicalIndexOrZero object
DESCRIPTION clause for details.)
Note that only entPhysicalIndex values that represent
physical ports (i.e., associated entPhysicalClass value is
'port(10)') are permitted to exist in this table.