An entry exists for each interface, if REP is configured on it.
On a system that supports REP, all ports with ifType =
'ethernetCsmacd' and those ethernet based virtual ports with
ifType = 'propVirtual' also support REP.
REP can be configured or unconfigured or modified directly on
the agent as well.
Dynamically created rows are expected to be non-volatile
such that they persist after an agent restarts.