An entry in this table is created when the result of a OAM
'macQuery' probe is determined. The initial 2 instance identifier
index values identify the tmnxOamPingCtlEntry that a OAM probe result
(tmnxOamMacPingHistoryEntry) belongs to. The tmnxOamMacPingHistoryIndex
identifies a group of replies received in response to a specific
probe transmission. The tmnxOamMacPingReplyIndex selects a single
OAM 'macQuery' reply.
The tmnxOamMacPingL2MapIndex selects a single L2 mapping entry
within a specific 'macQuery' probe reply.
The agent starts assigning tmnxOamMacPingL2MapIndex values at 1.