The value of tmnxMobPdnS2aPeerTblLastChanged indicates the sysUpTime at
the time of the last modification to tmnxMobPdnS2aPeerTable by adding,
deleting an entry or change to a writable object in the table.
If no changes were made to the table since the last re-initialization
of the local network management subsystem, then this object contains
a zero value.