The value of the object tmnxLocUsrDbPppoeMaskSufStr specifies
a substring that is stripped of the end of the incoming string
before it is matched against the value configured in the
corresponding object in the tmnxLocUsrDbPppoeTable.
This string can only contain printable ASCII characters.
Character '*' is a wildcard that matches any substring; it can be
escaped by character '\'.
At least one of the values of tmnxLocUsrDbPppoeMaskSufNum and
tmnxLocUsrDbPppoeMaskSufStr must be equal to the default value.