| Description | The value of ifIndex that identifies the
lower-level interface over which this PPP Link
is operating. This interface would usually be
an HDLC or RS-232 type of interface. If there
is no lower-layer interface element, or there
is no ifEntry for the element, or the element
can not be identified, then the value of this
object is 0. For example, suppose that PPP is
operating over a serial port. This would use
two entries in the ifTable. The PPP could be
running over `interface' number 123 and the
serial port could be running over `interface'
number 987. Therefore, ifSpecific.123 would
contain the OBJECT IDENTIFIER ppp
pppLinkStatusPhysicalIndex.123 would contain
987, and ifSpecific.987 would contain the
OBJECT IDENTIFIER for the serial-port's media-
specific MIB. |