SNMP MIB Objects
E-53160-A2-GB21-50 January 1997
Interface Group – “ifOperStatus” Object (ifEntry 8)
This object specifies the current operational state of the
interface. The value of this object for each interface is
defined as follows:
Network T1: The interface is up(1) when no
alarm conditions exist.
The interface is down(2) when an
alarm condition is active.
The interface is testing(3) when a
test is active on the interface.
DTE T1: The interface is up(1) when no
alarm conditions exist and the
interface is enabled.
The interface is down(2) when an
alarm condition is active and the
interface is disabled.
The interface is testing(3) when a
test is active on the interface.
COM Port: When configured as an SNMP
management link, up and down are
based on the current state of the
link layer protocol. Otherwise, the
interface is always up(1).
The interface is never in the
testing(3) state.
AUX Port: When configured as an SNMP
management link, up and down are
based on the current state of the
link layer protocol. Otherwise, the
interface is always down(2).
The interface is never in the
testing(3) state.
MODEM Port: When configured as an SNMP
management link, up and down are
based on the current state of the
link layer protocol. Otherwise, the
interface is always up(1) when the
modem is connected and down(2)
when the modem is not connected.
The interface is never in the
testing(3) state.
Data Ports: The interface is up(1) when the
port is assigned to a T1 interface or
another data port as a backup, and
both CTS and DSR are ON.
The interface is down(2) when the
port is unassigned, or either CTS
or DSR is OFF.
The interface is testing(3) when a
test is active on the interface.
Interface Group – “ifLastChange” Object (ifEntry 9)
This object contains the value of “sysUpTime” at the
time the interface entered its current operational state.
Interface Group – Input Counters(objects ifEntry 10 to ifEntry 15)
These objects collect statistics on the data received by
the COM port, the AUX port, and the MODEM port when
these ports are configured as SNMP management links.
For interfaces that are not configured as an SNMP
management link, these statistics are not provided and an
error status is returned if access is attempted. The objects
used to collect input statistics are listed below:
•ifInOctets (ifEntry 10)
•ifInUcastPkts (ifEntry 11)
•ifInNUcastPkts (ifEntry 12)
•ifInDiscards (ifEntry 13)
•ifInErrors (ifEntry 14)
•ifInUnknownProtos (ifEntry 15)