E-53170-A2-GB20-20 December 1996Interface Group – “ifLastChange” Object(ifEntry 9)This object contains the value of “sysUpTime” at thetime the interface entered its current operational state. Forthe E1 DSU/CSU, this object is only updated for the “up”and “down” states. This is done since the “testing” state isnot mutually exclusive with the “up” and “down” states.Interface Group – Input Counters(objects ifEntry 10 to ifEntry 15)These objects collect statistics on the data received bythe COM port and the AUX port when these ports areconfigured as SNMP management links. For interfacesthat are not configured as an SNMP management link,these statistics are not provided and an error status isreturned if access is attempted. The objects used to collectinput statistics are listed below:• ifInOctets (ifEntry 10)• ifInUcastPkts (ifEntry 11)• ifInNUcastPkts (ifEntry 12)• ifInDiscards (ifEntry 13)• ifInErrors (ifEntry 14)• ifInUnknownProtos (ifEntry 15)Interface Group – Output Counters(objects ifEntry 16 to ifEntry 21)These objects collect statistics on the data received bythe COM port and the AUX port when these ports areconfigured as SNMP management links. For interfacesthat are not configured as an SNMP management link,these statistics are not provided and an error status isreturned if access is attempted. The objects used to collectoutput statistics are listed below:• ifOutOctets (ifEntry 16)• ifOutUcastPkts (ifEntry 17)• ifOutNUcastPkts (ifEntry 18)• ifOutDiscards (ifEntry 19)• ifOutErrors (ifEntry 20)• ifOutQLen (ifEntry 21)IP Group, MIB IIThe IP Group objects are supported by the E1DSU/CSU for all data paths which currently areconfigured to carry IP data to or from the E1 DSU/CSU,including the COM, AUX, EDL, and FDL. All of theobjects in the IP Group other than the IP AddressTranslation table are fully supported. The IP AddressTranslation table (ipNetToMediaTable) does not apply tothe E1 DSU/CSU and will be empty (i.e., have zeroentries). The following sections provide clarification forobjects contained in the IP Group when it is not clear howthe object definition in MIB II is related to the E1DSU/CSU.IP Group – “ipForwarding” Object (ip 1)This object specifies whether the unit is acting as an IPgateway in respect to the forwarding of a datagramreceived by, but not addressed to, this unit. Only thefollowing value is supported by the E1 DSU/CSU.• forwarding(1) – The unit is acting as a gateway.IP Group – “ipAddrTable” Object (ip 20)The address table is supported by the E1 DSU/CSU.IP Group – “ipAdEntAddr” Object(ipAddrEntry 1)The ipAdEntAddr object is an IP address supported bythe device and serves as the index to the address table.Since indexes for tables must be unique, only one ifIndexmay be displayed for each IP address supported by thedevice. If you have configured the same IP address formultiple interfaces or for default IP addresses, you willnot see all interfaces that support a particular IP addressupon display of the ipAddrTable.IP Group – “ipAdEntIfIndex” Object(ipAddrEntry 2)For some address table entries, the ipAdEntIfIndexobject may have a value greater than ifNumber. In thesecases, the ipAdEntIfIndex refers to a proprietary interfacewhich is not currently implemented by the interface groupof MIB II.