Appendix A RMON alarm variables 209Configuring Network Managementdot3StatsInternalMacReceiveErrorsA count of frames for which transmission on aparticular interface fails due to an internal MACsublayer transmit error. A frame is only counted by aninstance of this object if it is not counted by thecorresponding instance of either thedot3StatsLateCollisions object, thedot3StatsExcessiveCollisions object, or thedot3StatsCarrierSenseErrors object.The precise meaning of the count represented by aninstance of this object is implementation specific. Inparticular, an instance of this object may represent acount of transmission errors on a particular interfacethat are not otherwise counted.IP ipInHdrErrors.0 The number of input datagrams discarded due toerrors in their IP headers, including bad checksums,version number mismatch, other format errors,time-to-live exceeded, and errors discovered inprocessing their IP options.ipInDiscards.0 The number of input IP datagrams for which noproblems were encountered to prevent their continuedprocessing but that were discarded (for example, forlack of buffer space). Note that this counter does notinclude any datagrams discarded while awaitingreassembly.ipOutDiscards.0 The number of output IP datagrams for which noproblem was encountered to prevent theirtransmission to their destination but that werediscarded (for example, for lack of buffer space).Note that this counter would include datagramscounted in ipForwDatagrams if any such packets metthis (discretionary) discard criterion.ipFragFails.0 The number of IP datagrams that have beendiscarded because they needed to be fragmented atthis entity but could not be, for example, because theirDon’t Fragment flag was set.ipReasmFails.0 The number of failures detected by the IP reassemblyalgorithm (for whatever reason: timed out, errors, andso forth). Note that this is not necessarily a count ofdiscarded IP fragments because some algorithms(notably the algorithm in RFC 815) can lose track ofthe number of fragments by combining them as theyare received.icmpInParmProbs.0 The number of ICMP In parameter problem messagesreceived.Table 65 Alarm variables (continued)Category Subcategory Variable Definition
