You're seeing the INTEGER wrap around from positive to negative
from traps.dat
miscNetRcvdKB snmp.1.3.6.1.4.1.789.1.2.2.2.0 miscNetSentKB snmp.1.3.6.1.4.1.789.1.2.2.3.0
and from the 6.3.1 MIB:
-- miscNetRcvdKB is DEPRECATED; use miscHighNetRcvdBytes -- and miscLowNetRcvdBytes
miscNetRcvdKB OBJECT-TYPE SYNTAX INTEGER ACCESS read-only STATUS mandatory DESCRIPTION "The total number of KBytes received on all the network interfaces, since the last boot." ::= { misc 2 }
-- miscNetSentKB is DEPRECATED; use miscHighNetSentBytes -- and miscLowNetSentBytes
miscNetSentKB OBJECT-TYPE SYNTAX INTEGER ACCESS read-only STATUS mandatory DESCRIPTION "The total number of KBytes transmitted on all the network interfaces, since the last boot." ::= { misc 3 }
In the old (deprecated) form it was defined as INTEGER which has a positive and negative range which wraps from positive to negative on the wrap-around. In the new variables the 64 bit quantities are split into two (high and low) 32 bit Counters (Counters are positive, always increasing values)
You can either do math to accommodate the wraparound to negative (not recommended) or move to the new values and glue the high and low parts together to get a positive 64bit value.
steve. former SNMP peon..
From: "Ed Alexander" Ed.Alexander@renesas.com Date: Fri, 15 Aug 2003 11:50:43 -0700 To: toasters@mathworks.com Subject: SNMP Returns Negative Value for Network Traffic Stats
We use MRTG to monitor filer stats. All has been working well until mid-day yesterday. Now, SNMP queries for network traffic stats (Kbytes sent and received) are returning negative numbers. For example:
[/usr/local/mrtg/filer/bin]# ./snmpget -v 1 yeti public 1.3.6.1.4.1.789.1.2.2.2.0 -79935745 [/usr/local/mrtg/filer/bin]# ./snmpget -v 1 yeti public 1.3.6.1.4.1.789.1.2.2.3.0 -2057424956
What causes this and how do I fix it? The filer is an F820 running DataOntap 6.3.1. Thanks in advance.
Ed
-- Ed Alexander Senior Systems Administrator Renesas Technology America Design Engineering Center - East ed.alexander at renesas.com