hello,everyone!
This is my first time of using this mail-lists,and my English is
poor,so please help me and thanks very much!
I use mrtg to monitor the traffic of a GE for a long time,it works
very good.
(config :Target[GigabitEthernet0_2]:
\GigabitEthernet0/2:[EMAIL PROTECTED]:::::2）
Yesterday， I planned to add the traffic of GE0/2 to GE0/1，then I
found it didn't work.
(config :Target[GigabitEthernet0_1_and_0_2]:
\GigabitEthernet0/1:[EMAIL PROTECTED]:::::2 +
\GigabitEthernet0/2:[EMAIL PROTECTED]:::::2）
I read the mrtg preference doc,it says:"
Multi Target Syntax
You can also combine several target definitions in a mathematical
expression. Any syntactically correct expression that the Perl interpreter
can evaluate to will work. An expression could be used, for example, to
aggregate both B channels in an ISDN connection or to calculate the
percentage hard disk utilization of a server from the absolute used space
and total capacity.
Examples:
Target[ezwf]: 2:[EMAIL PROTECTED] + 1:[EMAIL PROTECTED]
Target[ezwf]: 1.3.6.1.4.1.999.1&1.3.6.1.4.1.999.2:[EMAIL PROTECTED] /
1.3.6.1.4.1.999.3&1.3.6.1.4.1.999.4:[EMAIL PROTECTED] * 100
Note that whitespace must surround each target definition in the
expression. Target definitions themselves must not contain whitespace,
except in interface descriptions and interface names, where each whitespace
character is escaped by a backslash.
MRTG automatically rounds the result of the expression to an integer unless
RRDTool logging is in use and the gauge option is in effect for the target.
Internally MRTG uses Perl's Math::BigFloat package to calculate the result
of the expression with 40 digits of precision. Even in extreme cases,
where, for example, you take the difference of two 64-bit integers, the
result of the expression should be accurate. "
So I think,maybe,because " MRTG uses Perl's Math::BigFloat package to
calculate the result of the expression with 40 digits of precision",but
SNMPv2 use 64-bit counters,so I can't get the accurate result.
Now how can I resovle this problem? thanks very much !
wangli_7805
2006-05-12
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