how to add one GE traffic to another GE?

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:publicA.B.C.D:::::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:publicA.B.C.D:::::2 + 
\GigabitEthernet0/2:publicA.B.C.D:::::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:publicwellfleetA + 1:publicwellfleetA
 Target[ezwf]:
1.3.6.1.4.1.999.1&1.3.6.1.4.1.999.2:publicmydevice
/
     1.3.6.1.4.1.999.3&1.3.6.1.4.1.999.4:publicmydevice
* 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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