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Estimate IFInOctets on multilink interface

 
 
anti00@poczta.onet.pl
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      11-22-2005
HEllo,
I have a multilink interface (index 50) contains two FR links (index 40
and 41).

I want to know what is a load of multilink. So I tryed to monitor
ifInOctets related with multilink interface.

I also monitored ifInOctets related with two FR links (index 40 and
41).

The sum of ifInOctets for two FR links (index 40 and 41) is greater
then the ifInOctets on multilink interface.

Why ? Did I miss something ?
Here are the values
first FR link - IF-MIB::ifInOctets.40 = Counter32: 707734249
second FR link IF-MIB::ifInOctets.41 = Counter32: 707752478
multilink - IF-MIB::ifInOctets.50 = Counter32: 1388116339

anti00

 
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Martin Gallagher
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      12-01-2005
On Tue, 22 Nov 2005 02:39:14 -0800, anti0 wrote:

> The sum of ifInOctets for two FR links (index 40 and 41) is greater then
> the ifInOctets on multilink interface.
>
> Why ? Did I miss something ?


That's because there are a few bytes, L2 encapsulation, and frames, LMI
etc. that are sent received on the FR links that don't go through the
multilink i/f, so the total rx/tx on the bundle members will be a little
bit more than what the multilink interface sees.

--
Rgds,
Martin
 
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