[mrtg] Re: MRTG Conversion

[tony bourke]

Hello Steven,

MRTG get's it's info from the SNMP agent, which gets the information from
the network stack.  You are probably looking at packets total in the
router output, and bits or bytes in and out as a rate in MRTG.

The router keeps track of octets (same as bytes, octo=8, 8 bits in a byte)
in and out of any given interface.  MRTG just counts this and divides by
the number of seconds since it's last poll, and gives you a rate such as
1.705 Megabits/second.

The output from the router you've pasted is where the router has checked
it's on records and shows you the counters (not rate) for packets (not
octets/bytes).  It just shows how many times a packet has passed in or
out, and not the rate they've passed in or out.

Hope that helps,

Tony


On
Wed, 24 Apr 2002, Steven K. wrote:

>
> I'm trying to figure out how MRTG Converts this Data into the following.
>
> On My router I get this
> #.....................................................................
> ATM2/0.2 is up, line protocol is up
>   Hardware is ENHANCED ATM PA
>   Description: - <My Interface Description>
>   Internet address is <MyIp_address>
>   MTU 4470 bytes, BW 3000 Kbit, DLY 190 usec,
>      reliability 255/255, txload 34/255, rxload 8/255
>   Encapsulation ATM
>   33278048 packets input, 7878651880 bytes
>   21583277 packets output,9320447425 bytes
>   36154 OAM cells input, 36157 OAM cells output
>   AAL5 CRC errors : 0
>   AAL5 SAR Timeouts : 0
>   AAL5 Oversized SDUs : 0
> #---------------------------------------------------------------------------
> -------
> And This is what MRTG Graphs (5 Min Average)..................
> (there could be a difference for a few Minutes but not a big change on
> traffic)
>
> Maximal In     1.705M	(31.88%)
> Maximal Out    2.802M	(55.01%)
> Average In     684.704k (14.26%)
> Average Out    746.942k	(15.56%)
> Current In     695.294k	(14.49%)
> Current Out    547.486k	(11.41%)
>
> I know that the Info in MRTG is correct (This is a 3M ATM Link)
>
> Can someone please help me do the small Maths that is graphed.
>
> Thanks
> Steven
>
>
>
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