[mrtg] Re: Help:monitoring var

[manjunath ramaiah]

Hi ,
Thanks for the help .  I do not have any other mib for the interface and the
agent does not support  mib2 also . Also the card is 1 way and it can receive

only . So i need to graph only the receive varaible which is availble in the
mib .

 If i give the same oid as oid1 and oid2 then 2 gets will be made  even if i
make
maxbytes2 to zero .  so  still i get resource unavailabe problem right ?
if i can make the agent fast ( avoid resource unavailbe prb) ,
then i can give same oid as oid1 and oid2 but still i need to make maxbytes2
zero to avoid plotting same var twice . ? MRTG does not detect that both oids
are same
and ignore the second one .


So  if i need to plot only one var then ,  i have to make maxbytes2 zero and
whatever the oid i give as oid2 does not matter . It may be same oid or
something else . giving same oid twice has no advantage right ?

Pls advice .

Thanks a lot
Manjunath



Jay Hennigan wrote:

> On Thu, 21 Dec 2000, manjunath ramaiah  wrote:
>
> > I am new to mrtg .Please help me  in the following problem .
> > I need to monitor the no.of bytes received by an interface . The
> > interface is controlled by a snmp agent . There is a variable in the
> > enterprise mib
> > which gives the no of bytes received by the interface .
>
> Is there another MIB for that interface that returns two values, both
> transmit and receive?  If so, it's best to use that, and just tell MRTG
> to set the MaxBytes of the one you don't want displayed to zero.

   > I want to graph only this varaible . So i was givinig  only this

> > variable oid
> >  like OID_1:public at router  . But i came to know that it needs 2
> > vars(why?)
> > so i need to give OID_1&OID_2:public at router .
>
> MRTG was designed for graphing exactly two variables, typically the
> bytes received by and the bytes transmitted by a duplex interface.
> This is pretty deeply embedded in things.
>
> > This if i am correct will issue 2 consecutive snmp gets for the same
> > variable
> > and then take average ( which is same as OID's value )  and then plot
> > the
> > var.
>
> Actually, it draws two lines (the default is a green filled area and a
> blue line), one for each of the two variables.
>
> > This  i am not able to do as the agent returns resource un
> > availabe error
> >  if snmp get is made consecutively . It needs some delay between to get
> > requests.
> >
> > So is there any way i can specify only oid1 and get  the value for
> > graphing .
> > like OID_1:public at router.Also is my undrestanding correct .?
>
> Best way:
> Use an interface descriptor that shows both transmit and receive, then
> MaxBytes zero the one you don't want to show.  You can use the minus
> sign to flip them if you want, see the docs.
>
> Ugly Hack:
> Pick any other valid OID on the device for the second variable and
> set MaxBytes2[target]:0 for that target, also null out the legend for
> it. It will poll the other OID and then discard the data.  For example:
>
> Target[foo]: OID_1&OID_<anything_that_doesn't_error>:public at router
> MaxBytes2[foo]:0
> Legend1[foo]: Bytes
> LegendI[foo]: Interface xyzzy receive:
> LegendO[foo]:
>
> This will cause the second line to be at 0, which won't show on the
> graph.
>
> --
> Jay Hennigan  -  Network Administration  -  jay at west.net
> NetLojix Communications, Inc.  NASDAQ: NETX  -  http://www.netlojix.com/
> WestNet:  Connecting you to the planet.  805 884-6323
>
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