[mrtg] cfgmaker using selective interface.

Daniel J McDonald dan.mcdonald at austinenergy.com
Wed Jul 23 00:33:34 CEST 2008

On Tue, 2008-07-22 at 16:58 -0500, Mersberger, Robert wrote:
> sub interfaces have the same value 32 and will also be equal to
> $if-is_wan.  Cannot eliminate $if_type =32 becaues this would also
> eliminate se0/0/0

Then maybe use $ifname !~ /\./
which would only select interfaces with a name missing a literal .

> -----Original Message-----
> From: Dan [mailto:mrtg at dandoore.com] 
> Sent: Tuesday, July 22, 2008 4:17 PM
> To: Mersberger, Robert
> Cc: mrtg-bounces at lists.oetiker.ch; mrtg at lists.oetiker.ch
> Subject: Re: [mrtg] cfgmaker using selective interface.
> Mersberger, Robert wrote:
> > Is it possible to setup cfgmaker to only poll specific interfaces? 
> > Example: I have routers with multiple subinterface but I only want to 
> > poll the primary interfaces like fa0/0, fa0/1 and se0/0/0.  I would 
> > like to be able to do this with cfgmaker because right now I run 
> > cfgmaker then edit the created cfg file and either remove or comment 
> > out the interface I do not want to monitor.  This creates problems 
> > when I have to recreate the cfg file after a routers configuration 
> > changes, like when a port speed in up dated.
> There's two ways of doing this that I've used:
> 1. Use filters with cfgmaker - use something like
> '--if-filter=($default_iftype && ($if_is_ethernet || ($if_is_wan &&
> $if_type!=44)))'
> 2. Use a template with cfgmaker and put a condition on target processing
> to match the above criteria with a Perl expression - I do this to filter
> out interfaces that I'm not bothered about and tweak parameters on
> others so it's more flexible than a filter.
> See the template section of the cfgmaker docs and look at 'Template
> Example 1' and you can add an extra condition to the section under
> if(not $problem_lines) to match or reject interfaces that you wish to
> have - I've used a string match on part of the interface name to
> explicitly reject things like vlan interfaces and virtual bits that
> cfgmaker picks up off some cisco routers.
> It's all in http://oss.oetiker.ch/mrtg/doc/cfgmaker.en.html though so
> have a dig.
> Dan.
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