[mrtg] Re: Cisco 7500 CAR or VLAN Monitoring ...

Daniel J McDonald dan.mcdonald at austinenergy.com
Fri May 2 14:07:11 MEST 2003

On Thu, 2003-05-01 at 16:59, Joe Graeber wrote:
> Hey all,
> I'm working on getting MRTG to monitor either VLAN Interfaces or CAR on a
> Cisco 7500 Series Router.  I would probably prefer to monitor the
> sub-interface (vlan) as I can then simply implement CAR on the sub-interface
> and verify whether or not it's working based on the graphs.
> Since I already have CAR configured on the sub-interface, I attempted to
> monitor gig1/0/0.55 and I get a NoSuchname with getcfg.  Does anyone have
> any suggestions on how to monitor these subinterfaces with MRTG?

The difficulty is that the counters appear in only the very latest
versions of IOS.  The CAR counters don't show up either, so that's not a
workaround, because the CAR counters reference ifIndex, and if there is
no ifIndex value, there is no way to create them.  I opened up a bug on
that back in 12.1.5T days (well over 18 months ago) and they sat on it
past the drop-dead date for getting it into 12.2, so it's in 12.2T,
starting with 12.2(8)T, and it's also in 12.2(13)ZE.

Needless to say, I haven't upgraded any routers to take advantage of
this mib.

As a potential workaround, isl encapsulated vlans are supposed to be in
the table in 12.2 mainline, but I've never gotten them to work either.

Daniel J McDonald, CCIE 2495, CNX
Austin Energy

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