[mrtg] ifInOctets but no ifOutOctets.... ever seen this?

Gene Titus gene at ots.utsystem.edu
Wed Jul 21 17:03:04 CEST 2010

Hey Steve,

Thanks for the response.  Since you also have this problem, we won't pursue
the matter with Cisco as a bug. And again, I only see this problem on 2 of
our new switches, not the dozen+ older cisco switches we have. I'll just
Target the ifInOctets twice.

Even more strange, these switches don't have ifOutOctets entries but the do
have ifOutUcastPkts entries for unrouted vlans. And yes, ifOutUcastPkts =


On Tue, Jul 20, 2010 at 4:40 PM, Steve Shipway <s.shipway at auckland.ac.nz>wrote:

>  I have also noticed this on the unrouted vlans on our Cisco switches.  I
> assume it is just a peculiarity of the switch, to do with the way unrouted
> vlans work.  Maybe since *in* would be equal to *out* they don’t bother
> with holding a counter for *out*?
> Steve
> I've got a weird problem. I've run mrtg (and rtg) against Junipers routers,
> cisco switches, and several other network device for many years. I generate
> my own mrtg config files, create my own rrd files, and have custom graphing
> routines. But I've never run into this problem.
> We just add some cisco ios switches to our network. They're configured with
> several "unrouted vlan". I can usually traffic monitor unrouted vlans
> without problem. But on these switches, the unrouted vlans have ifInOctet
> counters but no ifOutOctet counters.

Gene Titus
Sr Operating System Specialist
The Office of Telecommunication Services
The University of Texas at Austin
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