[mrtg] Re: Cisco questions

[Greg Dickinson]

Thanks for the quick reply :-)

1.) I had kind of thought that - I'm more than likely going to have to
poll the 2600 at the other end of the link.  Time for another "mail
merge config file" ;-)

2.) I ask this question simply because when I first set up MRTG (on the
old IOS version, 12.0) it would mark the DS3 interface as up, but when
MRTG polled the data from the router, the router would return no data. 
This really isn't a customer request, I just thought it would look cool,
to be completely honest :-)  We have another router (a 2600) that has a
DS3 that is configured as a serial interface for internet connectivity,
and it polls that router just fine.  I'll try running cfgmaker against
the router and pulling out the DS3 interface lines, and see if the newer
IOS has this working.

--Greg

>>> <Greg.Volk at edwardjones.com> 9/11/2003 1:10:55 PM >>>
}
}First, a little background: I am monitoring a Cisco 7506 router that
}has 4 DS3's coming into it, each DS3 being slit off into separate
T-1's
}to go to each of our sites.  We recently upgraded the RAM and IOS in
}this router to 12.2(19) and replaced a flaky ethernet interface.
}
}1.) Since the upgrade, the traffic grpahs being generated look like a
}porcupine :-)   (to see what I'm talking about, visit
}http://207.157.9.161/cgi-bin/mrtg.cgi?dir=cisco/ )  Has anyone 
}else seen
}this, and is it normal?  Before all the hardware/IOS upgrades, the
}traffic graphs looked rather smooth, like the ethernet 
}interfaces at the
}top of the aforementioned page.
}
It sounds like the snmp counters aren't getting updated quickly enough

- 
it's taking more than five minutes to get a change from one poll cycle

to
the next. The fact that the ethernet interface data looks correct 
validates
your mrtg configuration to a certain degree and tends to point the 
finger  
at a SNMP problem on DS-3 port adaptor on the cisco. I don't have any 
DS3 equipped 7500s, but I can tell you that the DS3-PAs produce 
entirely 
bogus snmp stats when plugged into a 7206 running 12.2(7a). And I think

these are the same DS3-PA's that plug into a 7500 vip. So maybe it's a
problem with the way IOS gets counter data from the DS3-PAs(?). My
advice would be to open a ticket with cisco show them your graphs and
see what they come back with. Chances are they will tell you that an
ios upgrade will fix this problem, and you can take that for what it's
worth. In the short term, if you want stats for those interfaces, get
them from the remote end by polling the remote side router.


}2.) Is there any way to measure the total traffic utilization of each
}DS3, as opposed to having to monitor each T-1 and add the values
}together?
}

Cfgmaker should have generated configs for the DS-3 physical ports at
the same time it hit the subinterfaces. Did you have any --if-filter 
references on your cfgmaker comamnd line that would have excluded the
phy ports? Is the phy port in the cfg file, but is commented out for
some reason? I've seen various ATM interfaces get commented out
because
the router tells cfgmaker that the interface is link down, but it's
really not - another IOS bug - so that particular ATM int gets
commented
out in the mrtg cfg file. You can manually work around this by 
uncommenting
the config - but the counters may still be wrong.



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