[AusNOG] MRTG and Junos vs ScreenOS

[Colin Stubbs]

At a guess,

1) The SNMP ifIndex values have changed. ifIndex persistence is the default
with Screen/JunOS but the complete upgrade/change of software will have
caused ifIndex values to change.

2) The new O/S has additional interfaces that didn't exist before. e.g.
loopback/NVI/etc/whatever.

3) You've done a rediscover on the device but now MRTG is trying to graph
the old interfaces along with the new ones it has discovered.

Generally speaking you'll want to identify the old RRD files you want to
keep then replace the new interface RRD files with those. Probably some
other tweaking involved, e.g. the interface line rate etc.

With those keywords in mind Google is probably your best bet at this point.



On 29 September 2014 10:04, Andrew Glassock <andrew_glassock at idg.com.au>
wrote:

> Hi all,
>
> Slightly off topic question re MRTG
>
> I have a Juniper SSG550M when first installed it was running ScreenOS on
> it and tracking the 5 interfaces with MRTG - happily working and producing
> traffic graphs for a couple of years.
>
> We have changed the OS on the same hardware so the box is now running
> Junos - and in Juniper speak becomes a J6350.
>
> I have re run the MRTG config but instead of seeing the 5 interfaces that
> are physically in the box I am seeing 20 interfaces being monitored - 7
> showing traffic - 2 interfaces duplicated, 13 with no traffic. The rate on
> the graphs do not match the rate of the physical interfaces.
>
> Any thoughts how to untangle this would be most welcome
>
> Thanks
>
> --
>
> Andrew Glassock
> Manager, Information Systems
>
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