Hi,

I guess Spectrum names the model "<Devicename>_<Index>". If the SNMP agent 
shifts the interface indices, Spectrum will rename the Interface model using 
the new index.
You can configure, what OID Spectrum should use for Interface naming by editing 
the attribute "IfModelNameOption" (0x12a1e)     . Options are:
- ifName
- ifAlias
- ifDescr
- ifIndex 
- Port Description

Check if Spectrum use ifIndex or ifName (default) holds the index. Maybe try 
other attributes.

Regards,
  Christoph

> -----Ursprüngliche Nachricht-----
> Von: Nissel, David [mailto:[email protected]]
> Gesendet: Mittwoch, 28. März 2012 13:07
> An: spectrum
> Betreff: [spectrum] Model name/number ID Changed on Router Interface
> 
> All,
> 
> I have a router that for years, had a serial interface that Spectrum had
> modeled as RouterName_2. Somewhere along the line and unbeknownst to me, the
> interface name changed to RouterName_4. That had the unfortunate byproduct of
> invalidating a SANM rule that I had to alert me when it went offline.
> 
> Anyone see this before and what the cause of it might be? Thanks in advance
> 
> Dave Nissel
> Network Architect
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