[mrtg] Re: 3Com SuperStack Switch 3000

Graeme Fowler G.E.Fowler at lboro.ac.uk
Tue Nov 16 16:37:12 MET 1999

On 16-Nov-1999 Vivian Lee wrote:
> MRTG detects thirteen interfaces for a 12-port  3Com switch.  I am
> trying to determine what's the extra interface.  Anyone has an idea? 
> Thanks.  
> note: The plug-in module (port 13) is not installed.  

That will either be the IP address of the unit itself, the SLIP
interface or the serial console port. It depends on the software
version/modules you have installed.

Assuming you have access to a MIB browser (or just plain old snmpwalk
on UNIX) try looking for the following OID section:

[graeme at mrtg] snmpwalk **** publicinterfaces.ifTable.ifEntry.ifDescr

interfaces.ifTable.ifEntry.ifDescr.1 = "3Com Switch"
interfaces.ifTable.ifEntry.ifDescr.2 = "3Com Switch  type:SLIP"
interfaces.ifTable.ifEntry.ifDescr.101 = "RMON:10/100 Port 1"
interfaces.ifTable.ifEntry.ifDescr.102 = "RMON:10/100 Port 2"
interfaces.ifTable.ifEntry.ifDescr.103 = "RMON:10/100 Port 3"
interfaces.ifTable.ifEntry.ifDescr.104 = "RMON:10/100 Port 4"
interfaces.ifTable.ifEntry.ifDescr.105 = "RMON:10/100 Port 5"
interfaces.ifTable.ifEntry.ifDescr.106 = "RMON:10/100 Port 6"
interfaces.ifTable.ifEntry.ifDescr.107 = "RMON:10/100 Port 7"
interfaces.ifTable.ifEntry.ifDescr.108 = "RMON:10/100 Port 8"
interfaces.ifTable.ifEntry.ifDescr.109 = "RMON:10/100 Port 9"
interfaces.ifTable.ifEntry.ifDescr.110 = "RMON:10/100 Port 10"
interfaces.ifTable.ifEntry.ifDescr.111 = "RMON:10/100 Port 11"
interfaces.ifTable.ifEntry.ifDescr.112 = "RMON:10/100 Port 12"
interfaces.ifTable.ifEntry.ifDescr.113 = "ATM Port 13, ATM"

You should get something similar. Plus the descriptions should also be
reported by cfgmaker anyway...


Graeme Fowler
Network Officer, Infrastructure & Networks Group
Loughborough University Computing Services
+44 1509 228426

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