[mrtg] ifIndex on Cat 5s and cfgmaker

Senthilvel Rangaswamy senthilr at Eng.Sun.COM
Sat Apr 15 02:24:26 MEST 2000


I use mrtg to monitor every port on the switch. [Cat 5500]. I use
cfgmaker to prepare mrtg.cfg. I was wondering how cfgmaker gets
the ifIndex numbers. I am asking this because cfgmaker adds
targets that are not present at all. It finds ifIndex numbers which
I cannot find when I do "sh po ifindex" on the switch. Also, this
section of target is not commented out as unreachable.

Because of this, mrtg tries to get information for this ifIndex
and gets unreachable errors. I could reduce the run-time greatly
if I could fix this issue.

A typical error:

SNMP Error:
Received SNMP response with error code
  error status: noSuchName
  index 1 (OID:
SNMPv1_Session (remote host: "xxxxx" [a.b.c.d].161
                  community: "public"
                 request ID: 681840737
                PDU bufsize: 8000 bytes
                    timeout: 2s
                    retries: 5
                    backoff: 1)
SNMPGET Problem for ifInOctets.324 ifOutOctets.324 sysUptime sysName
ifDescr.324 on public at xxxxx
SNMPGET: Failed to reach target: "324:public at xxxxx". I tried multiple
times! public at xxxxx


"Historically speaking, the presence of wheels in Unix has never 
 precluded their reinvention." 
                                                    - Larry Wall

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