Re: How to monitor bandwidth on Catalyst via SNMP?
Are you saying ifSpeed. is changing value from one poll to the next? What kind of interface is it? Sounds like a bug, or an error in polling. Please post the snmpwalk of ifDescr, ifType, and ifSpeed.
For the ifHighSpeed issue, from the IF-MIB entry about that object: "For a sub-layer which has no concept of bandwidth, this object should be zero." Are you polling ifHighSpeed on a sub-layer interface?
Bandwidth utilization is always calculated by taking multiple readings of in or out counters. There will not be a separate counter kept in our snmp agent, when separate values already exist and can be calculated. Thus, since you can use ifSpeed and poll ifInOctets to get the delta, and then calculate the result, our snmp agent will not contain the utilization number.
If you want a graph of bandwidth utilization over time, I would suggest obtaining MRTG. It is available free of charge over the web, just search for MRTG download.
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