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In Configure RMON Alarms&Events by script I’ve shown a short python-algorithm to to discover all Cisco class-based QoS (cbQoS) packet-/drop-counters and to generate RMON-alarms for each. The router monitors these counters every 300s, calculates the delta for the interval and raises RMON-events when there were packets/drops or when the have been before but not anymore. This RMON-event has been configured as an syslog-message to an syslog-receiver etc. The existing script just generated a list of cli-commands which had to be entered manually to the router-config. Not a valid aproach when having hundreds devices to be configured. Now i want the script to automatically configure theRead More →

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Stop frequent polling of everything, please! Last week I had to troubleshoot a network of a customer which was overwhelmed with SNMP-Queries – it wasn’t the first one. All Switch- and Router-CPUs have been at high level, since every tiny counter was polled at high rate. To provide real-time graphs to the top-level-management. Which hopefully don’t waste time to watch these colourful pictures all day for entertainment purposes. Doesn’t anybody remember RMON? Years ago I’ve been teaching routing&switching-classes as a full-time Cisco/BayNetworks/Fluke-instructor, and in every switching class there was a brief explanation about SNMP. And about RMON. RFC2819 – RMON (Remote Network Monitoring) MIB 4Read More →