I've recently replaced my cisco 3750 switches with Cisco 3850, and now PRTG won't detect Port-Channels, has anyone come across this?

Article Comments

Attention: This article is a record of a conversation with the Paessler support team. The information in this conversation is not updated to preserve the historical record. As a result, some of the information or recommendations in this conversation might be out of date.

The Port-Channel is a proprietary technology from Cisco, different vendors (or somethimes different devices even) will have different ways of reporting this data via SNMP:

  • In some cases you may see the interface listed(When using Add Sensor > SNMP Traffic Sensor) but you may find out that the interface doesn't provide traffic counters, thus the bandwidth is always 0 bytes/sec.
  • In other cases, the port-channel may not even be listed when using the "Add Sensor > SNMP Traffic" dialog.

What you can do to workaround this is is monitor the physical interfaces (for traffic) and use a Sensor Factory Sensor to aggregate the data from multiple sensors.

You may also experience similar issues regarding the monitoring of VLAN-interfaces, they also behave differently based on each vendor's implementation.

Best Regards,


Feb, 2016 - Permalink