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What value does the „Transmitted“ channel of an RMON sensor show?



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How does PRTG interpret the transmitted "kbits per second" in the SNMP RMON sensor’s primary channel? Is it the sum of ingoing and outgoing traffic? Is it comparable to what the SNMP Traffic sensor shows in the Total channel? Or are only octets counted that are received on the monitored interface?

prtg rmon snmp snmp-traffic traffic transmitted

Created on Jan 30, 2014 4:17:37 PM by  Gerald Schoch [Paessler Support]

Last change on Jul 25, 2019 4:58:35 AM by  Maike Guba [Paessler Support]

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This article applies to PRTG Network Monitor 19 or later

The meaning of the SNMP RMON sensor’s Transmitted channel

The SNMP RMON sensor monitors the traffic on an SNMP-compatible device and can show traffic data for each available port. For this purpose, the sensor uses the RMON MIB. Unfortunately, the RFC for this MIB does not exactly describe what is counted in etherStatsOctets (that is, the counter that is used for the Transmitted channel). For a description of the SNMP object etherStatsOctets, refer to Cisco’s SNMP Object Navigator.

Because the description refers to network and not to interface, we usually interpret transmitted as total traffic on the device. This corresponds to the sum of the Traffic in plus Traffic out channels of an SNMP Traffic sensor. Random tests on some HP switches in our labs confirm this assumption, as well as occasional feedback from our customers (for example, for the 3Com Superstack switches 3200, 3300, and 4400).

Apart from that, some manufacturers might interpret etherStatsOctets differently. Considering feedback from PRTG users, switches from D-Link (for example, DES-3200, DGS-3100, DGS-3120, DGS-3240, and DWS-4026) only count octets that go into an interface (Traffic in); the same goes for some Allied Telesyn switches (for example, the AT-3850GB).

Finally, the value that is shown in the Transmitted channel of the SNMP RMON sensor highly depends on the interpretation of your switch’s manufacturer. If the producer of your device does not interpret this counter as traffic total, you can manually rename the Transmitted channel to, for example, Received, depending on what is actually counted.

Created on Jan 30, 2014 4:20:39 PM by  Gerald Schoch [Paessler Support]

Last change on Dec 10, 2020 2:41:07 PM by  Brandy Greger [Paessler Support]

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