New Question
 
 
PRTG Network Monitor

Intuitive to Use.
Easy to manage.

200.000 administrators have chosen PRTG to monitor their network. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free PRTG
Download >>

 

What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general. You are invited to get involved by asking and answering questions!

Learn more

 

Top Tags


View all Tags


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

Votes:

0

Your Vote:

Up

Down

How does PRTG interpret the transmitted "kbits per second" in the SNMP RMON sensor’s primary channel? Is it the sum of in- 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 May 21, 2019 12:33:09 PM by  Maike Behnsen [Paessler Support]



1 Reply

Accepted Answer

Votes:

0

Your Vote:

Up

Down

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 May 21, 2019 12:46:35 PM by  Maike Behnsen [Paessler Support]



Please log in or register to enter your reply.


Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.