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Why does my Cisco IP SLA sensor show "UP"?

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I have a simple ip sla as follows: ip sla 100 icmp-echo 192.xxx.xxx.xxx timeout 100 frequency 1 ip sla schedule 100 life forever start-time now

The destination ip is non-existent, so the stats show as follows:

Round Trip Time (RTT) for Index 100 Latest RTT: NoConnection/Busy/Timeout Latest operation start time: 10:53:42.717 BST Wed Mar 31 2010 Latest operation return code; Timeout Number of successes: 0 Number of failures: 1506 Operation time to live: Forever

QUESTION: In PRTG I have created the device, added a Cisco IP SLA sensor for, but it is showing as UP! not down as I would expect. What am I doing wrong? Thanks, Tim

cisco ip-sla prtg snmp

Created on Mar 31, 2010 9:59:56 AM

Last change on Mar 31, 2010 2:40:01 PM by Daniel Zobel [Product Manager]



6 Replies

Accepted Answer

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the sensor in PRTG is configured on the device you set up the IP SLA on, and that device returns a value so the sensor shows as UP.

It does not mater if the returned value is 0 or something else.

Created on Mar 31, 2010 12:39:10 PM by Aurelio Lombardi [Paessler Support]

Last change on Mar 31, 2010 12:39:31 PM by Aurelio Lombardi [Paessler Support]



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Can someone explain how to configure the sensor so that it goes 'Down' and sends a notification if the ICMP Ping times out in the IP SLA?

Thanks!

Created on Jan 24, 2018 7:20:29 PM



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BlueMPaessler, thank you for the KB-Post. Which values does the IP-SLA Sensor show in that moment? If 0-values, would it be possible to work with a simple error limit then?

Created on Jan 25, 2018 9:57:27 AM by Torsten Lindner [Paessler Support]



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Actually, it returns no value at all and shows 'Error' during the IP SLA timeout.

Thanks!

Created on Jan 25, 2018 3:44:30 PM



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BlueMPaessler, can you share a screenshot showing the full error message of the sensors "Log"-Tab? Thank you!

Created on Jan 26, 2018 10:22:26 AM by Torsten Lindner [Paessler Support]



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Apologies. The sensor does in fact properly change to a 'Down' state and does properly send notifications when the IP SLA times out. All good here.

Thanks!

Created on Jan 26, 2018 8:08:04 PM




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