IP SLA react MOS not alerting

[JW_UK]

Hi there,

I would like to use IP SLA UDP Jitter to alert when the MOS score is greater than 3.5.

My config:

ip sla 2
udp-jitter 1.1.5.1 5000 codec g711alaw
tos 184
threshold 60
timeout 500
frequency 15
history hours-of-statistics-kept 1
history enhanced interval 900 buckets 100

ip sla logging traps

ip sla schedule 2 life forever start-time now

ip sla reaction-configuration 2 react mos threshold-value 350 349 threshold-type immediate action-type trapOnly

event manager applet linkPoor-mos
event syslog pattern "Threshold exceeded for mos"
action 1.0 syslog msg "internet sla breach for mos"

IP SLA result:

branch1#sh ip sla st 2
IPSLAs Latest Operation Statistics

IPSLA operation id: 2
Type of operation: udp-jitter
Latest RTT: 23 milliseconds
Latest operation start time: 14:28:24 UTC Fri Jun 5 2020
Latest operation return code: OK
RTT Values:
Number Of RTT: 951 RTT Min/Avg/Max: 1/23/27 milliseconds
Latency one-way time:
Number of Latency one-way Samples: 0
Source to Destination Latency one way Min/Avg/Max: 0/0/0 milliseconds
Destination to Source Latency one way Min/Avg/Max: 0/0/0 milliseconds
Jitter Time:
Number of SD Jitter Samples: 904
Number of DS Jitter Samples: 926
Source to Destination Jitter Min/Avg/Max: 0/8/1000 milliseconds
Destination to Source Jitter Min/Avg/Max: 0/9/1001 milliseconds
Over Threshold:
Number Of RTT Over Threshold: 0 (0%)
Packet Loss Values:
Loss Source to Destination: 24
Source to Destination Loss Periods Number: 43
Source to Destination Loss Period Length Min/Max: 1/2
Source to Destination Inter Loss Period Length Min/Max: 1/77
Loss Destination to Source: 25
Destination to Source Loss Periods Number: 24
Destination to Source Loss Period Length Min/Max: 1/2
Destination to Source Inter Loss Period Length Min/Max: 1/133
Out Of Sequence: 0 Tail Drop: 0
Packet Late Arrival: 0 Packet Skipped: 0
Voice Score Values:
Calculated Planning Impairment Factor (ICPIF): 14
MOS score: 3.96
Number of successes: 21
Number of failures: 0
Operation time to live: Forever

The results are showing a MOS score of 3.96 but the alert does not happen.

Any ideas on this one?

[JW_UK · Accepted solution]

My bad, figured it out

For MOS monitoring, the SYSLOG messages need to be read or actioned upon differently to standard RTT.

For example a high MOS score score of 5 indicates excellent quality, whereas a low score of 2 indicates poor quality.

For RTT the opposite applies, e.g a high RTT is bad.

To recognise this the IP SLA react trigger alert logic need to be reversed for example:

%RTT-3-IPSLATHRESHOLD: IP SLAs(10): Threshold below for mos	This alert indicates a bad mos score (lower)
%RTT-3-IPSLATHRESHOLD: IP SLAs(10): Threshold exceeded for mos	This alert indicates a good mos score (higher)