Welcome to the CSIR Meraka Institute's "COIN" Blog

Sunday, October 02, 2005

Making sense of LQ ILQ and ETX in OLSR

You will see a table like this in the OLSR status screen on Freifunk

Topology entries

Destination IPLast hop IPLQILQETX
10.51.1.1310.51.1.101.001.001.00
10.51.1.2010.51.1.101.001.001.00
10.51.1.110.51.1.130.901.001.11
10.51.1.1010.51.1.131.001.001.00
10.51.1.1210.51.1.131.000.901.11
10.51.1.1410.51.1.130.901.001.11
10.51.1.2010.51.1.131.001.001.00
10.51.1.1310.51.1.141.000.901.11
10.51.1.110.51.1.200.900.751.49
10.51.1.1010.51.1.201.001.001.00
10.51.1.1210.51.1.201.001.001.00
10.51.1.1310.51.1.201.001.001.00


LQ = The percentage of packets that are succesfully sent from youself to the neighbour

ILQ = The percentage of packets that succesfully are sent from your neighbour to yourself also often called NLQ

ETX = Expected Trasnmission count = How many trasnmission attempts are required to get packets through = 1 / (LQ*ILQ)

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rene said...

Hi,
it seems to me that LQ and ILQ are the other way around. Just check
http://www.olsr.org/docs/README-Link-Quality.html

regards,
Rene