For the NSM, I guess you may not know where to find the steps:
(i) Via NSM
- Right Click on the device
- Select View Statistics
- Go to Resource Statistics
- Select Session Utilization or Active Status which should show all the sessions as well
Also note that there is a file size limit for all the tools which Cesar has mentioned.
For :https://tools.juniper.net/fsa/ (not larger than 32MB) and same for the NSSA (I have had huge session files which were not able to be parsed by the NSSA tool).
In that case the only way is to use linux to parse the session file something like this:
grep -A 1 id filename> | grep -v id | grep if | awk '{print $3}' | awk -F: '{print $2}' | awk -F, '{print $1}' | sort | uniq -c | sort -nr | more or > <filename for analysis>
*note above is just an example, of course there are many ways to do the analysis.
Also, you can use the private netscreen MIBs for session utilization (not really doing session analysis):
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