You should not be looking in these files. The SNMP timeout and retries are tied to credentials, and can be configured in the GUI. If you post the CSDiscovery.log and the CSDiscovery-config.xml, I can analyze them. We have seen some problems with large discoveries, and this might be memory-related.
Your timeouts are all the default. These are configured at the same place you added your SNMP community strings for Discovery. The default is 2 retries with a 3 second timeout. One issue I did notice was that you have non-UTF-8 characters in one of your community string comments (the one for 172.*.*.*). This is breaking the file. Please change this comment.
You may also have a timeout issue. Even with the default values, a timeout will take 21 seconds (per string per device). The only way to debug this is with the ngdiscovery log with debugging enabled. But as you say, that will be big. Therefore, I recommend you open a TAC service request. You can then upload the logs via FTP for further analysis.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...