I'm using version 16.3.7 of the C3650.increase the logging buffer size to 16000 andIf you increase the logging buffer level to informational, the size goes back to 4096.Are there any setting criteria that I do not know?
Default size 4096, that can be increased based on the availability.
show memory will give you what is available. you can not increase more than available.
here is reference document :
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