Can I use RNRP log buffer clearance procedure in live system without hesitation?
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I would consider it safe to do this at any time.
Instead of targeting each node one-by-one you can substitute the IP-address in the parameters with the RNRP areas's multicast address which can be calculated as follows:
239.239.239.x where x=RNRP Area x 4, eg 220.127.116.11 to target all nodes on area 20.
When using the multicast tweak, the command must be issued from a node with physical connection to the area in regard as multicasted telegrams does normally not travel across a router node.