Hello @amaizenshtein,
As i image this requires to bgp client like quagga or exabgp to receive full view from your bgp route reflector and track all changes inside mysql. With snmp you wont track all changes and reading full routing table from device very cpu consuming even on powerfull boxes.
This task imho is bit out of libreNMS scope i think better create separate system with exabgp, there is already pretty easy to setup and improve solutions like gix looking glass and etc.
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