LibreNMS has integration with PeeringDB to match up your BGP sessions with the peering exchanges you are connected to.
To enable the integration please do so within the WebUI -> Global Settings -> External Settings -> PeeringDB Integration.
Data will be collated the next time daily.sh is run or you can manually force this by running
php daily.php -f peeringdb, the initial collection is delayed for a random amount of time to avoid overloading the PeeringDB API.
Once enabled you will have an additional menu item under Routing -> PeeringDB