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
lnms config:set peeringdb.enabled true
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