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https://community.librenms.org/t/modify-discovery-protocols-inc-php-to-fix-neighbours-problem-on-extreme-networks-exos-switch/7797 The bug is caused by SNMP polling switch-1 with ifIndex to DB (associate ifIndex when adding switch), the port “1” is “1001”. Another switch-2 discover the switch-1 port “1” by LLDP is “1” (after LiberNMS get this information). Two values are not equal (“1001” != “1”). If I change to use ifName associate when adding device, because ifName is “1:1”, so it can not equal to LLDP too (“1:1” != “1”).