This read-write INTEGER selects, per its source description, the syslog facility code (such as kernel, userlevel, mail, security1/2, ftp, ntp, or one of the localuse0-7 custom facilities) attached to messages sent to the configured loghost. Admins set this to categorize this device's syslog messages under a specific facility so a centralized syslog server can filter, route, or store them separately from other devices' logs. For example, setting this to localuse4(20) would let the receiving syslog server apply a filtering rule specific to that local-use facility for messages from this device.