One of the major uses of a plugin is to notify the DNS server of the IP address of the new primary manager node.
The new active manager must re-point the generic manager hostname to a new IP address by updating the record on the DNS server.
When the primary manager fails and the backup becomes the new primary manager, a ManagerHAPromotedToPrimary event will be triggered. The Sybase CEP generic plugin can be configured to respond to this event by calling a program (for example, nsupdate) that will update the DNS recordm such as nsupdates.
For more information on this topic, please consult the Sybase CEP Installation Guide .